India Solar, Wind, Biomass, Biofuels – EAI

Harita's Blog

Expand your network

Be part of the most happening Indian renewable energy community Join EAI Club - It's FREE

Solar air conditioners, Solar AC, Solar AC in india, Solar AC Types, Cost, Market in India, Specifications and business opportunities, Solar AC cost in india,



                                                TABLE OF CONTENTS























 Solar energy has always seemed the ideal power source for air conditioning. After all, the sun is generally shining when the air conditioning load is at a maximum! However as yet they are not available at an affordable price, and most can at best be considered to be solar assisted air conditioners or solar air coolers, not solar air conditioners. We look here at the different types and their strengths and weaknesses and compare them to other energy and greenhouse gas reduction options in this blog . Courtesy



Indian students have just won the patent on Solar air Conditioner 


: A pedal operated washing machine with electric generator, a solar powered air-conditioner, a sports car prepared from the scrap of Maruti 800 and a road cleaner designed from a three-wheeler tempo. These are some of the innovations, which were displayed at Tech Expo 2014 - Gujarat's biggest exhibition-cum-competition organized by city-based Parul Group of Institutes.

In all, 350 innovative projects, most of them working models, prepared by over 1,500 budding diploma and degree engineers were displayed at Tech Expo 2014. The exhibition meant to showcase talents of engineering students was inaugurated by vice-chancellor of Gujarat Technological University Akshai Agrawal and Mo Hosni, professor of College of Engineering from United States based Kansas State University at Waghodia-based Parul campus on Friday.

A team of seven students displayed a solar powered air-conditioner, which they prepared at the cost of Rs 70,000. "This air-conditioner has solar panel batteries. The batteries get fully charged in five hours. While the air-conditioner can run full day during summers, at nights it can run for five hours at a stretch," said Brijesh Panchal, a student, adding that unlike the conventional air-conditioners, this solar powered air-conditioner can save Rs 8,000 per annum on electricity bill. "A user can recover the entire cost of this air-conditioner within four years," he said. more..

 Solar Ventilation and Air Conditioning in Retail Leasing??: New Idea

A topic that arises in virtually every retail lease, and yet is barely addressed in the letter of intent (LOI), is the heating and cooling of the demised premises.  The LOI is typically cursory:  “Landlord shall deliver the demised premises to tenant with a 15 TON HVAC system in good working order.”  Who is responsible to maintain and repair the system?  Whose obligation is it to replace the system if it can no longer be repaired?  While these are all business issues, they are most often left for the lawyers to determine during the lease negotiation.  A standard landlord clause would provide:


The property which tenant is required to maintain is the demised premises and every part thereof, including, but without limitation, all walls, floors and ceilings, the heating system, the air conditioning system, including rooftop heating and air conditioning units if the same are used ….  Tenant agrees that it will obtain and maintain in full force and effect a non-cancellable heating and air conditioning equipment service contract which shall provide for the periodic inspection and maintenance of the heating and air conditioning equipment serving the demised premises.  Said contract shall be made with a reputable contractor and shall be subject to Landlord’s approval.  Copies of said contract and any renewals and/or replacements thereof shall be delivered to Landlord.


The landlord’s lease will, generally, also provide that the obligation to “repair” includes replacement when necessary.  A tenant’s failure to negotiate these provisions may prove costly.  Generally, it is tenant’s obligation to pay for regular maintenance of HVAC units, either by maintaining the service contract mentioned or, in the event landlord maintains the units serving tenant spaces, by paying a proportionate share of landlord’s cost of such maintenance.  Replacement of an HVAC system is, however, a much more expensive proposition.  HVAC replacement is a capital expense, and so one would assume that replacement cost is landlord’s to bear.  However, most retail leases require tenant to replace the system when necessary as the tenant has had the sole use of the system during the term.  Landlords generally accept an equitable sharing of HVAC replacement cost whereby the initial expenditure is tenant’s obligation; with the unit being deemed to have a useful life of some years (for sake of this discussion, say 10 years); and landlord reimburses tenant at the end of the lease term for the remaining unamortized cost of the unit.


How will leases deal with solar and other “green” methods of heating and cooling?  Who bears the cost of installing, repairing or replacing solar panels?  The parties will need to consider rooftop or ground access and control; who has the right to install energy generation systems or other features such as skylights and who benefits from any cost savings?  In triple net leases, the capital costs of “green improvements” are most likely to be borne by landlord, yet the operational savings are enjoyed by tenant. 


Landlords have less incentive to invest in energy saving technology as the cost savings do not accrue to the investor.  As these “green” leases evolve, landlords and tenants will need to find ways to share the burden of the underlying infrastructure cost of “going green,” taking into consideration any tax credits, lower operating costs and refunds in the possible sale of power back to the grid.  Expect to see clauses like this:


On Site Electrical Generation.  In the event Landlord elects to install any on-site electricity generation system, including without limitation, photovoltaic solar panels, Landlord shall have the right to:  (i) use the electricity generated by such system in the operation of the Shopping Center, including use in the Common Areas and/or to the Premises, and (ii) include the reasonable cost of such electricity in Operating Costs.  The cost shall be determined by Landlord based upon the then-current market rates for electricity being charged by private utility providers in the area where the Shopping Center is located.




Green Credits.  Landlord shall be entitled to all tax credits, carbon credits and other such credits or entitlements (“Green Credits”) that may be created, credited or recoverable because of energy savings or other sustainability activities conducted within the Shopping Center or the Premises, excluding Green Credits to which the Tenant is entitled in accordance with applicable law.  Landlord shall be entitled to allocate, in its reasonable discretion, any Green Credits created with the participation of the Tenant and/or other tenants in the Shopping Center.


* GREE to launch solar air conditioners in india?


Chinese air conditioner and home appliances maker Gree has entered the Indian market, launching its products here today through a tie-up with Servomax.Servomax Group, a Hyderabad-based manufacturer of power engineering products with a turnover of Rs 600 crore, will be the marketing partner of Gree for the entire Indian market.

“We are breaking the market myth that Chinese goods are cheap. We are bringing in premium products that will be economically beneficial in the long run due to their power saving abilities,” Jimmy Jose, Gree India Managing Director, told said here.


Its current portfolio of offerings in the Indian market consists of residential TVs that have a price range of Rs 24,000 (three-star) to Rs 1.40 lakh (five star).


Gree has an annual manufacturing capacity of 60 million ACs in the residential sector and 5.5 million in the industrial and commercial segments.


“We see a lot of potential in the Indian market, as the current level of penetration for ACs is only three per cent. The market size is estimated at 3.5 million units per annum. We are aiming at a market share of 30 per cent within three years,” Fin, Assistant Sales Director of Gree, said.


The company has recently launched a new solar-based AC product for the Chinese residential market which it is trying to bring into India within a year. more...





The SolarAir is just like any other 3.5kw split system air conditioner, it can heat and cool, turns on and off by remote control, has a head unit that mounts on the wall inside and a refrigeration unit that sits outside. The only difference is that the SolarAir has been specially designed to connect to four solar panels that sit on your roof to power the air conditioner while the Sun is shining..MORE.. 



solar cooling can possibly become the future of air conditioning in Australia. This emergent technology may come as an answer to the prayers of both environmentalists and householders since it would not only help Australians cut back on their electricity bills but would also go a long way in reducing the greenhouse effect. MORE..



Daikin Australia has just released a new small agile reverse cycle air conditioner (that's a heater and air-conditioner all-in-one). The 3.6kW heating/2.5kW cooling FTXZ25N/RXZ25N is the highest performance heat pump air-conditioner ever offered on the Australian market and, as a direct response to the carbon tax, it uses a new low GWP (Global Warming Potential) refrigerant known as R32.more..


 *Solar Airconditioning system wins  Excellence Award

  MakatiMed won The Excellence Award at the 11th Asian Hospital  Management Award in September 2012


*Airconditioner soon to become outdated?Thanks  to Solar structure

Researchers at Stanford have designed an entirely new form of cooling structure that cools even when the sun is shining, eliminating the need for air conditioning.

Such a structure could vastly improve the daylight cooling of buildings, cars, and other structures by reflecting sunlight back into space.eplacing-air-conditioners


 The Intersolar 2012 award for the topic of Industrial and Commercial Use was presented to Clique Developments for its solar-operated air-conditioning system.  source


 *  Anu Solar's german technology to develop solar generators capable of running air conditioners

Bangalore-based Anu Solar, manufacturers of solar water heaters and energy products has partnered Germany based Smart Energysystems International AG. As part of the joint venture Anu Solar will manufacture solar generators using German technology for the Indian market at its manufacturing facility in Bangalore.source


* Solar AC using 90 % less energy.

The researcher’s name is Paolo Corrada and he is a PhD student at QUT. He said that ”heating and cooling account for about 65 per cent of energy consumption in a house, whereas cooking accounts for only 6 per cent so it is easy to see why air conditioning devices are the main targets to reduce our energy consumption.”The Green Optimistic (


*Solar AC now launched in India 

Mr Laxminarayan, Chairman, Solex Group, said the solar AC operates also on normal power supply, while taking advantage of solar energy for its efficient and economical operation. It has a small solar collector panel which can be fixed on the outside wall (not necessary on terrace). Solar AC can save up to 30 per cent electricity cost, he said.

The 0.75 tonne AC costs Rs 45,000, one tonne comes for Rs 52,000, while 1.50 tonne is priced at Rs 71,000 a unit.

Presently it is available as a window in 3 sizes. 0.75 ton, 1.00 ton and 1.50. For further information, please contact Sonali Mitra on 022 21730230 or email: solexexim@ yahoo. com

 Solar air conditioning refers to any air conditioning system that uses solar power. This can be done through solar photovoltaic conversion, solar thermal energy conversion passive solar etc.


 Note : (*) represents latest news and views





- See more at:

Books To read..

Air conditioning a practical introduction

Solar air conditioning

Evaporative air conditioning

Planning and Installing Solar thermal systems

Emerging Technology

Photovoltaic Solar Cooling 



Photovoltaic cooling uses PV panels to generate solar electricity to power an electrical cooling device. A PV system uses an inverter to convert the DC power generated by the PV panels into AC power. The AC power provides the electricity to power a conventional air conditioner. Some air conditioners can be powered directly with DC power. In those cases there isn’t need for an inverter.

PV –powered cooling has been the most frequently implemented solar cooling technology for small residential and small commercial cooling.

Since PV cooling's cost effectiveness depends largely on the cooling equipment and given the poor efficiencies in electrical cooling methods until recently it has not been cost effective without subsidies. Pairing PV with 14 SEER and less coolers is the least efficient of all solar cooling methods. Using more efficient electrical cooling methods and allowing longer payback schedules is changing that scenario.

A more efficient air conditioning system would require a smaller, less-expensive photovoltaic system. A high-quality geothermal heat pump installation can have a SEER (Seasonal Energy Efficiency Ratio) in the range of 20 ( /-). A 100,000 BTU SEER 20 air conditioner would require less than 5 kW while operating.

A less expensive partial-power photovoltaic system can reduce the monthly amount of electricity purchased from the power grid for air conditioning.

An already existing conventional vapor compression system, even if decentralized, can easily be converted to a solar-assisted system by simply adding PV cells to the internal grid. Another solar option is to directly use the DC array current and charge up a battery bank and feed a DC air conditioning system.



A PV air-conditioning system, consists of PV cells providing electrical energy to run a vapor compression system.
                                                           Solar SplitCool DC Air Conditioning

Solar SplitCool DC Air Conditioning
Some advantages of this architecture are that after the solar array power is changed to AC, through an inverter, off the shelf products can be used, even for very small systems. Excess power can easily be used in the internal grid or sold to the public grid. Decentralized systems can be used. An already existing conventional vapor compression system, even if decentralized, can easily be converted to a solar-assisted system by simply adding PV cells to the internal grid. Another solar option is to directly use the DC array current and charge up a battery bank and feed a DC air conditioning system.


Some solar test air cooling machines have used photovoltaics to run a Peltier system. A Peltier system is a solid state refrigerator, or thermoelectric cooler. Thermoelectric elements are made of semiconducting materials such as bismuth telluride and antimony telluride alloys (Bi2Te3 and Sb2Te3). Since they have neither moving parts nor refrigerant and can be made very small, they have been used in electronic chip cooling, portable refrigerators and in space applications like satellite and space ships where physical size of a cooling system is extremely limited.
COP of this system is currently very low, ranging from 0.3 to 0.6. Small thermoelectric air-conditioners with a few hundred Watt capacity are available in the market.



In this approach a solar photovoltaic array (solar cells) are connected to what is substantially a conventional air conditioner, (although typically a particularly efficient design is chosen). Because of the enormous power requirement of a conventional air conditioner, all the ones I have seen are actually only solar assist air conditioners. Based on published data, It ids estimated that generally solar power only contributes about 10-20% of the power used. (Although if an efficient approach is used the energy use might be 30% less than the energy used for a conventional air conditioner.

Advantages of this approach are:

  • Applicable in most climates

The disadvantages of this approach are:

  • The solar cells are way to expensive to provide a 100% solar powered design for a conventional home
  • Generally this is pure tokenism
  • Other greenhouse gas reduction approaches are much cheaper per tonne of CO2 saved




machine - Cooling3A Solar Thermal or solar Photovoltaic

book : adsorption-or-absorption&ei=_QcvSsD4ApzazQSS-Y2jBw&redir_esc=y#v=onepage&q=solar-cooling adsorption-or-absorption&f=false







Solar Open Loop Air Conditioner using Desiccants( Desiccant cooling)




 Desiccant cooling is a new and potentially environmentally friendly technology, which can be used to condition the internal environment of buildings without the use of traditional refrigerants. 

Unlike conventional air conditioning systems, which rely on electrical energy to drive the cooling cycle, desiccant cooling is an open heat driven cycle, which uses a desiccant wheel and thermal wheel in tandem to achieve both cooling and dehumidification. Because it is a heat driven cycle, there is the potential to utilise environmentally cleaner sources of energy such as gas, hot water, waste heat or any heat source, including solar thermal energy, able to elevate the air temperature to a level adequate for reactivation. Indirect benefits are associated with low humidity levels, including reduced corrosion and microbial growth. This makes it a very environmentally friendly technology choice if properly designed, sized and managed in use. Courtesy



Desiccant cooling systems combine sorptive dehumidification, heat recovery, evaporation and heating to create a cooling process which can offer energy savings compared to conventional air conditioning systems. Waste heat or solar energy can be used for the required regeneration of the sorbens in the dehumidifier, leading to further energy savings. Parametric studies, particularly of the dehumidifier, have been undertaken. These show that it may be possible to reduce the regeneration air flow without a significant reduction in the dehumidification efficiency, enabling desiccant cooling systems to run with high COPs. The results of the measurements were used as input parameters for a new dynamic imulation program, which was specifically developed for the purpose of assessing the potential for desiccant cooling under different climatic conditions Courtesy


Air can be passed over common, solid desiccants like silica gel or zeolite to draw moisture from the air to allow an efficient evaporative cooling cycle. The desiccant is then regenerated by using solar thermal energy to dry it out, in a cost-effective, low-energy-consumption, continuously repeating cycle. A photovoltaic system can power a low-energy air circulation fan, and a motor to slowly rotate a large disk filled with desiccant.

Warm and humid air enters the slowly rotating desiccant wheel. The air is humidified by the adsorption of water (1-2). Since the air is heated up by the adsorption heat, a heat recovery wheel is passed (2-3), resulting in a significant pre-cooling of the supply air stream. Subsequently, the air is humidified and thus further cooled by a controlled humidifier (3-4) according to the set-values of supply air temperature and humidity. The exhaust air stream of the rooms is humidified (6-7) close to the saturation point to exploit the full cooling potential in order to allow an effective heat recovery (7-8). Finally, the sorption wheel has to be regenerated (9-10) by applying heat in a comparatively low temperature range from 50 °C-75 °C and to allow a continuous operation of the dehumidification process. 

utilises liquid or solid desiccant material to dehumidify air.  After dehumidification the air is sufficiently dry to enable an evaporative cooling process to cool air well below ambient temperature conditions. This air is then supplied directly to the building. This is an open cycle process where the cooling process utilises water as the refrigerant and air as the delivery media.

While there are relatively few suppliers of these systems, desiccant cooling systems have been used extensively in certain niche applications (e.g. supermarkets) where the ability to independently control air humidity provides additional benefits.Courtesy










Passive Solar Cooling:

In this type of cooling solar thermal energy is not used directly to create a cold environment or drive any direct cooling processes. Instead, solar building design aims at slowing the rate of heat transfer into a building in the summer, and improving the removal of unwanted heat. It involves a good understanding of the mechanisms of heat transfer: heat conduction, convective heat transfer, and thermal radiation, the latter primarily from the sun.

Passive solar cooling is much easier to achieve in new construction than by adapting existing buildings. There are many design specifics involved in passive solar cooling. It is a primary element of designing a zero energy building in a hot climate.


Passive solar home design

In simple terms, a passive solar home collects heat as the sun shines through south-facing windows and retains it in materials that store heat, known as thermal mass. The share of the home’s heating load that the passive solar design can meet is called the passive solar fraction, and depends on the area of glazing and the amount of thermal mass. The ideal ratio of thermal mass to glazing varies by climate. Well-designed passive solar homes also provide daylight all year and comfort during the cooling season through the use of nighttime ventilation.

To be successful, a passive solar home design must include some basic elements that work together:

  • Properly oriented windows. Typically, windows or other devices that collect solar energy should face within 30 degrees of true south and should not be shaded during the heating season by other buildings or trees from 9 a.m. to 3 p.m. each day. During the spring, fall, and cooling season, the windows should be shaded to avoid overheating.
  • Thermal mass. Thermal mass in a passive solar home -- commonly concrete, brick, stone, and tile -- absorbs heat from sunlight during the heating season and absorbs heat from warm air in the house during the cooling season. Other thermal mass materials such as water and phase change products are more efficient at storing heat, but masonry has the advantage of doing double duty as a structural and/or finish material. In well-insulated homes in moderate climates, the thermal mass inherent in home furnishings and drywall may be sufficient, eliminating the need for additional thermal storage materials.
  • Distribution mechanisms. Solar heat is transferred from where it is collected and stored to different areas of the house by conduction, convection, and radiation. In some homes, small fans and blowers help distribute heat. Conduction occurs when heat moves between two objects that are in direct contact with each other, such as when a sun-heated floor warms your bare feet. Convection is heat transfer through a fluid such as air or water, and passive solar homes often use convection to move air from warmer areas -- a sunspace, for example -- into the rest of the house. Radiation is what you feel when you stand next to a wood stove or a sunny window and feel its warmth on your skin. Darker colors absorb more heat than lighter colors, and are a better choice for thermal mass in passive solar homes.
  • Control strategies. Properly sized roof overhangs can provide shade to vertical south windows during summer months. Other control approaches include electronic sensing devices, such as a differential thermostat that signals a fan to turn on; operable vents and dampers that allow or restrict heat flow; low-emissivity blinds; operable insulating shutters; and awnings. Courtesy

Now that summer's swelter is in full swing, notice how much heat is radiating into your home from those enormous south-facing windows? Do you long for the tantalizing shade of a forest grove? Worried about how much your utility is going to charge you next month, as your air conditioner chugs away with the regularity of a freight train? True, it may be too late to make substantial changes to your dwelling in order to combat the oppressive heat of this season. But that doesn't mean you can't observe and learn for the future, or start planning now for your next renovation or improvement project. By maximizing some common sense applications of what's called passive heating and cooling, you can take advantage of the natural heat storage and flow of the materials in and around your home.


  • Get in Line with the Sun While you can't exactly rotate your whole house through the day like a lizard sunning itself on a rock, you can try to plan your building's orientation in the first place. Spend some time on the site before you break ground, and you can design so summer's harshest rays are mitigated, while the winter sun is welcomed into windows and onto heat-absorbing walls.
  • Choose Colors Wisely You wouldn't wear a black suit to a summer parade, would you? If you live in a hot climate, think light colors for exteriors (including the roof), as well as walls and window coverings. Interior paints matter, too.
  • Plant Your Way to Shade Not only does vegetation improve your home's value (and carbon footprint), but give some thought to species selection. Deciduous plants are great in temperate climes, because they shield sunlight in summer and allow it in during winter.
  • Awnings and Overhangs Aren't Just for Stores Since the sun travels across the sky in predictable arcs, proper depth and placement of awnings and overhangs (as well as inset windows) can work wonders by blocking summer's near vertical solar rays, while letting in the low-angle rays of winter. The farther north you are, the bigger the awning should generally be, since there will be greater variation in seasonal light. Also consider glass with low-emittance (low-E) coating, which reduces heat transfer.
  • Punch Holes in Walls No, don't just unleash on your room with a sledgehammer, as frustrating as stuffy heat may be. But you can install vents in high spaces that allow hot air to escape, while low ducts can pull in cooler air. If you''re ambitious, you can build a cooling tower, which takes advantage of the heat gradient on a larger scale to provide substantial cooling. Think these techniques aren't worth the trouble? According to the U.S. Department of Energy, such passive solar design can cut heating bills by as much as 50 percent.


Passive Solar Cooling

 Ventilation & Operable Windows

A primary strategy for cooling buildings without mechanical assistance (passive cooling) in hot humid climates is to employ natural ventilation. (The Fan and Landscape sections also address ventilation strategies.) In the Austin area, prevailing summer breezes are from the south and southeast. This matches nicely with the increased glazing on the south side needed for passive heating, making it possible to achieve helpful solar gain and ventilation with the following strategies:

  • Place operable windows on the south exposure.
  • Casement windows offer the best airflow. Awning (or hopper) windows should be fully opened or air will be directed to ceiling. Awning windows offer the best rain protection and perform better than double hung windows.
  • If a room can have windows on only one side, use two widely spaced windows instead of one window.

 Wing Walls

Wing walls are vertical solid panels placed alongside of windows perpendicular to the wall on the windward side of the house.


Top View of Wing Walls Airflow Pattern

Wing walls will accelerate the natural wind speed due to pressure differences created by the wing wall.

 Thermal Chimney

A thermal chimney employs convective currents to draw air out of a building. By creating a warm or hot zone with an exterior exhaust outlet, air can be drawn into the house ventilating the structure.

Sunrooms can be designed to perform this function. The excessive heat generated in a south facing sunroom during the summer can be vented at the top. With the connecting lower vents to the living space open along with windows on the north side, air is drawn through the living space to be exhausted through the sunroom upper vents. (The upper vents from the sunroom to the living space and any side operable windows must be closed and the thermal mass wall in the sunroom must be shaded.)

                                                      Summer Venting Sunroom

Summer Venting Sunroom

                                                     Summer Venting Thermal Mass Wall

Summer Venting Thermal Mass Wall

Thermal mass indirect gain walls can be made to function similarly except that the mass wall should be insulated on the inside when performing this function.

                                                     Thermal Chimney

Thermal Chimney

Thermal chimneys can be constructed in a narrow configuration (like a chimney) with an easily heated black metal absorber on the inside behind a glazed front that can reach high temperatures and be insulated from the house. The chimney must terminate above the roof level. A rotating metal scoop at the top which opens opposite the wind will allow heated air to exhaust without being overcome by the prevailing wind.

Thermal chimney effects can be integrated into the house with open stairwells and atria. (This approach can be an aesthetic plus to the home as well.)

 Other Ventilation Strategies

  • Make the outlet openings slightly larger than the inlet openings.
  • Place the inlets at low to medium heights to provide airflow at occupant levels in the room.


Thermal Chimney Effect Built into Home

Inlets close to a wall result in air “washing” along the wall. Be certain to have centrally located inlets for air movement in the center areas of the room.

Window insect screens decrease the velocity of slow breezes more than stronger breezes (60% decrease at 1.5 mph, 28% decrease at 6 mph). Screening a porch will not reduce air speeds as much as screening the windows.

Night ventilation of a home should be done at a ventilation rate of 30 air changes per hour or greater. Mechanical ventilation will usually be required to achieve this (See Fan Section).

High mass houses can be cooled with night ventilation providing that fabric furnishings are minimized in the house.

Keep a high mass house closed during the day and opened at night.

Watch Video





book:passive cooling of buildings



 Solar Air Conditioner manufacturers in the world

 Solair world australia









Solar Air Conditioner manufactuers in India:

Surya Shakti: Manufacturers of solar air conditioners, solar water heaters and many other solar products.

Dr Upendra Kamdar, founder of Suryashakti Systems came up with air conditioning unit that is powered in part by direct solar heat. Because units often have to fit into limited space, the systems are small because solar PV panels and batteries are not needed.

The patented hybrid system works by using solar thermal energy to further expand the refrigerant coming out of the compressor, thus reducing the compressor load and saving electricity consumed by the system. Heat is absorbed from the atmosphere and also from hot air exiting from the air conditioning system, which is usually discarded as waste heat. As there are heat storage facilities available in the system, it works during night time as well and provides 48 to 72 hours back-up during cloudy days.  The system can be effective in saving electricity consumption by up to 50% when compared to conventional air-conditioners.


First Esco India Pvt Ltd: Manufacturers of solar air conditioning unit, solar parabolic trough collectors, Solar-wind hybrid power packs etc. Solar parabolic trough collectors provide the heat for absorption chillers. Availability of plant 5TR to 5000TR. Thermal storage is possible in this system. 5TR to 5000TR solar air conditioning plants are available.

Arka Technologies: Manufacturers of solar photovoltaic products, solar thermal products, wind energy products etc. Arka Technologies offers solar air conditioning system based on absorption cooling system.

Sharada inventions: Manufacturers of solar photovoltaic, solar thermal products etc. Intensive research at Sharada inventions brings unique revolutionary concept in the world of air conditioning. Sharada inventions offer solar air conditioning system based on high COP absorption cooling systems. The system does not have compressor and it is free from ozone depleting CFC.

Onyx: Onyx is India's largest solar air-conditioning company. Onyx primarily focuses on the corporate and commercial markets.


International Manufacturers of Solar Air Conditioners:

Haining Longfei Collector Tube Co., Ltd: Manufacturers of solar collectors, solar water heaters, solar air conditioners, solar collector tubes, solar heat collectors etc.

Chuanglan: Chuanglan Solar Air Conditioner Co., Ltd., subsidiary of Menglan Group, is the pioneer in the field of renewable energy exploitation and utilization, and it has been devoting on the development, production and sales on solar energy products, energy-saving products and healthy products for nearly a decade. Manufacturers of solar air conditioners, solar heaters etc.

LG electronics: LG electronics announced the debut of the first eco-friendly solar hybrid air conditioner in Korea. This product provides upto 70 watts of power per hour via solar cell modules attached to the top of this outdoor unit. According to the Korean manufacturer, this new hybrid system is capable of reducing around 212Kg of Co2 over 10 years.

Solar panels plus: Solar powered air conditioning systems are available in sizes ranging from 5tons to 100's of tons. Solar powered air conditioning systems are based on time tested absorption chillers.






Technical Specifications of solar air conditioner:

Sample technical specifications of solar air conditioner from Atlantis Solar:

Specification of SK-1W & 1.5W Split Wall Solar Air Conditioner:

Heating is optional

Power Supply

Split Wall

Split Wall

















19000 1700



5700 500









Air circulation




Suitable Area









Input Power








1130-1360 500W

Rated Current










Indoor Unit









Outdoor Unit










Indoor Unit





Outdoor Unit

















For specifications of other types of solar air conditioners:






Buy Solar air conditioners


Solar air conditioners are being marketed online at






*Securus - Direct current Solar Air conditioning

 Direct current, solar air conditioning systems are now available from 3600 BTU to 18000 BTU and can operate day and night directly from wind, solar PV and hydro with a battery bank. The 100% DC cooling systems range from a quarter to 1.5 Ton and are effective up to 800 square feet. All of the sustainable AC systems are powered by any renewable energy source are ideal for cooling electronics, off-grid applications, high energy cost environments and add-on/augmentation. Renewable climate control is the best way to ensure sustainable, safe comfort for the entire planet.

One reason that the 48 volt air conditioner makes the best use of solar power is because there are no losses associated with converting DC power from solar, wind and or hydro to charge the deep cell batteries that power the Securus system.  Solar Air Conditioning Is Priceless. The Securus systems save energy 24/7 and continue to run off batteries during blackouts saving loved ones, pets, electronics and valuables.



An Australian Solar Airconditioning company. Read more about them



*Atlantis Solar 



it uses solar thermal energy, secondly, it uses a highly efficient heat

exchanger storage system for a certain amount of solar energy added, for our solar air conditioner to work, and through this system is

effective matching, it greatly reduces energy loss of the compressor; our intelligent solar air conditioning control system can

automatically guarantee most of the normal energy supply of the solar collector system. Secondly, the use of the thread pipe,

hydrophilic trunk, is the most optimized heat exchanger matching system that reduces energy loss and improves the overall efficiency

and effective guarantee of the end working results, no ordinary air-conditioner saves more than our Atlantis Solar air-conditioner

You can read the technical specs at






A wide range of ICE Solair solar air conditioners are available to address you commercial and domestic needs. All systems are reverse cycle and are manufactured to the highest international standard. All products utilise the unique energy saving process to achieve the typical 30 - 50% energy savings.

Types of systems available :

  • Wall mounted;
  • Slim Line; and
  • Cassette.

For each type, there is a wide range of outlet (head) capacities available for use. Each system is a dual head system to minimise floor space utilisation and keep installation costs down. Each head unit can be operated independently.


All ICE Solair solar air conditioning systems must be installed by licensed installers that have completed the ICE Solair training. Your agent can assist you with finding your nearest qualified installer.

Rust Protection

Rust protection measures are available as an optional extra. Please ask your dealer for details.


ICE Solair extends a 3 year (Domestic) and 1 year (commercial) Parts and Labour Warranty and applies to all our products purchased and installed in Australia or New Zealand. Installation must be completed by an approved ICE Solair installer and maintained in accordance with the preventative maintenance agreement.

Extended warranty of 5 (domestic) and 3 (commercial) years is available. Please ask your dealer for details.

NOTE: Laboratory test results provided by the manufacturer indicate energy savings of up to 30 – 50% based on comparisons of equivalent type non - solar air conditioning systems. Our investigations and testing indicate that these claims appear valid.


Given every installation is unique, please contact our talented staff at ICE Solair to arrange for a quote.

Solar air conditioning specification sheets


Other technology the company is developing/distributing




*FAQ - Solar Airconditioner - IceSolar


Q. How does the system work?

A. ICE Solair is a normal split system air conditioner that has been modified so that a flat plate collector captures thermal energy from the ambient temperature to optimise the efficiency of the outdoor unit (condenser).


Q. Does the collector generate power, or how much power does the panel generate?

A. The collector does not generate power, it absorbs and stores ambient temperature, which is then used to extend the duration that the compressor shuts off once once the desired room temperature is reached.


Q. How does the collector assist in improving the efficiency of the air conditioner?

A. The heat captured &/or stored in the collector is used to heat and expand the refrigerant. This reduces the amount of work that the compressor (within the condenser) has to do. Substantial energy savings are achieved when the room achieves the desired temperature and the condenser turns off. The condenser will remain off considerably longer due to the collector continuing to pressurise the refrigerant.


Q. Does the collector have to go on the roof?

A. No. It is mounted on the wall beside the outdoor unit within approximately 0.5m.


Q. Does the collector have to be in direct sunlight?

A. No, it is designed to function in ambient temperature. The temperature range is between -5 and 50 ̊ C. Please note that the more heat the collector is exposed to, the greater the efficiency.


Q. Why is it called Solar if it is not in direct sunlight?

A. The ambient temperature absorbed by the panel is from sunlight.


Q. Can I on sell them?

A. Yes, if you are certified by ICE Solair as a wholesaler or distribution.


Q. Can I install one in my own home or office?

A. Yes. Remember to have all of your installations done by a Certified ICE Solair installer.


Q. Do you sell multi-head systems?

A. Yes.


Q. Can the head units be operated individually?

A. Yes, each head unit has its own remote and as such can be operated independent of each other.


Q. What is the warranty?

A. Solair extends a 1 year Parts and Labour Warranty and applies to all our products purchased and installed in Australia or New Zealand. Installations must be completed by an approved Solair installer. Extended warranty for up to 5 years can be purchased.








*1 Solar Heating and Cooling  Roadmap,  2 Calculate Solar Output, 4 Assessing the Life Cycle of a Solar Heating Cooling System 


Information on all the above from IEA, click here



*It is not grid tied, But an interesting concept in DIY solar airconditioner.


Cost and Subsidies for Air conditioner





Solar Closed Loop Absorption & Adsorption Cooling:


Ammonia/Water, Water/Lithium Bromide, Water/Lithium Chloride are the most common technologies used for solar closed loop absorption cooling and Water/Silica Gel or Water/Zeolite and Methanol/Activated Carbon are the most common technologies used for solar closed loop adsorption cooling.


Active solar cooling uses solar thermal collectors to provide thermal energy to drive thermally driven chillers usually absorption or adsorption chillers. The concentrating solar thermal collector provides solar thermal heat by concentrating the sun’s energy on a collection tube and heating the recirculated heat transfer fluid within the system. The generated heat is then used in conjuction with absorption chillers to provide a renewable source of industrial cooling.


Efficient absorption chillers require water of at least 190 °F (88 °C). Common, inexpensive flat-plate solar thermal collectors only produce about 160 °F (71 °C) water. In large scale installations there are several projects successful both technical and economical in operation worldwide.






Hybrid solar air conditioning:


Hybrid solar air conditioning uses solar energy to assist a high efficiency compressor to reduce energy use dramatically. It consists of an compressor and an air handler and a solar thermal collector mounted on the roof.


The Hybrid Solar Air Conditioning system takes a high efficiency 16 SEER compressor adapted to circulate refrigerant to the solar collector. The solar collector, made of evacuated glass tubes, superheats the refrigerant, making the job of the compressor easier, and thereby reducing energy use.




In a hybrid solar air conditioning system, a solar collector is placed between the compessor and the condensing coils. The compressor pressurizes and heat the refrigerant. A hybrid solar  air conditioning system uses a highly efficient vacuum tube collector filled with an organic liquid product. The collector heats the organic substance to over 350 degrees using the solar energy  to superheat the refrigerant above what the compressor would be able to heat it with electricity. The resulting efficiency derived from the solar collector allows for the refrigerant to work more efficiently with no additional moving parts or motors. This increases the ability of the gas to change back into a liquid much quicker and dramatically reduces the energy requirement of the compressor.  The gas now condenses back into saturated gas in the first third of the condensing coil not the final third. Therefore by the time the refrigerant reaches the expansion devise in the inside coil, it is already almost a liquid.  This allows the near liquid refrigerant to be more efficient at absorbing heat, making it 5-6 degrees cooler in the inside coil, delivering colder, drier air to the building.





Passive heating based on harnessing solar rays is a common strategy used to warm structures in winter, but what about passive cooling? This seemingly contradictory term has been used in reference to removing heat via ventilation or slowing down heat transfer—not directly cooling, per se, which has seemed like an insurmountable challenge.

A team of researchers at Stanford University has found the secret to passive solar cooling, however, based on the use of nanostructured photonic materials. The new radiative cooling technologytakes advantage of these materials' ability to limit the absorption of heat while harvesting energy from sunlight. Moreover, these materials are tuned to reflect the specific solar wavelength capable of escaping the Earth's atmosphere back into space—thus avoiding the greenhouse effect.

“No one had yet been able to surmount the challenges of daytime radiative cooling—of cooling when the sun is shining,” said PhD candidate Eden Rephaeli in a university press release. “It’s a big hurdle.”

In their prototype solar cooling panel, the scientists combined a solar reflector and thermal emitter in a single device, which they found to increase both performance and durability. The technology is already competitive with conventional solar panels rated at 10 percent efficiency, and is capable of reducing the cooling needs of a typical one-story single family residence by 35 percent, with only 10 percent roof coverage.

If scaled to commercial production, radiative cooling has far-reaching implications, based on its ability to provide effective cooling without electricity. In addition to a significant global reduction in energy consumption, the research team anticipates the ability to enhance the lives of populations in hot climates without access to electricity. According to Stanford professor and project leader Shanhui Fan, "we can foresee applications for radiative cooling in off-the-grid areas of the developing world where air conditioning is not even possible at this time. There are large numbers of people who could benefit from such systems."Courtesy :architect mag





Read more news items on: Solar Energy

Add to My Greenfolio

Like Leave a comment (17)

1 Member(s) Added this Post to GreenFolio

See full profile


  • shankar
    shankar -

    Nice one Harita. Thanks to Aathmika and you, we have loads of information here.

  • vijaychakrawar
    vijaychakrawar -

    Thank for your valuable information. Its much useful for me, Anybody from our society write about DPR of PV & CSP  for 5 MW capacity . Also for residential purpose from 2kw to 5 kw Solar photovoltaic.power plant.

  • Nitin
    Nitin -

    Thanks to Harita, Aa thmika, nithya, Sdesai, Shankar, Dr Bharani, Vijaychakrawar, etc
    They are all providing  lots  of relevant information, news and discussions.

    As Vijaychakrawar if somene can provide DPRs for various capacities it will be good.
    Even if it is at some reasoonable price.

    i need more opportunities mentioned.

  • Nikoli
    Nikoli -

    Is there a market for converting old refrigerators as solar refrigerators to be sold to the rural masses ? 

    Many of the rural masses do not have electricity. Can it be an off grid product ?


  • dheen
    dheen -

    The sun powered air conditioning system being developed by Siemens Corporate Technology
    has a light collection system, capturing heat from sun and a pv unit that acts as the
    power supply.



    The sun powered air conditioning system being developed by Siemens Corporate Technology has a light collection system, capturing  heat from sun and a pv  unit that acts as the power supply.

    SIEMENS researchers in Bangalore, India, are working on an air conditioning system which is entirely powered using photovoltaics.

    The standalone refrigeration system will hopefully reduce the amount of electricity consumed by air conditioning in India, where about 60 percent of electrical consumption in office buildings stems from air conditioning.

    The system being developed by Siemens Corporate Technology consists of a light collection system, which captures heat from the sun, and a photovoltaic unit that acts as the power supply.

    The device will be installed on the roof of the Siemens building in Bangalore at the beginning of 2012.                                                      

    The basis of this device is the principle of the absorption refrigerator, which uses a salt solution, with water serving as the coolant. The collected solar energy heats up the water-salt mixture and separates the water by evaporation. The water is then condensed and pumped into a vaporiser, which cools the system.

    The vaporiser is a partial vacuum inside, so even the low outside temperatures are high enough to evaporate the water. Heat is drawn in from the surroundings and the room is cooled. 

    The water vapour is then once again returned to the salt solution. Because the system constitutes a cycle, the surroundings are constantly cooled. Electricity from the photovoltaic unit is used to pump the water and the salt solution through the system.


  • harita
    harita -

    Gurgaon witnessed the inauguration of worlds most efficient solar thermal cooling system at the Solar Energy Centre on 1st July.

    The new 100 kw Solar Air-Conditioning System works at 30% higher efficiency than the current available systems. This solar air conditioning system has several unique features. It is based on the new triple effect absorption cooling technology. The system has indigenously built medium temperature high efficiency parabolic troughs for collection of solar energy and effective solar thermal energy storage in the form of Phase Change Materials. Like

  • vaibhavg
    vaibhavg -

    We are a 29 yr old manufacturing firm planning to venture into solar products. Would welcome if any one can give us an idea about the machinery and investment for setting up solar air conditioners , solar micro invertors etc.maharishi udyogarunafabs pvt ltd

    kindly mail us at 426 46 Like

  • amsapna
    amsapna -

    Thermax has designed and commissioned a first-of-a kind solar air conditioning system at the Solar Energy Centre in Gurgaon, Haryana. The 100 kw technology demonstration project was recently inaugurated by Dr. Farooq Abdullah, Union Minister for New and Renewable Energy (MNRE), in the presence of Shri Sushilkumar Shinde, Union Minister of Power. 
    In this innovative installation, for the first time in the world, Thermax has integrated a triple effect chiller and solar parabolic concentrators (collectors), both indigenously developed by the company. While conventional solar systems take up a large area for limited cooling output, the Thermax project through in-house R&D has achieved a significant space reduction of nearly 30% and a 20% increase in cooling efficiency. This has brought down cost and moved the project closer to commercialisation.  
    Speaking about the national relevance of the project, partly funded by MNRE, M S Unnikrishnan, Managing Director & CEO of Thermax said, A growing India will consume 35% of its entire electricity generated only for cooling and air conditioning. So it makes immense sense to use solar energy as a source for cooling, and reduce the use of fossil fuel.

    The solar cooling systems operating in various countries including India use low and medium temperature solar collectors with single or double effect absorption chillers that work on heat instead of electricity. The solar collectors in the Thermax system have been designed to harness sun's energy in an effective manner to provide temperatures from 140 C to 210 C. They are effectively integrated with a newly designed triple effect chiller. Offering the highest COP (coefficient of performance) in global markets today, the new chiller offers a technological breakthrough for solar applications. 
    This solar cooling solution can soon find applications across shopping malls, commercial complexes, office buildings, hospitals and industrial cooling requirements for project sizes ranging from 100 KW to 3000 KW. The fact that the availability of sun's energy during day-time matches the cooling requirements of commercial establishments makes this application practical and promising. The project can lead the way in substantially reducing the load on the national power grid.
    The company has developed its indigenous solar parabolic concentrators through collaborative application research with a host of eminent agencies Advanced Research Centre for Power Metallurgy and New materials (ARCI), IIT Kanpur, and Fraunhofer Institute from Germany. The system can also be operated on with natural gas to provide continuous cooling during non-sunny hours. This fast track project has been successfully completed within fifteen months and Thermax would also take care of the operation and maintenance of the installation over the next five years. 
    The new installation offers an environment-friendly way of cooling for the growing urban India with its residential-commercial complexes.  Besides solar energy, absorption chillers offer the cleanest form of air conditioning as it uses water as a refrigerant, as against conventional electrical systems that use not so eco-friendly variants. Thermax is the market leader of this technology in India and has several prestigious installations around the world. 
    This solar cooling project reflects the government's conviction that it is necessary to develop, in addition to solar based power generation technologies, other green energy applications, independent of the grid.  With an effective government policy framework for support, the successful commissioning of this project is expected to pave way for more such projects across the country. 

  • Nithya
    Nithya - Like

  • solar1234
    solar1234 -

    I have seen Chinese Solar Air conditioners. The Mechanism is complicated and Solar Air conditioning is expensive. When regular Air conditioning systems are available at a much cheaper price with reliability who will go for Solar Air Conditioning? It is reliability that matters more than the cost. We have seen the fate of Solar Pumps.

    Dr.A.Jagadeesh  Nellore(AP),India
    Wind Energy Expert
    E-mail: Like

  • harita
    harita -

    Solar Air Conditioning System

    Yes! We offer quality SOLAR AIR CONDITIONING SYSTEM based on absorption cooling systems.

    Outcome of intensive research brings a unique revolutionary concept in the world of Air Conditioning. The novel feature of our system is that it does not have compressor and it is free from Ozone depleting CFC.

    Solar Air Conditioning system is based on Solar Energy, which is FREE forever, resulting in tremendous savings of electricity bills. Solar Air-Conditioning System are currently available for large-scale centralized applications, with capacities of 60 TR and above. In near future the Solar Air Conditioning System (SACS) will be introduced for household applications.

    • Environmentally Friendly - Conventional Air Conditioners and refrigerators use a lot of electricity, or in the case of absorption cooling system, gas or some other combustible liquid. Reducing the consumption of these Energy sources, means less greenhouse gas production. Also non CFC based functioning of SACS makes it eco-friendly by preventing depletion of Ozone layer.
    • Flexibility - By using heat exchangers, and in particular heat pipe style heat exchangers, liquids (e.g. refrigeration fluid) can be heated to high temperatures.
    • Economic Saving - Reduce electricity bills by using Solar Energy to run Air Conditioners, refrigerators and Freezers, provide central heating (Radiative or Air), Cool water for drinking and supply hot water.
    • Suits Large Scale Applications - Solar powered Air-Conditioning and refrigeration is ideal for hotels, supermarkets, schools, factories, and large office premises etc.
    • Practical - When do you need Air-Conditioning? Summer. When is the sun shining the strongest? Summer. Throughout the year, solar thermal output and thus Air Conditioning output, match building cooling requirements.


    • Novel concept of using Solar Thermal Energy for Air Conditioners
    • No CFC, 100% Eco Friendly design an Effective step to protect Ozone depletion.
    • No moving parts, No compressor, hence no costly maintenance and "Silent"
    • Operates above 93% COP.
    • Sub-zero temperature possible.
    • Wide range of capacities varies from 60TR to 600 TR and even above.
    • Large parabolic Solar Concentrator offers most efficient output.
    • Centrally controlled automatic Sun Tracking mechanism.
    • Extended period of operations possible even after Sunny hours.
    • Do not require highly qualified personnel to maintain the system.
    • Attractive and Elegant FCU's.
    • True RH control for most comfortable environment.
    • Simple Design
    • Multiple Utilities Generated using a Single System : Ammonia/Water
    • Very Low Operating Costs : chilled and hot water circulation pumps along with the FCU power consumption will be same as that of conventional vapour compression air conditioning systems, the ammonia solution pump will consume less than 1/20th of the power consumed by the compressor of a conventional vapour compression system thus cutting the operating costs.
    • Low Maintenance Costs : It has very few moving parts. SACS has a diaphragm solution pump instead of a compressor.
    • During Non-Sunny days LPG can be used as backup energy source.

    Benefits :

    • No compressor hence 100% saving on Electricity bills towards largest power consuming component i.e. Compressor
    • No need to have additional system for Hot Water Generation. Which results in saving on capital investment as well as on running cost.
    • Free cool drinking water approx 1,500 Ltrs. Per Day @18°C
    • Pay back period works out to be less than three years.
    • 100% depreciation in 1 year itself under section 32 of income tax Act 1956.
    • Subsidy from MNRE on Solar System.
    • User can be eligible for getting World recognized Eco-friendly awards and carbon credits.
    • Can easily be configured to existing system with quick change over mode.

    Impact on energy usage

    • Up to 75% saving in Primary Energy Usage for Air Conditioning, while about 90% energy consumed by the compressor will be saved, the FCU fans, chilled and hot water pumps will consume the same power as the conventional vapour compression chiller based air conditioning systems.
    • 100% Saving in Primary Energy Usage for Hot Water Generation entire heat supplied by the solar Concentrator to the Ammonia/Water Absorption Heat Pump will be recovered in the form of hot water at 50 to 55°c
    • Lower Solar Concentrator Area : multiple use of heat collected by the high temperature Solar Concentrator helps reduce the total Collector area required using separate Solar chilling and water heating systems.
    • Environment Friendly Technology reduced primary energy consumption will help reduces CO2 emissions and Global Warming.
    • Environment Friendly Refrigerant NH3 is a ozone friendly natural refrigerant
    This offer is from

    To get to know the cost of solar airconditiner or the price of solar air conditioner in India, you can contact 
    +91 9970012300
    +91 98230 81757

    Headway solar is a solar projects consulting company.
    They seem to have gotten into manufacturing solar airconditioners in Gujarat.
    They may not have much manufacturing nor airconditioning experience.

    In solar air conditioning both may not be much required - atleast in what Headway solar is offering. The buyer just needs to ensure that they maintain the system for several years after it is purchased.

    Solar Cooling, Refrigeration and Air-Conditioning products and Solutions Hybrid Solar Air Conditioning

    Offering the first of its kind in India, Hybrid Solar Air Conditioning is an innovative technology that will reduce your energy costs tremendously. Our system uses a roof mounted solar thermal collector panel to assist a high-efficiency compressor. By using the power of the sun, we can significantly reduce your electrical consumption. Hybrid Solar Air Conditioners are ideally suited for Indian climatic Conditions and offer 30-40% savings in power consumption.

    Solar PV Air Conditioning

    The PV solar air conditioner uses a hermetically sealed permanent magnet brushless DC compressor for maximum service life. Specially designed controls and a digital frequency driver send power to the compressor using alternating pulses of DC current at a rate between 25 Hz and 125 Hz, depending on requirements, matching the compressor capacity to the operating conditions. By contrast, a normal air conditioner with a fixed capacity must run at a steady 50/60 Hz AC and must continually turn itself on and off to satisfy the thermostat, wasting energy.

    Absorption Chillers

    Sunlight is reflected and focused on narrow water pipes running throughout the thermal collector, which raises the water temperature. This hot water is used to: 1) Power revolutionary solar air-conditioning through the use of a 5-ton to 1500-ton absorption chiller during summers.
    2) Generate hot air for heating needs during winters.
    3) Hot Water all the year round.
    Except for a few pumps, the system is entirely passive, has no moving parts and requires no electrical input.

    To get the price list of solar airconditioners, the price  list or cost of solar air conditioners with a clear contract for years of maintenence products[@]

    What is Solar Air Conditioning?
      Solar air conditioning refers to an air conditioning (cooling) system that uses solar power, power from the heat obtained from Sun’s rays.
      Solar Air conditioning can be done through the generation of electricity using steam turbines or photovoltaic conversions, solar thermal energy conversion using adsoption and absorption systems, or using dessicants like sodium chloride. The specific method used varies based on each individual project needs.

    we would be employing ad/absorption and dessicant methods of direct direct conversions of Solar Heat to Cooling energy.

    We will not be using Turbines or Photovoltaic solutons, as the Expenses for producing electrical power for running conventional A/C would be two to three times more expensive, compared to the ad/absorption and dessicant methods used by us.
      Details of the different air conditioning systems
    1. Solar thermal power generation:
      A highly curved mirror called a parabolic trough or a system of mirrors called heliostats reflect sunlight and focus it on a pipe, making it so hot that it can boil water into steam. That steam is then used to run a turbine to make electricity. This electricity is used to run the air conditioners.
    2. Photovoltaic conversion to electricity:
      Sunlight can be directly converted to electricity using photovoltaic (PV) cells. PV cells are made of semiconductor material; absorb a certain portion of energy when sunlight strikes them. The absorbed energy knocks electrons loose, allowing them to flow freely. The cells have one or more electric fields that act to force electrons freed by light absorption to flow in a certain direction. This flow of electrons is a current is collected placing metal contacts on the top and bottom of the PV cell.

      These individual PV cells are arranged together in a PV module and the modules are grouped together in an array. Some of the arrays are set on special tracking devices to follow sunlight all day long. The electrical energy from solar cells can then be used directly for powering the air conditioners.
    3. Adsorption and Absorption systems using Solar energy:
      The principle behind (solar) thermal driven cooling is the thermo-chemical process of sorption. A liquid or gaseous substance is either attached to a solid, porous material (adsorption) or is taken in by a liquid or solid material (absorption). The sorbent (like silica gel) is provided with heat (i.e. from a solar heater) and is dehumidified.

      The concept of a thermal driven cooling (Ab/ad sorption) process is graphically given in figure 4.

      Schematics of solar air conditioning and the different circuits used
      • Solar heat will be used to produce steam/ hot water as a first step. This circuit is shown in Blue colour. This is a closed loop. Same water is circulated. There is no external electrical heat used.
      • The steam passes through the absorption chiller, loses its heat to the Refrigerant (Lithium Bromide/Water solution) and returns to the tank for recirculation again.
      • Refrigerant ( Shown in Orange takes the heat from the steam and using the adsorption cycle explained in the write up, produces chilled water from the second loop of water entering the Absorption chiller.( Shown in Green.)
      • The chilled water passes through the Heat exchanger, and cools the air to the required temperature, that in turn cools the target room.
      • The chilled water stored in the tank is increased to continue cooling during the hours when the sun is not shining. It also acts as the buffer for the times when the cloud or other factors affect the amount of heat from the sun.

      Click here to view large image

    4. Cooling with usage of dessicants like Sodium Chloride:
      Desiccant systems are used for direct air treatment, using a combination of dehumidification and evaporative cooling. The concept is shown below.
      Different solutions are used for each installation, depending on the local conditions. Solar powered air conditioning plants installed by them are operational in Germany and other parts of Europe. (Shown below)

    Onyx claims to be an energy saver hybrid air conditioner

    Why Hybrid Solar air conditioner Can SAVE electricity ?

    Here are the reasons.....

    Firstly it absorbs solar energy to heat the inside medium by using a vacuum solar collector. The refrigerant from the compressor goes through the copper coil inside the collector and undertakes a heat exchange. The refrigerant exchanges heat with the medium inside. The solar collector will go through a cycle inside the system for cooling and heating.

    Secondly, it adapts a highly efficient heat-exchange system. The use of the internal thread pipe, hydrophilic aluminum fin and the optimal heat exchange system reduce energy loss, improve the overall efficiency and effectively ensure the performance. There, hybrid solar air conditioner is more convenient and energy saving than regular air conditioner.

    Compare to current Products.....

    1. Conventional air conditioner consumes to much, users have to pay a heavy electricity bill.
    2. Photovoltaic (PV) system costs a large amount of money to build up.
    3. Thermally driven absorption cooling is also very costly, and its cooling capacity is not enough.

    The differences between our solar air conditioner and conventional Air Conditioner as follows.....

    1.We use two groups of condensers, other conventional air conditioner use only one condenser.
    2.We use 100% copper pipe, some conventional air conditioner use aluminum pipe.
    3.We use 4 fold evaporator conventional air conditioner use 1 or 2 fold evaporator.
    4.We use branded compressor, some conventional air conditioner don't use brand name compressor.
    5.It can stand heat into 53C outdoor temperature, some conventional air conditioner will shut down at this temperature.

    To get to know the cost of solar hybrid air conditioniners in India thru Onyx or to the price list of their air conditioners


  • harita
    harita -


    Solution for Solar airconditioning 

    Operation philosophy

    The water is circulated, using centrifugal type circulating pump, through the Arun dishes. The dishes are arranged in parallel configuration; therefore a single pump is sufficient for the water circulation through both dishes. The system is kept pressurized at 15 bar pressure to avoid the steam formation in the circuit. The water at 160 °C, from the VAM, is taken as inlet to the Arun®160 dishes and it is heated to 180°C. The average heat output from the two dishes is about 1,00,000 kcal/hr, which is sufficient for the heat requirement of the vapor absorption machine.


    The four dish Arun®160 system generates steam at 5 bar pressure, 150 °C. The steam is directly fed to the efffluent tanks to evaporate the water from the effluent . The water is circulated through the receiver coils, which are placed at the focus of dishes transferring the thermal energy from the sun to the circulating water. The water gets heated by continuous circulation and some portion gets converted into steam. The water+steam mixture is then passed to steam separator tank where dry saturated steam is separated from the water. This dry saturated steam at 5 bar, 150°C is directly mixed with the effluent tanks to evaporate the water. The return condensate at 70 °C is collected and circulated back into the circuit.

    You can see the Arun dish developed by Clique solar here

    Solar assisted cooling systems use the thermal energy of solar radiation captured through solar concentrators to power thermally driven cooling machines. As many cooling loads, such as air conditioning, have a high coincidence with the availability of solar irradiation, the combination of solar thermal and cooling obviously has a high potential to replace conventional cooling machines based on electricity. Larger solar cooling systems have been successfully demonstrated and smaller machines, which could be used in (small) residential and office buildings, are entering the market. About 100 systems have been installed in Europe by several companies till date. The use of solar assisted cooling systems is on the rise in India too. However, solar cooling systems are not yet widely available commercially yet, mainly due to following barriers to its wide acceptance:

      • Only few types of solar concentrators that can deliver the temperatures required by the vapor absorption machines
      • Lack of awareness in the industry for the solar cooling systems
      • Lack of chilling units with small capacities.
      • Higher initial investment costs for the solar cooling systems
      • Source

      48V DC powered 100% Solar Air Conditioner
      DC Inverter Type Solar Air Conditioner
      Hybrid Solar Air Conditioning System
      The above three links are from a chinese solar air conditioner manufacturer and marketer.

      Solar-Powered Air Conditioning for Cars

      PolyU’s department of electrical engineering, in collaboration with Green Power Industrial, has developed an air conditioning system for cars that utilizes a photovoltaic solar panel to power the air conditioning system when the engine is off.

      The solar panel is made of a flexible material so that it can conform to the shape of the car roof, and it charges a battery which, in turn, powers the standalone air conditioning system.

      Traditional vehicles use the engine to turn the air conditioner compressor on via a clutch, and the alternator to power the fans. When the air conditioning system is turned on, the clutch (which is attached to the compressor’s rotor) is pressed by an electromagnet against a wheel that is always being turned by the engine (via a belt) and the clutch then turns,… and the clutch finally turns the engine.

      Source: Clean Technica (


  • harita
    harita -

    Where air conditioning is used, reducing heat gain can save a massive amount of electricity, since air conditioners consume hundreds of watts of power at the very least (for example, 500 watts for a 100- to 200-square-foot room, or 1,200 watts for a 500-square-foot space), and they operate for hours a day. 

    Air conditioners use more electricity than most household appliances.Kyocera’s Green Curtain Activities website consists of photographs and illustrations of the Green Curtain initiative, which shows you how to grow your own Green Curtains. It provides a complete list of materials and instructions, even how to start the seeds.This initiative doesn’t only reduce the demand for electricity from fossil-fueled power plants, but it also reduces the electric bills of those who utilize it.Source: Clean Technica (

    Eco friendly airconditioning alternatives from GE's ecomagination
    Solar Air-Conditioning Systems in North America

    This presentation was created by Lucio Mesquita of solar energy company EnerWorks. It focuses on the use and prevalence of solar thermal air-conditioning in the United States.

    The United States expends large amount of energy on air conditioning for residential and commercial buildings every year, and solar thermal air conditioning currently makes up a small fraction of this. Of the 22 projects that this presentation focuses on, 7 uses flat plate technology, and 15 are less than 5 years old. Total installed capacity in the US for solar thermal air conditioning in 2010 was 704 tons, according to the presentation. The presentation ends with photos and descriptions of solar thermal air conditioning installations.

    This is somewhat dated meaning it is made in 2010. But still is worth a look.

    A pune based company also claims to offer Solar Airconditioners 

    Solar electronics in Pune


  • harita
    harita -

    concentrating solar technologies have found applications for airconditioning also. Vapour absorption machines are widely in use in the country forcooling that require heat in the form of steam or pressurized hot water. The steam/hot water is generally being generated using conventional fuel which can partially besaved by installing steam generating systems based on solar concentrators. A fewsuch systems are operational in the country which include 100 TR air conditioningplant at Muni Seva Ashram, Vadodara; 92 TR at TVS, Suzuki factory near Chennaiand 30 TR plant at Magnetic Mareli, Gurgaon etc. Another system of 212 TRcapacity (160 TR on vapour absorption technology and 52 TR on liquid desiccantcooling) is under installation at Chattrapati Shivaji Maharaj Hospital, Kalwa governedby Thane Municipal Corporation, Maharashtra (TMC).Solar cooling has a vast potential in the country. It is, however, an energyintensive process. But it is also true that cooling demands are maximum mainlyduring day time when solar energy is also prevalent, and this is more so in the hotsummer season. India has abundant sunshine in major parts of the year. Solarcooling / refrigeration is, therefore, most relevant for our country especially in view ofthe rapidly increasing demand for energy and shortage of electric power. The cost ofthese systems are, however, presently high and  thus efforts are being made tobring down the cost through R&D mainly by i) improving the performance of existingtechnologies ii) developing  triple effect vapor absorption machines with high coefficient of performance (CoP) and iii) developing newer models of cost effectivetechnologies on solar cooling.Efforts are also being made to develop newer technologies which includesParabolic trough concentrators with single axis tracking arrangement and Paraboloiddishes with two axis tracking. These technologies  have already been demonstratedsuccessfully in abroad especially for the purpose of power generation. Like

  • harita
    harita -

    Did you know that about 5 percent of all the electricity consumed in the United States is used for air conditioning? Most air conditioning units are inefficient electricity hogs but in the 21st century, air conditioning is considered a necessity during the warm months.

    This got one man from South Carolina, Jamie Edens, thinking about ways he could pair solar technology with air conditioning to create an affordable solar-powered air conditioning unit for the general public. He approached truck equipment company Kingtec who already had experience in manufacturing highly efficient a/c units that run on batteries; truckers use Kingtec’s models to cool their vehicles when stopped for sleeping.

    Edens successfully built a  solar prototype which Kingtec then agreed to turn into a real unit. The designer even recently traveled to China to see how the unit was developing:

    “The new air conditioner blows three times harder and has twice the BTU output,” he told Treehugger. “The efficiency is there and it is ready to change the world. It’s not a toy- the beauty of this air conditioner is that all of the solar components are installed in the air conditioner and the engineering is done for you. All you need to do is plug in your solar panels and turn the unit on…”

    At 16,000 BTUs, the unit is not the same size as most residential air conditioning units. A unit that size is designed to cool about 600 SF.

    But advocates for the system argue that it is intended as part of an overall energy-efficient design. Paired with a sustainable design, efficient windows and insulation, the unit is plenty capable.

    “Air conditioning doesn’t need to burden to the grid, our finances and contribute to global pollution,” Edens said. “It can contribute a new start to clean things up and sustain the earth for the long run.”

    Innovation Down Under Could Mean Off-Grid AC

    The serious heat of the summer is over for much of the country (sorry, Texas and SoCal). But the memory of what may well be the hottest summer on record has left a vivid impression on many of us. Sure, that air conditioning feels good when the mercury rises. What doesn’t feel so good is knowing that the very tech we’re using to keep indoor temps cool is contributing to the problem outside. More AC units pulling more electricity from the grid for more days out of the year means more greenhouse gas emissions, laying the groundwork for even hotter weather to come. It’s a vicious cycle a lot of people would like to turn around.

    Slowly but surely, the technology behind solar air conditioners is starting to improve, improving our chances of cutting the carbon footprint of cooling. One design that caught our eye this summer comes courtesy of Paolo Corrada, a PhD science and engineering student in at the Queensland University of Technology in Queensland, Australia. Corrada’s solar air conditioning system, according to Green Optimist, cuts electricity consumption by 90 percent.

    Paolo Corrada, QUT

    image via Queensland University of Technology

    Corrada’s design is based on the absorption chiller, a well-proven and efficient technology that has played a part in many greener cooling systems around the world. (For example, in Abu Dhabi.) Australian smarts have also played a part in other eco-friendly  variations on the absorption chiller, including the world’s first hybrid solar electricity/solar thermal cooling system, which is currently in use at a house constructed for the 2007 Solar Decathlon.

    The absorption chiller uses a chemical process to reject heat. It’s more effective than the more common mechanical process of vapor compression at accomplishing this when used it’s in conjunction with waste heat or solar thermal heat. Corrada’s device is revolutionary because it also incorporates a desiccant wheel to remove moisture from the air, and because it makes use of the rejected heat from the absorption chiller to regenerate itself and to produce hot water for the house.

    The combo of the two technologies together increases the unit’s efficiency by 40 percent as compared with current solar cooling systems on the market, according to Corrada. (It’s also quieter, as it employs a small pump, rather than the compressors used in standard split systems.) But Corrada’s not satisfied with that miserly energy profile — he wants to make this one a no-brainer.

    “My target is to make it 100 per cent [more efficient than current AC systems] so that the system is self-sufficient to run…[without support from] the main grid, costing the home owners nothing to run,” Corrada said. “Heating and cooling account for about 65 per cent of energy consumption in a house, whereas cooking accounts for only 6 per cent so it is easy to see why air conditioning devices are the main targets to reduce our energy consumption.”

    All of which, you’ll have to admit, is pretty cool. source

    Kingtec has developed affordable solar-powered air conditioning in a relatively neat package. Here are some of the key details:

    • Price: $2,895 USD.
    • Cooling capacity: 16,000 BTU (4.7 kW of cooling capacity).
    • Power consumption: 850 watts.
    • SEER (Seasonal Energy Efficiency Ratio): 22.5.
    • EER (Energy Efficiency Ratio, which is a measure of the BTUs of cooling capacity per watt of power consumed): 18.8.
    • Weight: 200 pounds (This is tremendous for a window air conditioner of this size! But it does contain extra parts for the solar setup).

    Why Solar Panels Are Not Integrated Directly into A/C Units

    A/C units tend to be shaded by the roofs of houses, as well as awnings, so they are usually not exposed to direct sunlight, and they shouldn’t be. It is best that they are kept as cool as possible.

    This single issue is a big one, but as long as the solar panels can be a decent distance away, this isn’t a problem.


    Main Benefits of Solar Air Conditioning

    Normally, to solar power an air conditioner, you would have to buy an air conditioner, then a separate inverter, separate batteries, solar panels, and hire both an electrician and a building contractor to set up the system for you, and that costs a fair bit of money.

    Home solar power systems tend to cost $7 per watt in the United States (without tax credits), and around half of that cost is installation alone — this is because you have to hire contractors to set up the electronics such as the batteries, panels, etc. by hand.

    However, for situations where it works, there are some big advantages.

    The second benefit: Solar panels tend to generate more electricity at the same time that air conditioner power consumption increases. The fluctuating power consumption of air conditioners (caused by weather variation) is a problem for the electricity grid because power plants are not able to adjust their power production quickly enough to meet power demand spikes.

    Cutting Your A/C Use

    Finally, while this is a clever invention which can take advantage of economies of scale (due to factory production), unlike traditional hand-built solar setups, you can substantially reduce your air conditioner usage using simple measures such as closing window blinds on some windows, opening other windows to facilitate ventilation, and much more.

    One of the greatest conservation tips of all is to use less energy (not reduce your standard of living, just turn things off when you aren’t using them — you don’t have to use them less to conserve energy), then go about obtaining energy from more sustainable sources, in general.

    Source: TreeHugger
    Photo Credit: Kingtec Solar


  • jetwen
    jetwen -

    Solar Air Conditioners- ACDC12

    Save Over 80% On Air Conditioning & Heating Costs

    Connect Up To Three Panels (Max 700W)
    Uses Solar Power& 220VAC Power
    11000BTU Cooling/12000BTU Heat
    Easy Plug Solar Connection
    No Batteries Needed
    No Inverter Needed
    No Controller Needed
    During daytime, the system will be working primarily by solar power with SEER 35, during night time, the system will work with high efficiency SEER 20 on all-AC power.
    Home or Office
    Solar Powered Air Conditioner

    More than 80% solar power will be used for cooling or heating. For cooling solar AC will work at temperature as high as 49 Celsius. For heating, ACDC12 solar heat pump will provide solar powered heat working at minus 15 Celsius or above. So even you if you are in very hot or very cold place this system can work for you. It is designed to use either 50Hz and 60Hz power for the AC connection.
    Mini-Split Solar Air Conditioner

    ACDC12 Solar Air Conditioner need no batteries, and only need two or three PV panels to get a big savings. In the daytime, when air conditioner need more power to run, you can switch it to use solar power and use a little bit AC power. Because this system is ductless , you don’t have to worry about loss of heat or cooling leaking out from duct system. The most important notice: this is not an off-grid unit, understand that 220V power is always required.

    It is a special DC Inverter air Conditioner so the ACDC12 compressor and all fans etc. runs on DC power converted from AC power all the time. But this ACDC12 solar air conditioner can also accept DC power directly from solar panels, without needing an inverter, controller, or batteries. Using the solar DC power can cut daytime energy costs from utility company for air conditioning or heating by 85%. During the day, the ACDC12 can get majority of power from solar giving efficiency above SEER35 when using two 230W solar panels. The unit can be connected normal 30 Volt solar panels up to 700 total Watts.
    Installation of our Solar Air Conditioner

    ACDC12 installs in the same way as any normal mini-split air conditioner, after normal installing process then you connect the solar panels using the standard parallel method. You can use 1,2, or 3 normal 235w panels of 30 volt to a total of up to 700W. The ACDC12 uses R410a, it is friendly for the environment and for customer to self-install but we recommend to work with a hiring a professional AC installer. A vacuum pump should be used for installation.
    Contact us for more detailed Specifications.

    Benefits of Soltech’s Solar Air Conditioner ACDC12

    Can save over 80% On Cooling& Heating Costs
    Runs On Solar Power& 220VAC Power
    11000BTU Cooling /12000BTU Heat
    Each Plug-In Solar Connections
    No Batteries Required
    No Inverter Required
    No Controller Required
    Applications of Our Solar Air Conditioner

    Home / Office
    Commercial and Industrial Applications
    How To Buy Our Solar Air Conditioner

    We accept samples order at regular list prices. Also, you will get discount price if you order container quality. All samples ship with ETL certification for US/Canada. Production orders can also have CE, RU, SSA, or other ETL country mark as needed, please inquire. Private label OEM service is available.

    Contact person: Miranda
    Company: Soltech International Co.,LTD
    Solar Air Conditioner links: Like

  • rajasekaranth
    rajasekaranth -

    I am planning to have all the equipments powered by solar energy in my house which is under construction. I have almost decided to have mostly LED lamps and solar AC. Calculation shows that a 2 KW system is sufficient. The house has 3 bedrooms (each ~130sq ft), Kitchen and hall. These areas will have false ceiling and hence I like to have cassette type of AC. I need AC just for a few days in peak summer and other times just fan is sufficient. Since fan may not look good in the false ceiling, the casette type AC can be used as a fan without cooling. Can some one suggest a reliable and cost effective solar AC system? I have come across AC systems with 48VDC compressors and also inverter type ACs? Which is better and reliable?

    Rajasekaran Like

Leave a Comment

Solar FAQs
What are the Incentives Available for Rooftop Solar Installations in India?
What are the Opportunities for IT & Software Professionals in Solar?
Is Solar Power Really Cost Competitive Against Conventional Grid Power?
Is Solar Power the Best Sector for Me to Invest My Money in?
I Wish to Do Business in the Solar Energy Sector. Which is the Best Biz Opportunity?
Click Here to View the Complete List of Questions Answered

Recent Updates On Solar Bids In India- Read this MW Solar Expert Guide - Know More Close