Low-cost air conditioning system for open area
The solar-powered air conditioning system is a low cost, environmentally friendly system for cooling air through evaporative cooling. The system includes a motor-driven fan for producing a directed air stream. A water delivery system is in communication with an external water supply and produces water droplets, which are delivered into the directed air stream. Evaporation of the water droplets within the directed air stream lowers the temperature of the directed air stream via evaporative cooling. The motor-driven fan is powered by at least one solar panel, which may be mounted on a water tank for holding the water supply of the water delivery system. Further, a rechargeable battery may be provided for providing power when the solar panel generates insufficient power.
1. Field of the Invention
The present invention relates to air conditioning systems, and particularly to a solar-powered air conditioning system suitable for dry, arid, desert conditions that relies upon evaporative cooling.
2. Description of the Related Art
A wide variety of air conditioning systems have been utilized to provide cool air for both personal comfort and for commercial and industrial purposes. Such systems typically include a compressor for liquefying a volatile substance, or refrigerant, housed within cooling coils. Thermal energy is extracted warm air passed over the cooling coils by a blower, causing the refrigerant to evaporate. The evaporated refrigerant is then passed through a condenser in the outside warm outside air, and the condensed refrigerant is subsequently compressed back into the liquid state and pumped through the cooling coils again. Such systems utilize a great deal of external energy, generally in the form of electricity, and the volatile substances used, such as Freon® (Freon is a registered trademark of E.I. Du Pont de Nemours and Company of Wilmington, Del.), frequently employ chlorofluorohydrocarbons, which are harmful to the environment.
In the southwestern United States, evaporative cooling systems are used that are sometimes referred to as “swamp coolers.” Such systems derive from the [practice of hanging a wet sheet or mat over an open window or screened porch and using a fan to draw hot air in through the wet sheet. The hot air and the water attempt to reach an equilibrium temperature, with heat being transferred from the hot air to the water, resulting in evaporation of water from the sheet and cooling of the air drawn into the structure.
While such systems are effective at cooling the air, nevertheless, there is a need for providing an air conditioning system for dry, arid regions that is low in cost and environmentally friendly. Thus, a solar-powered air conditioning system solving the aforementioned problems is desired.
SUMMARY OF THE INVENTIONThe solar-powered air conditioning system is a low cost system for cooling air in dry, arid conditions through evaporative cooling. The system includes a motor-driven fan for producing a directed air stream. A water delivery system is in communication with an external water supply. The water is introduced into the directed air stream in droplets. Evaporation of the water droplets within the directed air stream lowers the temperature of the directed air stream via evaporative cooling.
Several methods are available for producing the water droplets. The external water supply may include a water tank or reservoir disposed above the directed air stream. The water tank may have a plurality of orifices defined therein, the water draining through the orifices in droplets by gravity feed. In order to promote the formation of small or micro (fine) droplets, a screen or mesh may be disposed beneath the water tank so that water draining through the tank is formed into water droplets by passing through the screen into the directed air stream. Alternatively, at least one atomizer could be positioned adjacent the fan to spray atomized droplets into the air stream. The atomizer is in fluid communication with an external source of water, and the water may be further charged into the atomizer by a pump. In another alternative, the atomizer may alternatively be built directly into the fan, with the blades of the fan having atomizer nozzles mounted in their front faces for spraying atomized droplets directly into the air stream.
The motor-driven fan is powered by at least one solar panel, which may be mounted on the roof or walls of the water tank, which holds the water supply of the water delivery system. Further, a rechargeable battery may be provided for providing power when there is insufficient sunlight to produce enough current from the solar panel to provide power to the fan. The rechargeable battery charged by the solar panel during the day, and provides power to the fan and pump, thus allowing both to operate at night.
These and other features of the present invention will become readily apparent upon further review of the following specification and drawings.
Similar reference characters denote corresponding features consistently throughout the attached drawings.
Detailed Description of the Preferred EmbodimentsWater 13 is initially supplied from a conventional external source of water, such as a natural body of water or conventional plumbing, to fill a water reservoir or water tank 12. Pure water, sweet water or salt water may be utilized as coolants. Similarly, any suitable liquid that will cool a directed air stream through evaporative cooling may be utilized, such as alcohol. Additionally, additives, such as scented substances, oils, fragrances, or alcohol, which has a higher rate of evaporation than water, may be added to the water.
As shown, water may be supplied from an external conduit 36 by a pump 34 to fill the water tank 12. The water tank 12 may be any suitable receptacle or reservoir for holding the water supply. In a first embodiment, the lower wall 15 of the tank 12 comprises a drip plate having a plurality of orifices 17 formed therethrough, as shown in
System 10 includes a fan 18 powered by electric motor 20, both of which may be of conventional design in the embodiment shown in
Preferably, water tank 12 is positioned in an open area, allowing for solar exposure on solar panels 26. Solar panels 26 can, alternatively, be positioned away from tank 12, such as on the roof of a building or other structure. Preferably, tank 12 is positioned above the directed air stream 16 generated by fan 18, as shown in
As further shown in
It should be understood that
In the alternative embodiment of
In the alternative embodiment of
Pump 34, shown in
In another alternative embodiment, shown in
Water is received, under pressure, in a lower chamber 60 (supplied via pressurized water line 44, shown in
System 10 relies on evaporative cooling in order to cool directed air stream 16, rather than relying on conventional compressor techniques, thus making system 10 an environmentally friendly system, which is further low cost to operate and build. Further, the system is solar-powered and utilizes the force of gravity in the embodiments of
It is to be understood that the present invention is not limited to the embodiments described above, but encompasses any and all embodiments within the scope of the following claims.
Claims
1. A solar-powered air conditioning system, comprising:
- a fan for producing a directed air stream;
- a coolant reservoir;
- means for delivering coolant from the coolant reservoir into the directed air stream in droplets in order to produce evaporative cooling; and
- a power source having at least one solar panel containing an array of solar cells for generating electrical power from the sun, the power source being electrically connected to the fan.
2. The solar-powered air conditioning system as recited in claim 1, wherein said coolant reservoir comprises a water tank adapted for holding water, the tank being mounted above the directed air stream, the tank having a lower wall, said means for delivering comprising a plurality of orifices defined in the lower wall of the tank, whereby the lower wall forms a drip plate, water draining through the drip plate by gravity and being formed into droplets.
3. The solar-powered air conditioning system as recited in claim 2, wherein said means for delivering further comprises a mesh screen disposed between said drip plate and the directed air stream, the mesh screen having a screen size dimensioned and configured for further dividing the water droplets into fine droplets.
4. The solar-powered air conditioning system as recited in claim 2, wherein said at least one solar panel is mounted on said water tank.
5. The solar-powered air conditioning system according to claim 2, wherein said coolant reservoir further comprises a roof mounted above said water tank.
6. The solar-powered air conditioning system according to claim 5, wherein said at least one solar panel comprises at least one solar panel mounted upon the roof over the water tank.
7. The solar-powered air conditioning system according to claim 2, further comprising a pump connected to said water tank for filling the water tank with water, said pump receiving electrical power from said power source.
8. The solar-powered air conditioning system according to claim 1, wherein said means for delivering comprises at least one atomizer connected to said coolant reservoir, the atomizer being disposed to spray coolant into the directed air stream in an atomized mist.
9. The solar-powered air conditioning system according to claim 1, further comprising a fluid conduit extending between said coolant reservoir and said fan, said means for delivering further comprising:
- a plurality of fan blades disposed upon said fan, the fan blades having fluid channels defined therein; and
- a plurality of atomizer nozzles disposed upon each of the fan blades, the nozzles communicating with the fluid channels in order to spray an atomized mist of coolant into the directed air stream.
10. The solar-powered air conditioning system according to claim 1, wherein said power source further comprises:
- at least one rechargeable battery;
- a charging circuit for recharging the battery from current generated in said at least one solar panel; and
- switching means for delivering electrical power to said fan directly from said solar panel when said solar panel delivers sufficient power and for delivering electrical power to said fan from said rechargeable battery when said solar panel delivers insufficient power to said fan.
11. The solar-powered air conditioning system according to claim 1, further comprising a dc electric motor driving said fan, the motor being electrically connected to said power source.
Type: Application
Filed: Aug 15, 2006
Publication Date: Feb 21, 2008
Inventors: Ahmed Z. Al-Garni (Dhahran), Ayman H. Kassem (Dhahran), Abdullah M. Al-Garni (Dhahran), Farooq Saeed (Dhahran)
Application Number: 11/504,083
International Classification: F25B 27/00 (20060101); F28D 5/00 (20060101);