BACKGROUND OF THE INVENTION
Field of the invention is air conditioning, where cooling occurs by means of water evaporation.
DESCRIPTION OF PRIOR ART
In the prior art cooling occurs by means of water evaporation, water is sprayed over the cooling pad, and water evaporates, the heat required for the evaporation comes from the water and air (which passes over the cooling pad) so the air and water both gets cooled. Because air passes from the cooling pad comes in direct contact with water and air get moist, so the relative humidity of air increases which need proper ventilation of area being cooled. This ventilation requirement restrict it to be used in closed area (closed area = area without ventilation)
SUMMARY OF THE INVENTION
the present invention is the cooling device, which uses water evaporation technique to cool the air, and the air cools the surrounding. Water evaporation process needs the energy to complete this process, and water takes this energy from the water itself, and from object which is in contact with the water, water absorbs energy in form of heat and evaporate, water molecules which have higher kinetic energy evaporate and leaves the remaining water and the object cool. In Fig 2 cooling process is totally dependent on natural evaporation of water, so it can be affected by the outer atmosphere, evaporation occurs when the relative humidity of air is less than 100%, relative humidity, and air temperature directly affect evaporation rate, and affect the cooling process. In this device evaporation process occurs on the outer surface of the thermal conductive pipe wrapped in thin cotton cloth, and air pass from inside (volume) of thermal conductive pipe, in cooling process of air there is no direct contact between air and water, and it prevents air to get humid, because this device doesn't increase relative humidity of air, it can be used in closed area as well as in open ventilated area, and it also recirculate air and cool same air which being cooled before!
In Fig 4 a vacuum pump is connected to the air sealed chamber; the air sealed chamber contains thermal conductive pipe, and water, In air sealed chamber evaporation occurs due to low atmospheric pressure, which is caused by a vacuum pump. Water evaporates faster in low atmospheric pressure and cools the remaining water, water and outer surface of thermal conductive pipe are in direct contact with each other which allow the thermal conductive pipe to cool, now the air pass from the inside of thermal conductive pipe which loses its heat to the thermal conductive pipe and cools down. The evaporation process which occurs in Fig 4 inside air seal chamber is due to low atmospheric pressure, so there is no effect on evaporation, process of relative humidity, and of air temperature. In Fig 4, by the maintaining

vacuum level evaporation rate can be controlled, high vacuum, faster evaporation
rate, lower temperature, low vacuunvless-evaporation, high temperature, that's how
thetemperature of air(air which is being cooled) can be controlled.
The surface area of thermal conductive pipe can be increased, inside and outside,
which increase the efficiency of the device. On the place of cotton cloth, baked clay
layer can be used! ^
BRIEF DESCRIPTION OF DRAWING
Fig. 1 is the front view of the thermal conductive pipe.
Fig. 2 is the front face and cross-section view.
Fig. 3 showing the side of present art.
Fig. 4 is showing the perspective view of present art. (attached to the vacuum pump)
DETAILED DESCRIPTION OF DRAWING
Fig 1 is thermal conductive pipe wrapped in cotton cloth 2.
Thermal conductive pipe 1 supported by the front frame 3 and the backside frame 4, at the front end of the thermal conductive pipe 1, fan 5 propel the air, due to propulsion of air by fan low air pressure area create behind the fan, for maintaining the air pressure balance air rushes from the behind, so air enters in thermal conductive pipe 1 from the backside end 6 of thermal conductive pipe 1, because there is no other space for air to enter from for maintaining the air pressure balance, air has to enter through inside 7 of thermal conductive pipe 1 Circulation of air is shown in Fig. 2. Air enter in hollow space 8 follow the path 9, 10,11, and exit at front end 12 of the thermal conductive pipe 1. water container 13 filled with water, a water pump 14 pumps water to water distributor 15, then distributor distribute water through nozzle 18 over thermal conductive pipe 1 (water distribution is a cyclic process of water sprayed over thermal conductive pipe, and again collected in water container, this process repeats. Loss of water only happen due to evaporation of water, water evaporate and mix with air, this mixed humidified air propelled outside from cooling area space with the help of exhaust fan) which is wrapped from thin cotton cloth 2, (cotton absorb water, it prevents water slipping from the surface of thermal conductive pipe, and it also prevents thermal conductive pipe from sudden dryness) cotton 2 absorb water and start evaporating water, due to evaporation of water, cotton cloth 2, leftover water, and outer surface 16, all loose temperature and cools down. The pipe is thermal conductive so the inside surface 17 also cools down. Air pass from the inside 7 of thermal conductive pipe 1 comes in contact with inside surface 17 of thermal conductive pipe 1 and loses its temperature to thermal conductive pipe 1 and cool. Humidity is increased in evaporative chamber 18 due to water evaporation, this humidified air propelled outside by exhaust fan 19. Exhaust fan 19 continuous propelled air outside evaporative chamber 18, and fresh air enters from air pass 20, which also increase the evaporation of water, and cools thermal conductive pipe 1 faster.
In Fig. 4 evaporative chamber 22 is air sealed so that air does not rush from outside to inside or vice versa. A vacuum pump 25 connected to evaporative chamber 22 by a pipe 24, which is wrapped by heat insulating material, evaporative chamber 22 is

filled with water, vacuum pump creates low-pressure inside evaporative chamber^ at low-pressure water start eva'pocate-faster-rfor-the evaporation_ofwt^it7equlres^ energy, evaporation process takes energy in form of heat from the water itself so water cools down, water is directly in contact with thermal conductive pipe 21 so thermal conductive pipe 21 also cools down. The process of air flow is same as mentioned above.-When air comes in contact with inside surface of thermal conductive pipe it loses heat to the thermal conductive pipe, thermal conductive pipe looses heat to water, and water loses its heat in evaporation process, which is released outside in the atmosphere. In this process flow of heat is from cooling space to conductive pipe 21, conductive pipe to water, and from water to the evaporated molecule of water and finally in the atmosphere. Control over temperature can be managed by the rate of evaporation of water, less atmospheric pressure inside evaporative chamber 22 higher evaporation rate, the higher atmospheric pressure inside evaporative chamber 22 less evaporation, A water hose 23 connected to evaporative chamber 22, evaporative chamber 22 which also contain water, when the level of water decrease beyond the certain level (mention during manufacturing) it starts to fill the evaporative chamber 22 from the water. Work of fan 26 is same, as mention above.

Claims :
1. The process of conditioning of air stream, comprising the step of: thermal conductive pipe, outer surface of thermal conductive pipe that is evaporatively cooled by water evaporation, cold conduct to inside surface of thermal conductive pipe, which indirectly (no direct contact of air with water, evaporation takes place on the outer surface of thermal conductive pipe) cools air stream, air enters inside thermal conductive pipe from one end and exit from another end. Airstream loses its temperature, without increasing humidity.
2. The air conditioning process of claim 1 also includes the step of evaporation occurs on the surface of the said thermal conductive pipe.
3. The process of air conditioning of air stream comprising the step of the air sealed chamber contains water, and said thermal conductive pipe, the evaporative process occurs fast in low atmospheric pressure, which is created by the vacuum pump, evaporative process can be regulated by the maintaining atmospheric pressure, thus temperature can also be regulated. Airstream loses its temperature to the said thermal conductive pipe.
4. The air conditioning process of claim 3 also includes the step of lowering the pressure of evaporative chamber by the vacuum pump, the temperature of the water drop.
5. Air conditioning apparatus comprising of a frame, holding said thermal conductive pipe which ends open out of the evaporative chamber, a water storage tank, a water pump, which pumps water through water distributor on thermal conductive pipe, electrically driven exhaust fan, mounted on side panel of said evaporative chamber, which propel humid air outside of evaporating chamber, a electrically driven fan mounted with frame in front of one end of the said thermal conductive pipe for propulsion of cooled air stream.
6. Air conditioning apparatus of claim 5 also comprising of said fan, exhaust fan, water pump, connected from an electrical source and can be controlled separately.
7. Air conditioning apparatus in Fig 4 comprising of air sealed chamber holding said thermal conductive pipe, said thermal conductive pipe fitted in such a way that both ends of thermal conductive pipe open out of the air sealed chamber, said sealed chamber containing water, which is directly in contact with thermal conductive pipe, a vacuum pump connected with air sealed chamber with the help of pipe, pipe is thermally insulated, a fan mounted outside the air sealed chamber in front of one end of said thermal conductive pipe.
8. Air conditioning apparatus of claim 7 also comprising of: said vacuum pump, and fan, connected with electrical source, and fan can be managed separately, and vacuum pump control depends on how much drop in temperature is required.

9. Air conditioning apparatus of claim 7 also comprising of water fill-in hose pipe,
water fill-in hosepipe connected to the said air sealed-evaporative chamber it fills
evaporative chamber when the water level is below said level.
10. The surface area of said thermal conductive pipe of claim 5, 7, can be increased
from both outside and inside, the thermally conductive material can be used to
increase surface area. Note: the outer surface of said thermal conductive pipe can
be wrapped and coated with baked clay only in case of apparatus of claim 5.