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so it takes allow outside air to come quickly in your room (your room will look like a PC case though).
Go to a junk shop and buy an old refrigerator or a/c. Take their compressor and put in your box.
Go to a junk shop and buy an old refrigerator or a/c. Take their compressor and put in your box. That is the only way I can think. Otherwise just buy an a/c. By the way, the fan alone wont cool the room at all unless it is located in your window, so it takes allow outside air to come quickly in your room (your room will look like a PC case though). You might fell a little cool, but that is because the wind helps sweat evaporation which draws some amount of heat of your body, but there is a limit for that if you are in a closed room.
Sorry for droning on about non robot stuff.
http://en.wikipedia.org/wiki/Evaporative_cooling
It works because heat energy is removed from the air by converting water to vapor (it's the same as cooling a room using ice). The only way heat would be added back to the room is if the water vapor recondenses into water. This will not happen in a dry, warm climate. Of course over a long enough timescale in a closed system the air would saturate with water vapor and evaporation would no longer occur, but for practical application this is not often a concern.- Ben