How does an air conditioner cool down a room?
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Have you ever used a bicycle pump or a spray can?
Did you notice that the tip of the pump heats up during use, and that the can feels colder after use?
This is two reverse sides of the same physical phenomenon:
* Compressing a gas creates heat.
* Decompressing a gas sucks heat in.
When you touch the can, your fingertips “feel” cold because heat is being sucked out of them by the surface of the can.
So you can use that principle to cool down air.
We put a specific type of gas under pressure in a spot where it doesn’t matter if heats is released, then we release the gas through an S shaped closed pipe system, where it will suck heat in while cooling out the air that touches the pipe.
This is why there are always two sides to cooling systems:
* The back of your refrigerator lets warm air flow away, while the inside cools the air down.
* The part of your air conditioning that sticks outside releases warm air, while the part inside cools it down.
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