Air Conditioning - 09/05/03 05:39 PM
I'm curious as to how air conditioners work. I know that a compressor in the air conditioner compresses a gas that in doing so cools the gas and the heat is given off to the outside air. I know the gas is pumped through coils and (inside) air is passed over the coils and the heat in the air is transfered to the coils and the gas, causing the gas to expand. The expanded gas is returned to the compressor to start the cycle over again. Somewhat simplified explanation.
What I don't understand his how all the "work" is calculated.
I saw an advertisement for an air conditioner having a rating of 14 000 BTU. I am assuming they really mean BTU/h. This is suppose to be the rate at which the air conditioner removes "heat energy" from the air. This air conditioner also has an electrical rating of 12 A @ 120 V or 1.44 kW.
14 000 BTU/h x 0.293 071 W.h/BTU = 4.1 kW. From what I see, the air conditioner is able to do 2.85 times the amount of work then what it actually uses. How can this be? Is there not some law of thermodynamics being broken here?
I'm sure the numbers are correct, so can someone explain to me how an air conditioner appears to use more power then it uses?
What I don't understand his how all the "work" is calculated.
I saw an advertisement for an air conditioner having a rating of 14 000 BTU. I am assuming they really mean BTU/h. This is suppose to be the rate at which the air conditioner removes "heat energy" from the air. This air conditioner also has an electrical rating of 12 A @ 120 V or 1.44 kW.
14 000 BTU/h x 0.293 071 W.h/BTU = 4.1 kW. From what I see, the air conditioner is able to do 2.85 times the amount of work then what it actually uses. How can this be? Is there not some law of thermodynamics being broken here?
I'm sure the numbers are correct, so can someone explain to me how an air conditioner appears to use more power then it uses?