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Wind-chill again! How about air conditioning?.............
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Shimmy1
Posted 12/7/2018 18:56 (#7156207 - in reply to #7154132)
Subject: RE: Wind-chill again! How about air conditioning?.............



Central ND
WItitan2 - 12/6/2018 20:27

Sooooooo, correct me if I'm wrong, but doesn't the whole theory of air conditioning depend on decompressing refrigerant. When the compressed liquid is allowed to expand it picks up velocity and cools? Kinda like when you open up the valve on an oxygen or lp tank and the compressed gas rapidly escapes and Frost's the valve.

Starting before the compressor. Cold gas gets compressed, which in turn generates heat. Hot gas goes to the condenser, where heat is removed. Removing heat from a hot gas under pressure causes the gas to condense into liquid, so now you have hot liquid, under the same high pressure. Just like increasing the pressure in a cooling system increases the boiling point, the same thing is happening to the refrigerant. Hot liquid then goes to either an expansion valve, or orifice tube. When the hot, high pressure liquid passes through the TXV or orifice, it becomes a low pressure liquid. Since the pressure has now been reduced, so has the boiling point, and as a result, the temperature. At this point, the low pressure liquid enters the evaporator. As air is passed through the evaporator, the low pressure liquid easily absorbs heat which causes it to evaporate, and the low pressure gas heads back to the compressor to start the cycle over.

So, to answer your question, yes, decompressing refrigerant allows the system to work, but not because of the velocity of the refrigerant. It's the physical properties in regards to pressure and the related changes in boiling point.

Edited by Shimmy1 12/7/2018 18:59
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