A property of refrigerant that makes it useful to air condition a house or building is the ability to read the pressure of the refrigerant and know it's temperature. Refrigerants will change from a liquid state to a vapor state at a very low temperature. If you control the pressure of the refrigerant you can control the temperature it changes state at.
For example, a drum of liquid R-22 at 80 degrees will change from a liquid to a gas and the pressure will increase as the gas expands. When the pressure reaches around 143 lbs, the boiling will stabilize and as long as the temperature remains constant the pressure will remain constant.
If the drum is moved to a cooler area the pressure will be affected. If the new area is 60 degrees the refrigerant gas will condense back to a liquid and the pressure will drop. When the pressure reaches around 102 lbs the condensing of the gas will stabilize.
If you connected a regulator to the R-22 refrigerant drum and allowed liquid refrigerant to pass through it into a coil and set the regulator at 58 lbs the coil temperature would be controlled to 32 degrees until you ran out of refrigerant. If you blew 75 degree air across the coil some heat in the air would be absorbed by the refrigerant and the air temperature would drop.
More later.
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