the compressor heats up the cooled liquid (which has gotten warmer already by absorbing heat) into a hot pressurized gas. with the release of pressure by going through the expansion valve the gas is cooled abruptly from the change in pressure, so why do all diagrams for it show coils dissipating the heat before reaching the expansion valve? is it really necessary? won't it cool to the same temperature after the change from very high to very low pressure?
in response to the car AC analogy, how can heat be dissipated (lost to environment) while keeping the pressure the same? according to the ideal gas law: PV = nRT
pressure is inversely proportional to temperature, therefore, a decrease in temperature should net an increase in pressure….AH! there's the answer, you're absolutely right, by increasing pressure, it will allow an even larger pressure reduction at the expansion valve making it easier for the gas to be forced through. thank you so much for the help, it makes much more sense now. but now i have to ask, does my reasoning even make sense or did i miss something else?
Desert Tripper, just to get things straight. after the gas goes thru the Expansion Valve, it is turned to liquid, and as it absorbs heat it is slowly returning back to a gas as it reaches the compressor, which is the reason it is able to be compressed (cuz it's a gas now). so now it's under very high pressure as a hot gas, the heat is dissipated by going through the condenser coil, which brings the temperature down to switch it back to a liquid. it passes through the expansion valve where the pressure is greatly reduced forcing a higher boiling point, which forces all/most of the gas into a liquid so it can absorb heat again. but i think i'm still missing something, why does it need to be partially turned into liquid before hitting the expansion valve by going through the condenser coil when the real phase change occurs due to the change in pressure at the expansion valve?

HVAC Georgia