Aside from the compressor running, is there any sort of valve in air conditioning that prevents stuff from going the wrong way? I'm trying to figure out if the system could be forced to equalize in the direction of the evaporator, giving you a longer period of cool air with blower on and engine off than letting things equalize in both directions ...
In most systems the discharge valve on the compressor does this job.
Unless you have a scroll compressor with no valves.
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.
It already works that way due to valves internal to the compressor like Bohica said. But you get little cooling by evaporating the small amount of liquid refrigerant in the system only once. It has to be under constant circulation.
Also, to build this proposed system you'd need a large tank to hold the refrigerant vapor so the evaporator pressure can be kept low. Without the compressor running, the low side naturally rises to the point where evaporation stops.
Edited: Fri May 21, 2010 at 4:26 PM by mk378
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