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If we increase the coil temperature, we decrease the amount of heat transfer (work)
By means of EPR adjustment, true.
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If we are at 0 suction at the compressor, the 1/2 horse is rated at approx 3,250btuh, the 3/4 is rated 4,318btuh.
Gary, does the compressor capacity at the evaporating temperature of the compressor relate directly to a load being served a differing evaporating temperature (in the case of an EPR)? I always wondered
Yes. The mass refrigerant flow entering the compressor is the total system flow at that point in time, representing the work being done by the system. Somewhat less than 1/2 ton, I would say.
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Has anyone explained the temperature differences that Tom Richardson concerns himself with, in terms of superheat? ... or did Gary not want to open that can of worms, LOL !!!
One can of worms at a time. :D
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Oh, and one thing that comes to mind... if a 20deg cold plate is adequate (or even desired), I assume the design Evaporating temp of the forced air unit cooler to be approx. 20F, why are we employing an EPR?
Because the actual load is somewhat less than 1/2 ton? Because we want to maintain high humidity? Because we want our frost top at a lower temperature?