Quote:
Originally Posted by BradC
My gut feeling is the compressor does not have enough capacity. The TXV will determine the superheat, but if the SST is too high and the TXV is maintaining any form of proper superheat, the the problem is your compressor can't suck the vapor fast enough to drop the evaporation temperature.
<edit> after re-reading your original post I'm certain the problem is the compressor. Do you have links to the model numbers for both compressors (or better, data-sheets).
<edit 2> You can reduce your evaporation temperature by throttling the water through the evaporator to effectively reduce the capacity of the evaporator. The lower your evap temperature, the higher your compression ratio and power consumption, which will dump more heat into your condenser.
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We seem to be attacking the same idea from different directions.