*Saved post*
I forgot to mention, the goal of this unit is to store heated water in a un-powered electric 50gal waterheater. I may leave the elements in, and use a outdoor ambient thermostat to transfer from HP to Elect in <1.0 COP operating temperatures.
Also to note: Switching to r-134a on a r-410a compressor proved fairly significant capacity loss from the compressor. I can only assume the 410CP uses a smaller displacement pump than a 134CP, likely due to the very different pressure and mass flow rates of the 2 working gases. There is probably a slight performance hit as the motor is slightly over-sized now, but that also offers a bit extra overhead to work with.
Last edited by RB855; 12-29-13 at 01:56 PM..
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