Quote:
Originally Posted by mejunkhound
...In parallel used separate TXV (cheap on ebay or surplus), totally different evaporators, one conventional air, the other water tube in tube. If cold enough to freeze up the air coil, the water coil handled the entire load (air txv basically shuts off)...
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mejunkhound,
Very interesting approach.
So, are you saying that you ran air-to-refrigerant AND water-to-refrigerant concurrently in parallel?
Did you notice any "hunting" as has been suggested is the behavior of non-identical evaporators in a previous post?
Also, are you saying the air-to-refrigerant side shut down when it frosted up?
Was the water-to-refrigerant being drawn on the whole time?
Reason I'm interested is that I'm cooking up a hybrid ASHP/GSHP and I plan to run the ASHP most of the time but when the temp takes a nosedive, I'll bring up the GSHP side.
From the description you gave, it might be possible to allow the system to make the changes... to be self-regulating, depending on frost conditions.
-AC