Quote:
Originally Posted by AC_Hacker
Vlad,
I understand that you're a refrigeration mechanic, but I don't know if you have worked with the more recently made mini-split heat pumps.
They have evolved very rapidly and have developed many design efficiencies that, as far as I know, are not yet found on larger whole-house heat pump systems.
You might be surprised how many of the problems you mentioned, have already been solved.
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"There is no magic in the pipe"
Our instructor loved this expression. And I agree with him. You can not cheat the physical process you can improve it but you have limitations with ASHP as same as GSHP. When outside is cold your unit has to fight against big TD (air will be dry because it can not hold moisture) , sacrificing efficiency. When outside is worm your unit has to fight against freezing (the warmer the air the more moisture it will hold), again sacrificing efficiency (TD is better).
Ideal situation worm air and dry but it is not the winter scenario.
The GSHP is so efficient because it has no defrost cycle and TD is low. There is no other big factors.