Quote:
Originally Posted by charlesfl
Dumb question.
Given the Carnot cycle limits how is the efficiency achieved with lower temperature difference for gshp?
Is it by lower compressor amperage used, shorter run times or something else?
|
Carnot is inversely involved with a heat pump cycle.
Look at it this way: it takes work to pump water uphill, in a like manner it takes work to move heat from low temperature to higher temperature.
Thus, lower temperature difference (as in GSHP from 55F earth to 100F air vs. 20F air to 100F air) means less work to pump heat to higher temperature, just like less work to pump a given quantity of water fewer feet uphill.