Shine Energy Systems Inc.

We can use manufacturer’s tables to determine a heat pump operating COP or we can measure it ourselves.  My caveat is that you are measuring high voltage equipment. So don’t unless you know what you’re getting in to.

COP = Energy Output/ Power Input

We’ll focus on the load side as that is the easiest side to measure.

For heating:
Energy output= heat of compression + heat from ground loop.

Heat of compression = Power input (mechanical supplied)

To get power input you need to measure:

• total amperage draw
• total voltage draw
• Volts x Amps = Watts
• Watts x 3.412 converts it to Btu’s/hr

Note how this work is beneficial to the system when heating and not in cooling.

Your ground loop energy is now determined by measuring your loop fluid flows and temperatures based on:

BTU’s from ground = Q (us gal) x (Tin-Tout) x K

• K = 500 for pure water
• Q can be determined by the pressure drop

Constants K for antifreeze come from the forumla:

Kaf=(100%-AF%)x500 + AF%(500xSGRxSHR)

• AF% = percent of antifreeze
• SGR=specific gravity ratio of the antifreeze to water
• SHR=specific heat ratio of the antifreeze to water