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[EnergyPlus_Support] Re: Extremely high Supp. Heater Electric Power and Low GHX Outlet Temperature

Your ground loop is probably too small. For a closed loop GSHP system - you can expect the ground loop temperature to fall to quite low levels -that's how they work. The output of your heat pump then falls - and the auxiliary heating kicks in.  So - make sure you have a big enough heat pump, at the lowest EWT (entering water temperature) from the ground. 



Robin Curtis
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