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[bldg-sim] Geothermal heat pump system



I am in the process of modeling a Geothermal Heat Pump system in DOE2.1E, using the following:

SYSTEM = HP
BASEBOARD-SOURCE = HEAT-PUMP
HEAT SOURCE = HEAT-PUMP
HP-SUPP-SOURCE = ELECTRIC

HP-LOOP-HEATING = FROM-GROUND
HP-LOOP-COOLING = FROM-GROUND

The results indicate that heating is not coming on.  Report SS-O shows many
underheated hours. 
Does anybody know how to model this?

thanks in advance!

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