Revision history [back]

I have one building with two design options. One applies air source heat pump (simulated as ZoneHVAC:PackagedTerminalHeatPump); the other uses water source heat pump (simulated as ZoneHVAC:WaterToAirHeatPump). Results show WSHP has much more heating than ASHP which seems not reasonable to me. I checked the hourly report and found for ASHP case, heating coil (Coil:Heating:DX:SingleSpeed) did not run at the same time with supplemental electric heating; while in WSHP case, heating coil (Coil:Heating:WaterToAirHeatPump:EquationFit) often run at the same time with supplemental coil. Any control difference between ASHP and WSHP units?

I have one building with two design options. One applies air source heat pump (simulated as ZoneHVAC:PackagedTerminalHeatPump); the other uses water source heat pump (simulated as ZoneHVAC:WaterToAirHeatPump). Results show WSHP has much more heating than ASHP which seems not reasonable to me. I checked the hourly report and found for ASHP case, heating coil (Coil:Heating:DX:SingleSpeed) did not run at the same time with supplemental electric heating; while in WSHP case, heating coil (Coil:Heating:WaterToAirHeatPump:EquationFit) often run at the same time with supplemental coil. Any control difference between ASHP and WSHP units?