Hello all, For air-to-water heat pump EIRDefrost is a function of outdoor wet bulb and dry bulb conditions (https://github.com/NatLabRockies/EnergyPlus/blob/6dac73f4f26dfc97d94386701ea288733e372f5d/src/EnergyPlus/PlantLoopHeatPumpEIR.cc#L996). My understanding is since HP is working in cooling mode for defrost, cooling curve EIR inputs may be more reasonable? Shouldn't EIRDefrost then be a function of EWT and ambient source temp (Air)? I am trying to understand why this is a function of outdoor wet bulb and dry bulb conditions in the current source code. Would appreciate if anybody has some idea about the rationale behind this. I will really appreciate if anybody can point to any available curvefits to see how this performance changes.
-Abir
