Energy Performance Analysis for Heat Pump Water Heaters

This study investigates the energy savings potential of heat pump water heaters (HPWH) for single family home applications within the service territory of Pacific Gas and Electric Company (PG&E).  Heschong Mahone Group (HMG) conducted the study under the auspices of PG&E’sEmerging Technologies Program. If a HPWH is located within a conditioned space, the air cooling effects generated by the HPWH evaporator can affect the building’s HVAC system operations. During HVAC cooling operations, the HPWH cooling effects can reduce HVAC load and generate additional energy savings. However, the HPWH cooling effects will increase HVAC system energy consumption during its heating operations. This study investigates the HPWH performance and interaction with building HVAC operations to assess overall energy impacts for single family homes located in PG&E service territories.

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