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Title: Impact of HPWH Placement on Water Heating Performance and Effect on Air Temperature in its Immediate Environ

Heat pump water heaters (HPWHs) extract thermal energy from their surroundings to make hot water with two to three times better efficiency than conventional electric resistance water heaters. But, how much does HPWH placement influence its performance? This paper summarizes performance metrics of two 189 L (50 gallon) HPWHs one placed within conditioned space, and the other placed in the garage of two separate, but similar research houses each delivering approximately 208 L/d (55 gallons/d) hot water under simulated occupancy conditions. Both houses had space conditioning set points of 24.4 C (76 F) and 21.7 C (71 F) in Summer and in Winter, respectively, and hot water temperature setting of 48.9 C (120 F). Performance metrics are compared on a monthly basis for 2011.
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  1. ORNL
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Resource Relation:
Conference: 11th IEA Heat Pump Conference, Montreal, Canada, 20140512, 20140512
Research Org:
Oak Ridge National Laboratory (ORNL); Building Technologies Research and Integration Center (BTRIC)
Sponsoring Org:
EE USDOE - Office of Energy Efficiency and Renewable Energy (EE)
Country of Publication:
United States