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Author
Harris, J. E.
Title
Performance of Add-On-Type Heat Pump Water Heaters Using Two Different Test Methods.
Coporate
National Bureau of Standards, Washington, DC
Sponsor
Department of Energy, Washington, DC
Report
NBSIR 83-2723, June 1983,
Distribution
Available from National Technical Information Service
Keywords
water heaters; heat pumps; storage tanks; energy dissipation; computer programs; temperature gradients
Identifiers
energy conservation
Abstract
Two different makes of add-on (without tank) heat pump water heaters (HPWH) were tested. Each of the HPWH's was subjected to a series of recovery tests similar to the Department of Energy (DOE) recovery test for conventional electric water heaters. The results of the tests (recovery efficiency, standby loss, input power, storage tank capacity and energy used) were used to compute an energy factor which could be used to calculate the estimated annual operating cost of such HPWH's. The energy factor was also determined by a series of simulated use tests consisting of four equal draws totaling 64.3 gallons of hot water per day.