CO2 heat pump water heater

published Jun 26, 2014 - 10 pages

A joint presentation at ATMOsphere America 2014 by Maho Ito of Sanden International USA and Ken Eklund, Washington State University Energy Program laboratory, presents test results of CO2 heat pump water heaters. Laboratory tests have shown an Energy Factor (EF) of 3.35 and Coefficient of Performance (COP) of 4.2 at outside ambient temperature of 67°F(19.4°C), compared to average electric resistance water heater of less than 1.0 EF. Field tests at four single-family homes in N

A joint presentation at ATMOsphere America 2014 by Maho Ito of Sanden International USA and Ken Eklund, Washington State University Energy Program laboratory, presents test results of CO2 heat pump water heaters. Laboratory tests have shown an Energy Factor (EF) of 3.35 and Coefficient of Performance (COP) of 4.2 at outside ambient temperature of 67°F(19.4°C), compared to average electric resistance water heater of less than 1.0 EF. Field tests at four single-family homes in North Pacific States are currently ongoing, with results so far indicating a field performance very similar to that predicted from the lab test results.


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