Annual operating property of heat pump assisted solar central water heater

A heat pump assisted SCWH was proposed via replacing the electrical heating appliance with the heat pump, so the power consumption can be reduced sharply. However, meanwhile, there is few study around the annual operating characteristics of SCWH, so based on the meteorological data in 2005, Xi'an city, a proper mathematical model calibrated by some experimental data was setup to simulate the annual performance coefficient, input power, outlet temperature of the heat pump and electricity assisted SCWH respectively. The result showed the heat pump assisted SCWH has higher efficiency than that of the electricity assisted SCWH.