Abstract
Simulation study on the operating characteristics in the solar hybrid R744 heat pump system for residential applications was carried out with heat pump operating temperature, outdoor temperature and solar radiation. As a result, collector operating time is decreased by 1.5 hours due to the increase of water temperature in the heat storage tank when the heat pump operating temperature rises. Heat pump operating time is reduced by 19.4% owing to the high temperature of a heat storage tank. Besides, indoor heating time is decreased from 10.3 to 5.5 hours as the indoor temperature increases from <TEX>$3^{\circ}C$</TEX> to <TEX>$11^{\circ}C$</TEX>. In addition to, when the solar radiation rises from 10 to 20 MJ/<TEX>$m^2$</TEX>, the maximum outlet temperature of a solar collector is increased from <TEX>$65^{\circ}C$</TEX> to <TEX>$71^{\circ}C$</TEX>.
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