| This paper focused on a novel type Indirect Expansion Solar Assisted Multifunctional Domestic Heat Pump system (IESA-MDHP) , and theoretical and experimental investigations were carried on the system. IESA- MDHP is an integration of a solar collector and a multi-functional heat pump. The system can not only operate as a solar collector to output hot water in sunny days, but also heating water in cloudy or rainy days with heat pump. When heat pump works in space cooling mode the device may utilize discharged heat to produce hot water. Except supplying hot water for domestic usage the device can operate for space heating in cold days. With solar energy input the evaporator temperature is lifted comparing to an ordinary heat pump, thus frosting on the evaporator can be effectively reduced in space heating condition in cold days. Accommodated to weather variation and the needs of the consumer IESA-MDHP can operate in space heating with solar energy or air-sources, producing hot water with solar energy or air-sources, space cooling simultaneously supplying hot water and space cooling mode only separately.Firstly an experimental rig was designed and established. It was consisted of the system equipment and the measurements. And the system equipment also consisted of solar collector and multifunction heat pump. Experiments were taken in space heating with solar energy mode and supplying hot water with solar energy mode to IESA-MDHP. The coefficient of performance (COP) was studied with the variations of environment parameters, solar collector efficiency and the parameters of the heat pump.Secondly a mathematical model was constructed on IESA-MDHP based on the available component models. Simulation was taken on IESA-MDHP system with the measured weather data of one day in Hefei City.At last an exergy analysis was given to IESA-MDHP based on the Second Law of the thermal dynamics. Maximum exergy loss was referred according to the theoretical analysis.
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