Solar-assisted; Heat pump; Multi-functional; COP; Exergy
Solar Toceranib is clean and sustainable energy resource. Due to the rising cost of conventional energy and growing concern about global warming, many studies have focused on the application of solar energy in daily life. In particular, by combining heat pump and solar energy, solar-assisted heat pump has become an effective energy-saving equipment , ,  and . According to the connecting mode of solar collector and evaporator, solar-assisted heat pump can be classified as: the indirect expansion solar-assisted heat pump and the direct expansion solar-assisted heat pump .
In previous studies, Jiang et al.  and Cho et al.  simulated the indoor environment temperature by constant temperature water bath, and measured the inlet and outlet temperature of the water cooled heat exchanger to calculate the heating capacity in the space heating mode. However, the heat transfer performance in the water cooled heat exchanger is different from segregation in the air cooled heat exchanger. Because the measurement of the heating capacity in the space heating mode is difficult to obtain, most previous studies have focused on the water heating mode ,  and .