Performance analysis of a hybrid solar airsource heat pump for space heating

Presents the principles of a hybrid solar airsource heat pump system. It supplies heat by solar collector when solar energy is abundant. It takes heat by means of aircooled heat exchanger when no solar energy at night, provides the heat pump evaporator with heat by a cold load agent and makes hot water by using the heat pump. When solar radiation is weak, it uses the solar thermal collector and aircooled heat exchanger to heat the cold load agent, and leads the agent into the heat pump evaporator to make full use of solar energy for increasing the evaporating temperature. The heat exchanger is set between the aircooled heat exchanger and the heat pump condenser. The hot water made by the heat pump is used to defrost for the aircooled heat exchanger. That can reduce energy consumption for defrosting and ensure the continuity of heating. Taking a case in Beijing as an example, the results show that the system energy efficiency is 1.13 when it is used for winter heating, which is higher than those of solar energy collector plus electric heating system and airsource heat pump system. The energy saving rate of the hybrid solar airsource heat pump system reaches 58%, relative to the solar energy collector plus electric heating system.