Novel air-source heat pump system with external heat source auxiliary heating

Air-source heat pump frequently defrosts at the condition of low temperature and high humidity, and cannot continue heating during defrosting, which resulting in poor indoor thermal comfort. Presents a novel air-source heat pump system with external heat source auxiliary heating. The experimental results show that at the operating condition of -7 ℃/-8 ℃ of outside wet and dry bulb temperature, the continual heating operation time is up to 594 min, 195% longer than that of the conventional system, and the supply air with temperature no lower than 38 ℃ is still provided during the defrosting, which greatly improves the comfort experience.