Energy-efficient cascade air-source heat pump system

Aiming at the initiating difficulties, poor indoor heating effect and high energy loss of an air-source heat pump heating system in low temperature conditions, presents the cascade air-source heat pump system by introducing the phase change thermal storage equipment. Expounds the operating principle and analyses the operating characteristics in low temperature conditions. As a result, the heating performance is improved by the double stage coupling heat pump technology, and the energy shortage is overcome.