Influence factors and optimization tests for low temperature start-up of air-source heat pumps

Air-source heat pump has many problems such as long heating time, large power consumption and poor comfort when restarting after shutdown and cooling down in winter. Analyses the influence factors of low temperature start-up of air-source heat pump with theory and experiment test, and provides an optimal program of transferring the refrigerant to indoor double-pipe heat exchanger and improving control mode in start preheating period.