Abstract: With the increasing attention of the world to environmental problems, R22 refrigerant products in heat pump industry have been gradually reduced in use, and mainstream refrigerants such as R134a and R410A have been included in the scope of controlled substances. The use of lower GWP refrigerants has become an important support for the sustainable development of heat pump industry. Respectively analyze the application of low GWP refrigerants in three main subdivisions of heat pump industry, high temperature heat pump, ordinary heat pump and low temperature heating; and the possible refrigerant replacement situation in the medium and long term is proposed. At the same time, two typical refrigerants, R290 and CO₂, which are suitable for heat pump industry are discussed, and their future development trend is analyzed. The development of new heat pump products with low GWP refrigerants (including natural refrigerants) which are suitable for China's national conditions and have advantages in international competition will be the follow-up development direction of the industry.

Key words: Refrigerant, GWP, Heat pump, Temperature, Pressure