e widely used in the application of air conditioning in the future.epilogueIn short, human beings enjoy the comfortable life brought by scientific and technological progress regardless of the consequences, but forget the environmental pollution caused by it, which will affect future generations. In the face of deteriorating environmental problems, it is an urgent problem for refrigeration technology to ensure the basic refrigeration needs of air conditioning, reduce harmful gas emissions and save energy. The breakthrough and innovation of air conditioning and refrigeration technology is related to the future of home appliance industry and the earth environment on which people live.