Study On A New-type Refrigerator With Compression-ejection Hybrid Refrigeration Cycle

Since the innovation and opening policy, Chinese people are living a better and better life. Home appliances such as refrigerator are getting a rapid development. There is an increasing demand for refrigerators both in country and city. In the near future, the electricity-consuming of refrigerators will be greater and greater. So the energy-saving for refrigerators will be an important task.The study of a new-type household refrigerator with compression-ejection hybrid refrigeration cycle which uses R134a as refrigerant is carried out in this essay. It only adds an ejector which has a very simple configuration and has no movement parts to the traditionnal steam compression cycle. The ejector can reclaim part of the throttle loss and increase the compressor inspiration pressure, so it can effectively raise the COP and improve the work condition for compressor.The essay presents the distributed steady models for compressor, condenser, evaporator, capillary and the thermodynamic model for ejector which based on the theory of isotonic hybrid and momentum conservation, introduces the calculation method of R134a parameters, programs with VB, studys on the performances of the system and ejector that vary with the work condition and the demands of ejector size under different work condition. Through research, some conclusions such as the relations between cooling capacity, COP and entrainment ratio, evaporation temperature of cooling chamber and freezing chamber, condension temperature are received. It hoped that the research can have some contribution to the exploitation of this new-type refrigerator and offer guidances for the optimization and matching of the system.