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 Co2 Refrigeration Compressor Rack Secondary 2 Stage

The subcritical refrigeration cycle of CO2 is same as steam compression refrigeration cycle, both the suction and discharge pressure are lower than critical pressure of CO2 and evaporating pressure and condensing pressure are lower than critical temperature. The suction and discharge of heat are under the critical conditions, heat exchange is mainly based on latent heat, and is used to low temperature stage of cascade freezer.

CO2 as low temperature stage has the following advantages:

1、Evaporating temperature of CO2 is below -50C , which has sufficient evaporating pressure. It can reach de demand of food freezing without negative pressure inside evaporator.

2、CO2 refrigerant is characterized by safety, non-toxicity and incombustibility and its molecular mass is bigger than air, so its cycle can refer to Freon refrigeration system

3、CO2 is nature working media, and it has little effect on environment.

4、Compared with other refrigerants, even under low temperature,CO2 has little viscosity and better heat transfer performance. It has larger latent heat of evaporation, large refrigerating capacity per unit of swept volume and high heat emission coefficient;