Partial cascade type CO2 trans-critical two-stage compression refrigeration system for commercial supermarkets

Abstract

The invention discloses a partial cascade type CO2 trans-critical two-stage compression refrigeration system for commercial supermarkets. Refrigerant liquid for a partial cascade supercooling refrigeration system enters compressors, a condenser, throttle valves and a cooling evaporator to complete refrigeration successively through pipelines, which is used for supercooling the CO2 trans-critical two-stage compression refrigeration system to increase the refrigerating capacity and improve the system performance. The CO2 trans-critical two-stage compression refrigeration system comprises a low temperature evaporator, a medium temperature evaporator, a low temperature compressor, a high temperature compressor, a parallel compressor, a hot-water heater, an air heat exchanger, a gas cooler, thecooling evaporator, a high pressure throttle valve, an air conditioner, an intercooler, a bypass-valve, a medium pressure throttle valve and a low pressure throttle valve. The coupling of the two systems can realize the combination of various refrigeration and heating requirements of the commercial supermarkets, and the problem of low performance coefficient of a CO2 refrigerant used in the commercial supermarket refrigeration system is solved. Meanwhile, the safety of the system is ensured, and the efficiency of energy utilization is effectively improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a partially cascaded supercooled CO 2 Two-stage compression refrigeration system. Background technique [0002] In recent years, in response to environmental security issues, with the joint efforts of the international community, developed countries and some developing countries have made corresponding commitments to control the destruction of the ozone layer and the greenhouse effect, among which high "ODP" and high "GWP" refrigerants Production and application are strictly limited. At present, the HCFC refrigerants used in large quantities will be reduced to maintenance volume before 2030, and some HFC refrigerants may become intermediate transition products. The researchers concluded that there are two technical routes to solve the technical solution of refrigerant application. The first technical route is to continue to develop artificial refrigerants with zero "ODP" ...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a CO 2 Transcritical two-stage compression refrigeration system solves the problems of low energy utilization rate and low system efficiency in the prior art

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