Solar absorption and injection combination trans-critical CO2 refrigeration system

Abstract

The invention discloses a solar absorption and injection combination trans-critical CO2 refrigeration system. The solar absorption and injection combination trans-critical CO2 refrigeration system comprises a trans-critical CO2 refrigeration cycle and a solar absorption and injection double-supercooler mechanical supercooling cycle. The solar absorption and injection double-supercooler mechanicalsupercooling cycle achieves ladder supercooling operation with two different evaporation pressures through two-time throttling depressurization, and therefore CO2 fluid in an outlet of a CO2 gas cooler of the trans-critical CO2 refrigeration cycle can be subjected to continuous two-time ladder supercooling operation, the better temperature matching state can be formed in the heat exchange process,the heat transfer temperature difference is reduced, the heat exchanger irreversible loss in the CO2 supercooling process is remarkably reduced, the outlet temperature of the gas cooler is reduced, the throttling loss of CO2 is reduced, the compression ratio of a compressor can be reduced, the isentropic efficiency of the compressor is improved, and the whole COP of the system is improved. The solar absorption and injection combination trans-critical CO2 refrigeration system can be widely applied to the occasions which needs to be refrigerated, such as the refrigeration and cold storage occasion and the low-temperature storage occasion.

Description

technical field [0001] The invention relates to the technical field of absorption refrigeration and heat pump, in particular to a solar energy absorption and injection composite transcritical CO 2 Cooling System. Background technique [0002] As global warming and the destruction of the ozone layer become increasingly serious, the refrigeration and air-conditioning industry needs to seek environmentally friendly refrigerants to replace HFCs, HCFCs and other working fluids that damage the ozone layer and cause greenhouse effects. Substitution of refrigerants and environmental issues have naturally become the focus of attention in the refrigeration and air-conditioning industry. Among them, the natural working substance CO 2 It is an environmentally friendly natural working fluid that is non-toxic, non-flammable, rich in sources, and has a large cooling capacity per unit volume. It has attracted widespread attention because of its ODP=0 and extremely low GWP. Due to CO 2 T...

AI Technical Summary

Problems solved by technology

due to CO 2 The lower critical temperature (31.1°C) and higher critical pressure (7.38MPa) make it throttling with large irreversible loss and low refrigeration efficiency

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