Trans-critical carbon dioxide refrigeration method and device thereof

Abstract

The invention discloses a trans-critical carbon dioxide refrigeration method and a device thereof. The method comprises the following steps that (1) superheated carbon dioxide steam is pressurized forprimary compression and primary cooling; (2) subcritical carbon dioxide is subjected to secondary compression and secondary cooling; (3) after supercritical carbon dioxide is cooled again, the supercritical carbon dioxide is throttled to be low-temperature subcritical carbon dioxide; (4) the throttled low-temperature subcritical carbon dioxide is sent to an evaporation tank to be evaporated intohigh-temperature low-pressure carbon dioxide gas; and (5) the high-temperature low-pressure carbon dioxide gas absorbs heat and then is converted into superheated carbon dioxide steam, and is fed intoa first compressor for boosting for cyclic utilization. According to the trans-critical carbon dioxide refrigeration method and the device thereof, an expansion machine is used for recycling and outputting mechanical energy to drive a compressor to complete compression, a double-compressor is used for improving the compression performance of the supercritical carbon dioxide, and a double-gas cooler and an internal regenerator are used for cooling the carbon dioxide gas so as to improve the cycle energy efficiency of the carbon dioxide.

Description

technical field

[0001] The invention relates to the technical field of refrigeration, in particular to a transcritical carbon dioxide refrigeration method and a device thereof. Background technique

[0002] Existing refrigerants have adverse effects on the environment, mainly in the destruction of the ozone layer and the greenhouse effect. The destruction of the ozone layer and the greenhouse effect are manifested in the continuous reduction of ozone content and the continuous increase of greenhouse gas concentration, which will have a huge impact on the environment in which humans live, and even have serious consequences. while CO 2 As a natural refrigerant is a safe choice, in the field of refrigeration technology, due to CO 2 It is considered to be the most potential long-term substitute for CFCs, HCFCs and HFCs. Due to the natural working substance CO 2 With its good environmental protection characteristics, excellent heat transfer characteristics and considerable co...

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