Carbon dioxide refrigerating system and refrigerating method thereof

Abstract

The invention relates to a carbon dioxide refrigerating system and a refrigerating method thereof. The carbon dioxide refrigerating system comprises a compressor, a condenser, a liquid storage deviceand an evaporator which communicate in sequence, wherein a suction assembly is arranged between the compressor and the condenser; the suction assembly communicates with the liquid storage device or agas-liquid separator; the gas-liquid separator is arranged between the condenser and the liquid storage device; and carbon dioxide gas in the liquid storage device or the gas-liquid separator can be pumped back into a pipeline between the compressor and the condenser through the suction assembly. The carbon dioxide refrigerating system has the beneficial effects that the gas and liquid can be effectively separated, and part of the liquid can be flashed to subcool the carbon dioxide; the flash evaporation type condenser can achieve a refrigerating effect through radiation, and aerosol is formedin a cavity, so that the evaporation and the cooling are rapid and the refrigerating efficiency is increased; and the refrigerating system is simple in structure, convenient to operate and low in installation and maintenance costs.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to a carbon dioxide refrigeration system and a refrigeration method thereof. Background technique [0002] In the field of refrigeration, Freon is mostly used as refrigerant at home and abroad at present, but Freon will destroy the ozone layer of the atmosphere, resulting in a higher greenhouse effect. Ammonia (R717) is not an economical and safe refrigerant because of its instability and high cost, and it will also cause unsafe factors in the refrigeration system. As the international community pays more and more attention to energy conservation, emission reduction and environmental protection, the phase-out of Freon refrigerants is also accelerating. As a safe and environmentally friendly refrigerant, carbon dioxide has broad application prospects and considerable economic value. . However, due to the inherent characteristics of carbon dioxide, when the working temperature is higher th...

AI Technical Summary

Problems solved by technology

Although these improvements can improve the energy efficiency performance of the carbon dioxide side refrigeration system to a certain extent, the system structure is complicated, the cost is high, it is difficult to debug and maintain, and the overall refrigeration system efficiency is still very low; It is necessary to add other refrigerants (such as freon) to maintain the normal operation of the system, which neither can make full use of the advantages of natural working medium carbon dioxide as a refrigerant nor is it conducive to environmental protection

[0004] In summary, based on the characteristics of carbon dioxide refrigerants, extensive research has been carried out. Since different regions have different temperature and humidity, and there is a huge difference between winter and summer, there is still a technical bias, when the ambient temperature is higher than the critical value of carbon dioxide When the carbon dioxide refrigeration system is difficult to use for large-scale refrigeration

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