Carbon dioxide overlapping-type commercial refrigeration system

Abstract

The invention discloses a carbon dioxide overlapping-type commercial refrigeration system. The system is characterized in that a high-temperature stage loop and a low-temperature stage loop constitute an overlapping-type refrigeration loop; a plurality of refrigeration compressors connected in parallel are respectively arranged in the high-temperature stage loop and low-temperature stage loop; the high-temperature stage loop adopts an R404A, R134a, R717 or R410A environment-friendly refrigerant; and the low-temperature stage loop uses a natural working medium R744. The system has the advantages of high safety and reliability and energy saving, is convenient to operate and control, and can provide a refrigeration, freezing or quick-freezing cold source for food production, storage and transportation, and marketing enterprises.

Description

Technical field [0001] The invention relates to a refrigeration system, in particular to a commercial cascade refrigeration unit using carbon dioxide as a low-temperature refrigeration working medium. Background technique [0002] Commercial cascade refrigeration units are widely used in the production, processing, storage and sales of agricultural and sideline products, and play an important role in food quality and freshness, avoiding or reducing food loss in circulation, and ensuring food safety. Modern supermarkets have built large-volume cold storage and freezer storage and large-scale cold storage and freezing display sales areas. Large, medium and small logistics companies have built thousands to hundreds of thousands of tons of cold storage and freezer storage, modern food processing Enterprises have built refrigerated and frozen processing workshops and storage warehouses. With the rapid development of China's economy and the advancement of urbanization, the demand for ...

AI Technical Summary

Problems solved by technology

At present, the manufacturing level of commercial refrigeration units in my country is relatively backward compared with developed countries such as the United States, Europe, Japan, etc., which is mainly reflected in energy saving, environmental protection and reliability; Most of the commercial refrigeration equipment currently in service in manufacturing enterprises, shopping malls, supermarkets and other circulation enterprises use Freon refrigerants with poor environmental performance. The disadvantages of large refrigerant charge and low energy efficiency of refrigeration units are very prominent.

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