An environment-friendly hydrocarbon mixed refrigerant replacing r134a and its application

Abstract

The invention belongs to the technical field of refrigerants, and in particular relates to an environment-friendly hydrocarbon mixed refrigerant replacing R134a and its application. The hydrocarbon mixed refrigerant comprises the following components in mass percentage: 36%-39% of propylene (R1270), and 61%-64% of isobutane (R600a). Compared with R134a, the hydrocarbon mixed refrigerant of the present invention has the characteristics of low adiabatic index, and can reduce exhaust temperature, increase gas transmission coefficient, reduce irreversible loss in compression process, and improve energy efficiency of the system under the same pressure ratio. The hydrocarbon mixed refrigerant provided by the present invention can be directly used as a substitute refrigerant for R134a, is applicable to most system equipment in the field of refrigeration, and can effectively solve the replacement problem of high-GWP refrigerants.

Description

Technical field [0001] The present invention belongs to the field of refrigerant technology, specifically relates to an environmentally friendly hydrocarbon hybrid refrigerant alternative to R134a and its applications. Background [0002] At present, R134a is widely used in refrigeration systems such as automotive air conditioners, refrigerators, and freezers because of its non-toxicity, non-flammability, non-destructive to the ozone layer, and excellent thermal properties. However, in today's increasing emphasis on environmental issues, the use of R134a is gradually being increasingly limited by its high global warming potential. In 2004, the European Union stipulated that since 2011, the GWP value of the refrigerant used in the newly launched car air conditioning systems in EU countries must be less than 150, and from 2017, it will ban the use of refrigerants with a GWP value greater than 150 in the car air conditioning system; in addition, the Kyoto Protocol also lists R134a a...

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Problems solved by technology

[0004] Patent Nos. CN 109762526 A and CN 109810674 B respectively propose different ternary mixed refrigerants as alternative refrigerants, and their temperature glides are small, and their thermophysical properties are similar to R134a, so they can be directly used as alternative refrigerants. Filling, however, the components of the two ternary mixed refrigerants contain R134a, which cannot be completely replaced

[0005] The mixed refrigerants disclosed in the patents CN 111004610 A and CN 109722226 A have high energy efficiency in the refrigeration system, and their working pressure is similar to that of R134a. However, the mixed refrigerants all have the problem of high pressure ratio , the compressor discharge temperature has not improved, and the GWP value is far from the EU standard, still at a relatively high level

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