Environmental protection type refrigerant for replacement of R502

Abstract

The invention discloses an environment-friendly refrigerant for replacing R502. The refrigerant consists of three components: fluoroethane (HFC-161), pentafluoroethane (HFC-125) and trifluoroethane (HFC-143a). The preferred mass percentages are: HFC-161: 1%-30%, HFC-125: 35%-65%, HFC-143a: 5%-64%. The ODP value of the refrigerant is zero, which does not destroy the atmospheric ozone layer. The working pressure and pressure ratio of this refrigerant are similar to those of R502. On the premise of not changing the main components of the system, its thermal performance such as refrigerating capacity per unit mass and exhaust temperature are better than those of R502. It can be used as a long-term substitute for R502, and Filling can be reduced.

Description

technical field [0001] The invention relates to a refrigerant, in particular to an environment-friendly refrigerant replacing R502. technical background [0002] R502 is a binary azeotropic mixture formed by mixing HCFC-22 and CFC-115 at a mass percentage of 48.8% and 51.2%, and its boiling point is -45.4°C. Due to its good physical, chemical and thermodynamic properties, it has been widely used at home and abroad since the 1960s. As a medium-temperature refrigerant with good performance, R502 has been widely used in cold storage, freezer and flat-panel freezer and other low-temperature refrigeration equipment. [0003] The components of R502 contain a large amount of CFC-115. According to the provisions of the Montreal Agreement and its amendments, CFC-115 belongs to the first batch of prohibited substances. Developed countries have already eliminated it before 1996. Another component, HCFC- 22 Although the ODP value is small, it still has a certain de...

AI Technical Summary

Problems solved by technology

However, it should be noted that the above-mentioned refrigerants still have certain defects, that is, although the ODP values ​​of these alternative refrigerants are all 0, they still have relatively high GWP values, which are not compatible with the current environment for controlling greenhouse gas emissions.

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