Environment-friendly mixed working medium, composition, and heat exchange system

Abstract

The invention provides an environment-friendly mixed working medium which is composed of four components including, by mass, 4%-72% of a first component, 4%-76% of a second component, 4%-44% of a third component and 4%-76% of a fourth component, and the mass ratio is based on the total mass of the environment-friendly mixed working medium; wherein the first component is trifluoromethyl iodide (R13I1); the second component is 3, 3, 3-trifluoropropene (R1243zf); the third component is one of 1, 1, 1, 2-tetrafluoroethane (R134a) and 1, 1, 1, 2, 3, 3, 3-heptafluoropropane (R227ea), and the fourthcomponent is any one of 2, 3, 3, 3-tetrafluoropropene (R1234yf), 1, 1-difluoroethane (R152a) and trans-1, 3, 3-tetrafluoropropene (R1234ze (E)); the GWP of the refrigerant, namely the environment-friendly mixed working medium, is smaller than or equal to 600, the ODP is 0, the refrigerant has low flammability or incombustibility, and the problems that an existing refrigerant replacing R134a is weak in flammability and low in system refrigerating capacity can be solved.

Description

technical field [0001] The invention relates to a refrigerant technology, in particular to an environment-friendly mixed working medium, a composition and a heat exchange system. Background technique [0002] With the increasingly serious trend of environmental protection, for the "greenhouse effect" of HFCs, international contracts such as the Montreal Protocol and the Kyoto Protocol require signatory countries to gradually reduce and eventually ban the refrigerant R134a, and at the same time propose higher alternatives to it. Environmental protection requirements, in addition to requiring new refrigerants to have no damaging effect on the ozone layer, also require new refrigerants to have as low a GWP value as possible. At present, R134a refrigerant is widely used in large air-conditioning centrifugal chillers, screw units, automotive air conditioners, etc. Its GWP is 1300 and ODP is 0. It is necessary to find a low-GWP working fluid to replace it. R1234yf can replace R13...

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Problems solved by technology

[0003] In view of this, the present invention provides an environmentally friendly mixed working fluid, whose GWP is less than or equal to 600, ODP is 0, has obvious environmental protection advantages, and has good thermal performance, which can not only solve the problem of the flammability of existing refrigerants that replace R134a problems, while solving the problem of low cooling capacity of the system

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