CN-121991639-A - Low GWP (global warming potential) replacement refrigerant of R134a, preparation method and application thereof

Abstract

The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP (global warming potential) substitution refrigerant of R134a, a preparation method and application thereof. The alternative refrigerant is a mixture comprising, by weight, 45-55 parts of difluoromethane (R32), 8-12 parts of ‌, 1-difluoroethane (R152 a) ‌, and 36-44 parts of hexafluoropropene (R1216). The refrigerant has the characteristics of good environmental protection, high refrigerating capacity per unit volume, small temperature slippage and excellent thermodynamic performance, and is particularly suitable for direct substitution of a refrigerating system without modifying the prior equipment.

Inventors

• WANG ZHIGUO
• LIU JINGJING
• LIU YE
• ZHANG LI

Assignees

• 湖北瑞能华辉能源管理有限公司
• 西安交通大学

Dates

Publication Date

20260508

Application Date

20251218

Claims (10)

1. 1. The low GWP replacement refrigerant for R134a is characterized by comprising, by weight, 45-55 parts of difluoromethane, 8-12 parts of ‌, 1-difluoroethane ‌ and 36-44 parts of hexafluoropropene.
2. 2. The low GWP replacement refrigerant for R134a according to claim 1, comprising 50 to 55 parts by weight of difluoromethane, 10 to 12 parts by weight of ‌, 1-difluoroethane ‌,40 to 44 parts by weight of hexafluoropropene.
3. 3. The low GWP replacement refrigerant for R134a according to claim 1, comprising 50 to 55 parts by weight of difluoromethane, 8 to 10 parts by weight of ‌, 1-difluoroethane ‌,36 to 39 parts by weight of hexafluoropropene.
4. 4. The low GWP replacement refrigerant for R134a according to claim 1, comprising 45 to 49 parts by weight of difluoromethane, 10 to 12 parts by weight of ‌, 1-difluoroethane ‌,40 to 44 parts by weight of hexafluoropropene.
5. 5. The low GWP replacement refrigerant for R134a according to claim 1, comprising 45 to 49 parts by weight of difluoromethane, 8 to 10 parts by weight of ‌, 1-difluoroethane ‌,36 to 39 parts by weight of hexafluoropropene.
6. 6. The low GWP replacement refrigerant for R134a according to claim 1, comprising 55 parts by weight of difluoromethane, 12 parts by weight of ‌, 1-difluoroethane ‌,44 parts by weight of hexafluoropropene.
7. 7. The low GWP replacement refrigerant for R134a according to claim 1, comprising 50 parts by weight of difluoromethane, 10 parts by weight of ‌, 1-difluoroethane ‌,40 parts by weight of hexafluoropropene.
8. 8. The low GWP replacement refrigerant for R134a according to claim 1, comprising 45 parts by weight of difluoromethane, 8 parts by weight of ‌, 1-difluoroethane ‌,36 parts by weight of hexafluoropropene.
9. 9. A method for preparing a refrigerant with low GWP for R134a according to any one of claims 1 to 8, comprising the steps of injecting difluoromethane, 1-difluoroethane and hexafluoropropylene in a gas phase or liquid phase according to the weight ratio into a pressure-resistant container at normal temperature, mixing uniformly in a liquid phase state by a physical mixing method, and standing to obtain the refrigerant with near azeotropy.
10. 10. Use of a low GWP replacement refrigerant for R134a according to any of claims 1 to 8 for replacing R134a refrigerant in an air cooled system, a water cooled system or a heat pump system in a refrigeration system.

Description

Low GWP (global warming potential) replacement refrigerant of R134a, preparation method and application thereof Technical Field The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP (global warming potential) substitution refrigerant of R134a, a preparation method and application thereof. The refrigerant has a low Global Warming Potential (GWP), high energy efficiency and good system compatibility, and is suitable for direct substitution of R134a. Background The R134a refrigerant is an HFC mixed refrigerant widely used in air-conditioning and heat pump systems, and the component of the refrigerant is tetrafluoroethane. Although R134a has excellent refrigerating performance, its GWP value is high (about 1430). In addition, R32 alone has low GWP (about 675), but has light flammability (A2L safety level) and high exhaust gas temperature, R152a alone has high flammability (A2 safety level) and poor refrigerating efficiency, and R1216 (hexafluoropropylene) alone has very low GWP (< 1), but has large difference in thermophysical properties from R134a and poor system compatibility. The existing substitutes such as R290, R1234yf, R410A and the like have the problems of flammability, increase in GWP, obvious reduction of refrigerating performance and the like although the existing substitutes are improved in GWP or safety. Accordingly, the development of an alternative refrigerant that is low GWP, high performance, safe, and compatible with the R134a system is an urgent need in the air conditioning industry. The invention aims to provide a novel mixed refrigerant, the GWP value of which is significantly lower than that of R134a, and meanwhile, similar thermodynamic performance and operation characteristics are maintained, and the mixed refrigerant is specially optimized for a refrigeration system. Disclosure of Invention In order to solve the defects of the prior art, the invention provides a low GWP (global warming potential) substitution refrigerant of R134a, and a preparation method and application thereof. The refrigerant has the advantages of excellent environmental protection, high refrigeration efficiency and good safety. The technical scheme provided by the invention is as follows: A low GWP substitute refrigerant of R134a comprises 45-55 parts by weight of difluoromethane (R32), 8-12 parts by weight of ‌, 1-difluoroethane (R152 a) ‌,36-44 parts by weight of hexafluoropropene (R1216). Based on the technical scheme: compared with the existing R134a refrigerant, the refrigerant provided by the invention has the advantages that the global warming potential is greatly reduced by about 24% -35%, and the refrigerating capacity per unit volume and COP are equivalent or slightly excellent; Compared with ‌, 1-difluoroethane used alone, the refrigerant provided by the invention has the advantages of higher safety (the combustibility is inhibited by adding R1216); Compared with hexafluoropropylene which is singly used, the refrigerant provided by the invention has the advantages of higher refrigeration performance, better system compatibility and no need of large-scale reconstruction of the existing R134a system. Preferably, the low GWP replacement refrigerant for R134a comprises 50-55 parts by weight difluoromethane, 10-12 parts by weight ‌, 1-difluoroethane ‌,40-44 parts by weight hexafluoropropylene. Preferably, the low GWP replacement refrigerant for R134a comprises 50-55 parts by weight difluoromethane, 8-10 parts by weight ‌, 1-difluoroethane ‌,36-39 parts by weight hexafluoropropene. Preferably, the low GWP replacement refrigerant for R134a comprises 45-49 parts by weight difluoromethane, 10-12 parts by weight ‌, 1-difluoroethane ‌,40-44 parts by weight hexafluoropropylene. Preferably, the low GWP replacement refrigerant for R134a comprises 45-49 parts by weight difluoromethane, 8-10 parts by weight ‌, 1-difluoroethane ‌,36-39 parts by weight hexafluoropropene. More preferably, the low GWP replacement refrigerant for R134a comprises 55 parts by weight difluoromethane, 12 parts by weight ‌, 1-difluoroethane ‌,44 parts by weight hexafluoropropene. More preferably, the low GWP replacement refrigerant for R134a comprises 50 parts by weight difluoromethane, 10 parts by weight ‌, 1-difluoroethane ‌,40 parts by weight hexafluoropropene. More preferably, the low GWP replacement refrigerant for R134a comprises 45 parts by weight difluoromethane, 8 parts by weight ‌, 1-difluoroethane ‌,36 parts by weight hexafluoropropene. The specific low GWP replacement refrigerant of R134a is any combination of the following cases: The parts of difluoromethane are 45, 46, 47, 48, 49, 50, 51, 52, 53, 54 or 55; the part ‌ of the 1, 1-difluoroethane is 8, 9, 10, 11 or 12; the number of parts of hexafluoropropylene is 36, 37, 38, 39, 40, 41, 42, 43 or 44. The invention also provides a preparation method of the low GWP substitution refrigerant of R134a, which comprises the following steps: accor