CN-121975492-A - Low GWP refrigerant for replacing R410A, preparation method and application thereof

Abstract

The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP refrigerant for replacing R410A, a preparation method and application thereof. The substitute refrigerant is near azeotropic mixture and comprises 55-65 parts by weight of difluoromethane (R32), 30-40 parts by weight of ‌,1, 2-pentafluoroethane (R125) ‌ and 1-10 parts by weight of n-butane (R600). Compared with R410A, the GWP value of the refrigerant is obviously reduced, the sliding temperature of the refrigerant is lower, the environment friendliness is obviously improved, the refrigeration performance is excellent, and the thermodynamic characteristics are well matched.

Inventors

• LIU YE
• LIU JINGJING
• 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

20260505

Application Date

20260123

Claims (10)

1. 1. The low GWP refrigerant for replacing R410A is characterized by comprising, by weight, 55-65 parts of difluoromethane, 30-40 parts of ‌,1, 2-pentafluoroethane ‌ and 1-10 parts of n-butane.
2. 2. The refrigerant with low GWP for replacing R410A according to claim 1, comprising the components of 55 to 60 parts by weight of difluoromethane, 30 to 35 parts by weight of ‌ parts by weight of 1, 2-pentafluoroethane ‌, and 1 to 5 parts by weight of n-butane.
3. 3. The refrigerant with low GWP for replacing R410A according to claim 1, comprising the components of 55 to 60 parts by weight of difluoromethane, 36 to 40 parts by weight of ‌,1, 2-pentafluoroethane ‌,6 to 10 parts by weight of n-butane.
4. 4. The refrigerant with low GWP for replacing R410A according to claim 1, comprising 61-65 parts by weight of difluoromethane, 30-35 parts by weight of ‌,1, 2-pentafluoroethane ‌,1-5 parts by weight of n-butane.
5. 5. The refrigerant with low GWP for replacing R410A according to claim 1, comprising 61-65 parts by weight of difluoromethane, 36-40 parts by weight of ‌,1, 2-pentafluoroethane ‌,6-10 parts by weight of n-butane.
6. 6. The refrigerant of claim 1 wherein the low GWP refrigerant for replacing R410A comprises 56 parts by weight of difluoromethane, 32 parts by weight of 1, 2-pentafluoroethane and 3 parts by weight of n-butane.
7. 7. The refrigerant of claim 1 wherein the low GWP refrigerant for substitution of R410A comprises, by weight, 60 parts difluoromethane, 35 parts 1, 2-pentafluoroethane, 5 parts n-butane.
8. 8. The refrigerant of claim 1 wherein the low GWP refrigerant for replacing R410A comprises, by weight, 64 parts difluoromethane, 38 parts 1, 2-pentafluoroethane, and 7 parts n-butane.
9. 9. A method for preparing the refrigerant with low GWP for replacing R410A according to any one of claims 1 to 8, comprising the steps of injecting difluoromethane, ‌ 1, 2-pentafluoroethane and n-butane in a gas phase or liquid phase into a pressure-resistant container according to the weight ratio, mixing uniformly in a liquid phase state by adopting a physical mixing method, and standing to obtain the refrigerant with low GWP for replacing R410A near azeotropy.
10. 10. The use of a low GWP refrigerant replacing R410A according to any one of claims 1 to 8 for replacing R410A refrigerant in an air conditioning system comprising an air cooled system, a water cooled system or a heat pump system.

Description

Low GWP refrigerant for replacing R410A, preparation method and application thereof Technical Field The invention belongs to the technical field of refrigerants, and particularly relates to a low GWP refrigerant for replacing R410A, a preparation method and application thereof. Background The R410A refrigerant is an HFC mixed refrigerant widely used for air-conditioning and heat pump systems, and has a main component of 50% R32 (difluoromethane) and 50% R125 (pentafluoroethane). Although R410A has excellent refrigerating performance, the GWP value of the refrigerant is high (about 2088), and the refrigerant is subject to elimination pressure of environmental protection regulations such as 'Kiril amendment'. In addition, R32 alone has low GWP (about 675), but has slight flammability (A2L safety class) and high exhaust temperature, R125 alone has extremely high GWP (about 3500) and poor refrigerating efficiency, R600 (n-butane) alone has extremely low GWP (20), but has potential safety hazard due to extremely flammability, and has large difference between thermophysical properties and R410A and poor system compatibility. Existing substitutes such as R32, R452B and R454B have the problems of limited flammability, limited GWP reduction, large temperature slippage and the like, although the existing substitutes are improved in terms of GWP or safety. Accordingly, the development of an alternative refrigerant that is low GWP, high performance, safe, and compatible with the R410A system is an urgent need in the air conditioning industry. The invention aims to provide a novel near-azeotropic mixed refrigerant, the GWP value of which is obviously lower than R410A, and meanwhile, similar thermodynamic performance and operation characteristics are maintained, and the refrigerant is specially optimized for an air conditioning system. Disclosure of Invention In order to solve the defects of the prior art, the invention provides a low GWP refrigerant for replacing R410A of an air conditioning system, a preparation method and application thereof. Compared with R410A, the GWP value of the refrigerant is obviously reduced, the sliding temperature of the refrigerant is lower, the environment friendliness is obviously improved, the refrigeration performance is excellent, the thermodynamic characteristic is well matched, and the refrigerant has the advantages of excellent environment friendliness, high refrigeration efficiency and good safety. The method is suitable for direct replacement of an air conditioning system, and the existing equipment is not required to be modified. The technical scheme provided by the invention is as follows: A refrigerant with low GWP for replacing R410A comprises 55-65 parts by weight of difluoromethane (R32, CH 2F2), 30-40 parts by weight of ‌,1, 2-pentafluoroethane ‌ ‌ (R125, CHF 2CF3), 1-10 parts by weight of n-butane (R600, CH 3CH2CH2CH3). Based on the technical scheme: compared with the prior HFC-410A refrigerant, the refrigerant provided by the invention has the advantages that the global warming potential is greatly reduced by about 20%, and the refrigerating capacity per unit volume is equivalent or slightly excellent in COP; compared with single use of difluoromethane, the refrigerant provided by the invention has the advantages of higher safety (the combustibility is inhibited by R125) and reduced theoretical exhaust temperature, and has the advantages of obviously reduced GWP value and improved refrigeration efficiency; Compared with single use of trifluoroethylene, the refrigerant provided by the invention has the advantages of higher safety (the combustibility is inhibited by R125) and reduced theoretical exhaust temperature; Compared with pentafluoroethane used alone, the refrigerant provided by the invention has the advantages of remarkably reduced GWP value and greatly improved refrigeration efficiency. In general, the refrigerant has a low Global Warming Potential (GWP), high energy efficiency, and good system compatibility, and is suitable for direct replacement of R410A. Preferably, the low GWP refrigerant replacing R410A comprises 55-60 parts by weight difluoromethane, 30-35 parts by weight ‌ parts by weight 1, 2-pentafluoroethane ‌,1-5 parts by weight n-butane. Preferably, the low GWP refrigerant replacing R410A comprises 55-60 parts by weight difluoromethane, 36-40 parts by weight ‌,1, 2-pentafluoroethane ‌,6-10 parts by weight n-butane. Preferably, the low GWP refrigerant replacing R410A comprises 61-65 parts by weight difluoromethane, 30-35 parts by weight ‌ parts by weight 1, 2-pentafluoroethane ‌,1-5 parts by weight n-butane. Preferably, the low GWP refrigerant replacing R410A comprises 61-65 parts by weight difluoromethane, 36-40 parts by weight ‌,1, 2-pentafluoroethane ‌,6-10 parts by weight n-butane. More preferably, the low GWP refrigerant replacing R410A comprises 56 parts by weight difluoromethane, 32 parts by weight 1, 2-pentafluoroethane, 3 parts by weight n-buta