CN-119505815-B - Mixed refrigerant and application thereof

Abstract

The invention belongs to the technical field of refrigerants and discloses a mixed refrigerant and application thereof, wherein the mixed refrigerant consists of two or three of ethane, propane, propylene and difluoroethane, when the components contain ethane, the mass percentage of the ethane in the mixed refrigerant is not more than 10% or is 21% -50%, and when the components contain difluoroethane, the mass percentage of the difluoroethane in the mixed refrigerant is 65% -85%. The invention can solve the technical problems of high GWP value, low energy efficiency, low refrigerating capacity per unit volume and influence on refrigerating performance of the traditional refrigerant by improving the component components and the proportion of each component of the mixed refrigerant, can be used for replacing R32 or R290, has low exhaust temperature, large refrigerating capacity per unit volume and small refrigerant filling quantity, and can be used for replacing high GWP refrigerants such as R32, R410A and the like.

Inventors

• CAI DEHUA
• Hao Zian

Assignees

• 华中科技大学

Dates

Publication Date

20260505

Application Date

20241112

Claims (4)

1. 1. A mixed refrigerant is characterized by comprising three components of propane, propylene and difluoroethane; The mass percentage of difluoroethane in the mixed refrigerant is 65-85%.
2. 2. The mixed refrigerant according to claim 1, wherein the mass ratio of the three of propane, propylene and difluoroethane in the mixed refrigerant is 0.05:0.1:0.85, or 0.05:0.3:0.65, or 0.1:0.05:0.85, or 0.3:0.05:0.65.
3. 3. Use of a mixed refrigerant as claimed in any one of claims 1-2 as a refrigerant medium.
4. 4. The method according to claim 3, wherein the mixed refrigerant is used as a refrigerant for domestic air conditioning, central air conditioning, heat pump water heater, cold storage or automotive air conditioning, and is used for replacing R32, R410A refrigerant.

Description

Mixed refrigerant and application thereof Technical Field The invention belongs to the technical field of refrigerants, and particularly relates to a mixed refrigerant and application thereof, wherein the mixed refrigerant belongs to an environment-friendly mixed refrigerant capable of replacing R32 or R410A. Background With the emphasis of ozone layer destruction and greenhouse effect exacerbation, chlorine-containing refrigerants with ODP greater than zero are phased out in various countries in the world, and the use of Hydrofluorocarbon (HFC) refrigerants with high Global Warming Potential (GWP) is limited, 10 months in 2016, the basic calide amendment of Montreal protocol defines the management of 18 HFCs, and the task of searching for substitute refrigerants with excellent performance is not slow. In recent years, difluoromethane (R32) has been widely used as a transition substitute for R410A in the field of home air conditioning, with higher refrigeration per unit volume and coefficient of performance (COP) for system applications, as well as lower GWP. However, according to the inter-government climate change specialization committee sixth evaluation report (IPCC AR 6), the GWP of R32 was modified to 771 so as to be higher than the limit of the european meeting fluorine-containing gas regulations (F-gas) for refrigerants used in home air-conditioning. Fluorinated greenhouse gases having GWP of 750 or higher will be prohibited from being used in split air conditioning systems with charges of less than 3 kg after 2025 according to the regulations of the european meeting, and thus research into alternatives to R32 used in air conditioning is also urgent. The current refrigerant replacement for R32, the natural refrigerant propane (R290), is one of the main ideas therein. However, the air conditioning system using R290 as a refrigerant has a low refrigerating capacity per unit volume, energy efficiency is required to be further improved, and the charge amount is severely limited. Therefore, a new refrigerant is needed to solve the above problems. He Guogeng teaches a binary mixed refrigerant constructed by using ethane and propylene (see chinese patent application CN114752357 a), wherein the mass percentage of ethane is 11% -20% and the mass percentage of propylene is 89% -80%, which can act as a substitute for R32, R410a refrigerants. Although this refrigerant can replace R32 to some extent, this new refrigerant still has room for improvement in terms of system energy efficiency, refrigeration per unit volume, and safety (the composition of this refrigerant is a strong flammable refrigerant as R290, and does not improve the safety of pure R290). In addition, he Guogeng teaches a ternary mixed refrigerant constructed by using ethane, propylene and propane (see chinese patent application CN114752356 a), wherein 12% -20.5% ethane, 75.5% -87% propylene and 1% -4% propane can also function as a substitute for R32, R410a refrigerants. Although this refrigerant can replace R32 to some extent, this new refrigerant also has room for improvement in terms of system energy efficiency, refrigeration capacity per unit volume, and safety (the composition of this refrigerant is a strong flammable refrigerant as R290, and does not improve the safety of pure R290). Disclosure of Invention In view of the above-mentioned drawbacks or improvements of the prior art, an object of the present invention is to provide a mixed refrigerant and application thereof, in which the technical problems of high GWP value, low energy efficiency, low refrigerating capacity per unit volume and influence on refrigerating performance of the existing refrigerant can be solved by improving the component ingredients and the duty ratio of each component of the mixed refrigerant. The refrigerant obtained by the invention is a mixed refrigerant, belongs to energy-saving and environment-friendly refrigerants, has high energy efficiency, can be used for replacing R32 or R290 (even directly replacing R32 or R290 without replacing a refrigerating component), has low exhaust temperature, large refrigerating capacity in unit volume and small refrigerant filling amount. The ODP value of the invention is 0, the GWP value is lower than 150, the environmental protection advantage is outstanding, the invention has wide application prospect, and the invention can be used for replacing high GWP refrigerants such as R32, R410A and the like. The method is applicable to refrigeration equipment such as household and commercial air conditioning systems, heat pump water heaters, refrigeration houses, automobile air conditioners and the like. In order to achieve the above object, according to one aspect of the present invention, there is provided a mixed refrigerant composed of two or three of ethane, propane, propylene and difluoroethane; When the components contain ethane, the mass percentage of the ethane in the mixed refrigerant is not more than 10 percent, or 21-5