Green mixed refrigerant

Abstract

The invention discloses a green mixed refrigerant, comprising 20-60 wt% of 2,3,3,3-tetrafluoro propylene or trans-1,3,3,3-tetrafluoro propylene, 5-30 wt% of 1,1-difluoroethane or 1,1,1,2-tetrafluoro ethane, and 35-60 wt% of difluoromethane. The preparation method is characterized by physically mixing the above ingredients according to corresponding ratio at normal temperature. According to the invention, because the volume refrigerating capacity of the green mixed refrigerant is very close to that of HCFC-22 and the condensation pressure of the green mixed refrigerant is lower than that of R410A, the green mixed refrigerant can be directly filled in existing refrigeration, air-conditioning or heat pump sets which use HCFC-22; and when HCFC-22 is replaced, the components and pipeline of the system have no need of redesigning. The green mixed refrigerant can be an alternative refrigerant to HCFC-22 and R410A.

Description

technical field [0001] The invention relates to a green mixed refrigerant used in refrigeration and air-conditioning systems, in particular to a mixed refrigerant containing difluoromethane which can replace HCFC-22 and R410A. Background technique [0002] Freons represented by HCFC-22, CFC-12, and CFC-11 have excellent thermodynamic cycle performance and are widely used in refrigeration, air conditioning and other industries. However, such substances have high ozone depletion potential (ODP), stay in the atmosphere for a long time, and have high global warming potential (GWP). They are one of the main chemical substances that destroy the atmospheric ozone layer and produce the greenhouse effect. After the ozone layer is destroyed, harmful ultraviolet radiation will directly reach the surface of the earth, causing serious damage to crops and phytoplankton in the ocean, and will also affect the human immune system, increasing the incidence of skin cancer and cataracts. Globa...

AI Technical Summary

Problems solved by technology

However, these refrigerants have their own advantages and disadvantages, and they are still not very ideal.

Among them, the heat transfer performance of R407C is poor, and the volume cooling capacity and COP value under the same working conditions are smaller than HCFC-22. In order to achieve the same cooling capacity as HCFC-22, it is necessary to strengthen the heat transfer effect of the heat exchanger, and the manufacturing cost will increase

The volumetric cooling capacity of R410A is much larger than that of HCFC-22, but its evaporation pressure and condensation pressure are also much higher than that of HCFC-22. roads and systems, and both of these two mixed refrigerants have high GWP values, a large amount of emissions will aggravate global warming

HFC-134a has excellent thermodynamic properties and good safety in use, and has become a widely used refrigerant in the refrigeration and air-conditioning industry at home and abroad. Its ODP is zero, but its GWP is still high, and a large amount of use will also cause global warming.