Cold storage refrigerant has experienced three stages of development

at present our country mainly ammonia and freon refrigerants for cold storage. With the amount of ammonia, freon: F - 11日,F - 12日,F - 13日,F - 22 wait for a few kinds.

1, the proterozoic is given priority to with natural mineral such as ammonia and carbon dioxide;

the synthesis of 2, chlorine refrigerant CFCS ( R11, R12? Etc. ) And HCFCS ( R22, etc. ) ；

3 substance, environmental protection, the green working medium ( Everything, r404a, R507a, R407c, r410a, etc. ) 。

before two kinds of refrigerants refrigerator for ozone depletion, three will produce the greenhouse effect. Four generations of cold storage on the development direction of refrigerant, there are two directions, one is to find more difficult to synthesis of new compounds, the other one is returned to the generation of refrigerants, the natural working substance. Look from nearly a decade the development of alternative, whether in theory or in practice, it is difficult to find a kind of ideal alternative does not affect the environment, and safe and inexpensive. Many put forward four generations, therefore, refrigerant return natural working substance is inevitable trend. Natural working substance consists of hydrocarbons, such as ammonia, carbon dioxide and propane including water, air, and also used for the low-temperature refrigeration, helium, methane, nitrogen, such as

currently USES ammonia refrigerant is the mainstream, the ammonia still will be the main refrigerants, using ammonia refrigerant is the key to security issues.

reproduced: baidu know

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