Substitute refrigerant for freon-12 centrifugal cold water machine set

Abstract

A substitute refrigerant for freon-12 centrifugal cold water machine set is prepared from monochlorodifluoromethane, 1,1,1,2,3,3,3-heptafluoropropane, 1-monochloro-1,1-difluoroethane, and optional isobutane through proportionally physical mixing. Its advantages include environmental protection, high safety and refrigerating efficiency, and no need of reforming existing equipment.

Description

technical field [0001] The invention belongs to a refrigerant, in particular to a refrigerant used in a centrifugal chiller. Background technique [0002] Freon-12 (CFC-12) has been widely used in refrigeration systems and other fields for a long time due to its low toxicity, non-flammability, non-corrosion and compatibility with other materials. However, since the discovery in 1974 that CFCs have a serious detrimental effect on the atmospheric ozone layer, it has attracted more and more international attention, and it has been decided to gradually restrict the production and use of CFCs. my country will stop using CFC-12 on January 1, 2010. At present, as the refrigerant of centrifugal chillers, the use of CFC-12 still accounts for a considerable proportion. [0003] The parameters of the CFC-12 centrifugal compressor, such as the impeller speed and the basic size of the impeller, are determined according to a certain evaporating temperature, condensing temperature, and t...

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Problems solved by technology

Therefore, the scope of claims of this patent is not applicable to centrifugal chillers