Multicomponent mixed work medium throttling refrigerant applicable to 200-204K refrigerating temperature zone

Abstract

The multicomponent mixed work medium throttling refrigerating agent applicable to 200-240 k temp. zone includes four groups of substances, respectively are: first group includes tetrafluoromethane, nitrogen trifluoride or mixture; second group includes ethylene, ethane, fluoroform, xenon, fluromethane, perfluoroethylene, fluoroethylene, perfluoroethane or their any two, three and several kinds or mixture of all them; fourth group includes 1-butylene, isobutane, 2-methyl butane, 1-pentene, 3-methyl-1-butylene, 2-methylpentane, 2-butylene, cyclobutane, isobutylene, n-butane, pefluorobutane, n-pentane, perfluoropentane or their two, three, several kinds ormixture of all the them; and third group includees propylene, propane, perfluoropropane, 1,1,1-trifluoroethane, 1,1,-bifluoroethane.

Description

field of invention

[0001] The invention relates to refrigeration technology, in particular to a throttling refrigerant with multiple mixed working fluids suitable for the refrigeration temperature range of 200-240K. Background technique

[0002] The minimum refrigeration temperature of a single-stage vapor compression refrigeration cycle can generally only reach 230K, but when it actually reaches 240K, the refrigeration efficiency will deteriorate due to low evaporation pressure. In order to achieve a lower refrigeration temperature, a multi-stage compression method can be used. The multi-stage compression reduces the pressure ratio of each stage, thereby reducing the evaporation pressure. The two-stage compression cycle can generally achieve a refrigeration temperature of about 210K, while the multi-stage compression method A dedicated compressor is required. When the refrigeration temperature is further lowered, if the temperature range of 200K and below is to be realized...

Images