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...

AI Technical Summary

Problems solved by technology

When the refrigeration temperature is further lowered, if the temperature range of 200K and below is to be realized, the method usually adopted is a two-stage external cascade refrigeration cycle, and the cascade method is used to achieve a lower temperature, which makes the refrigeration system complex, with low efficiency and high reliability. Low

It can be seen from this that the existing methods for realizing the 200-240K temperature range have problems such as complex system, high cost, low reliability and low efficiency.

At present, there is no patent report for the above temperature zone

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