Multicomponent mixed work medium throttling refrigerant applicable to medium-low temperature zone

Abstract

The multicomponent mixed work medium throttling refrigerating agent applicable to medium-low temp. zone includes five groups of substances, the sum of their mole concentration is 100%, in which first group includes methane, krypton or mixture, total mole concentration is 5%-45%, second group includes tetrafluoromethane, nitrogen trifluoride or mixture, total mole concentration is 15%-55%; fourth group includes propylene, propane, perfluoropane, 1,1,1-trifluoroethane, 1,1-bifluoroethane, fluoroethane, propadiene, cyclopropane, or mixture, total mole concentration is 5%-25%; fifth group includes 1-butylene, isobutane, 2-methylbutane, 1-pentene, 3-methyl-1-butylene, 2-methylpentane, 2-butylene, isobutylene, n-butane, perfluorobutane, n-pentane or mixture, total mole concentration is 5%-25%.

Description

Technical field [0001] The present invention relates to cryogenic refrigeration technology, in particular to a multi-element mixed working medium throttling refrigerant suitable for medium and low temperature regions (150-200K). Background technique [0002] The traditional method to achieve a temperature range of 150-200K is to use a two-stage or three-stage external cascade refrigeration cycle, and the use of a cascade method to achieve a lower temperature makes the refrigeration system complex, low in efficiency and low in reliability. The use of multiple mixed working fluids in a regenerative throttling refrigeration cycle driven by a single compressor with a simple structure can efficiently achieve a temperature range of 150-200K. The system diagram of the mixed working fluid regenerative throttling refrigerator is shown in figure 1 It is mainly composed of compressor CP, cooler AC, counter-flow heat exchanger HX, throttling element JT and low-temperature evaporator EV. Som...

AI Technical Summary

Problems solved by technology

The latest research shows that the effective operating temperature range of a fixed-component multi-component mixed working fluid is relatively narrow, generally around 5-15K, and the efficiency will drop sharply if it exceeds this range

Therefore, the mixture working fluid in the liquid nitrogen temperature zone cannot efficiently operate in the temperature zone above 150K

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