Multicomponent mixed work medium throttling refrigerant applicable to medium-low temperature zone
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A multi-component mixed working medium and refrigerant technology, applied in the field of cryogenic refrigeration, can solve the problems of the mixed working medium cannot operate efficiently, the operating temperature range is narrow, and the efficiency is reduced.
Inactive Publication Date: 2005-02-16
中科赛凌(北京)科技有限公司
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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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[0071] The present invention will be described in further detail below in conjunction with the drawings and examples.
[0072] combine figure 1 and image 3 Specifically clarify the thermodynamic working process of the mixed working medium throttling refrigerant proposed by the present invention:
[0073] The mixed working medium throttling refrigerant of the present invention enters the compressor CP from the state L1 and is compressed to the state G01; then enters the cooler AC to cool to the state G0; enters the regenerative heat exchanger HX and is further cooled to G1; then passes through The throttling element JT becomes L3 after throttling; enters the evaporator EV, extracts cooling capacity and becomes L2; b then enters the recuperation heat exchanger HX for reheating, returns to the state L1, and completes a thermodynamic cycle.
[0074] for figure 2 The thermodynamic cycle shown has the same basic working process, except that one stage of vapor-liquid separatio...
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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 invention relates to cryogenic refrigeration technology, in particular to a throttling refrigerant of multiple mixed working fluids suitable for medium and low temperature regions (150-200K). Background technique [0002] The traditional way to realize the 150-200K temperature zone is to use two-stage or three-stage external cascade refrigeration cycle, and the cascade method to achieve lower temperature makes the refrigeration system complex, with low efficiency and low reliability. However, the use of multiple mixed working fluids in the 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 , is mainly composed of compressor CP, cooler AC, counterflow recuperator HX, throttling element JT and low temperature evaporator EV. Sometimes, in order ...
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