80 K Closed-Cycle Throttle Refrigerator

Longsworth, R. C.; Boiarski, M.; Klusmier, L. A.

doi:10.1007/978-1-4757-9888-3_55

Cited by 36 publications

(8 citation statements)

References 2 publications

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“…The opportunity of using lower operating pressures has provided considerable incentive for the development of long-life, closed-cycle J-T cryocoolers. For example, Longsworth et al (1995) recently described a closed-cycle system using a commercially available oil-lubricated compressor operating at about 2 MPa with a five-component nitrogen-hydrocarbon gas mixture to obtain 1 W of refrigeration at 80 K and 10 W at 93 K for an input power of 350 to 400 W. In this unit the inlet to the expansion valve is essentially all liquid, which entails extensive two-phase flow of the mixture in the recuperative heat exchanger. Considerable theoretical and experimental work is currently underway with various gas mixtures to obtain a better understanding of the optimum compositions and operating variables for specific cooling tasks and the effect of different multicomponent two-phase flow conditions that could be formed at the lower temperatures.…”

Section: Vol 42 No 11mentioning

confidence: 99%

Cryocooler development (1995 AIChE Institute Lecture)

Timmerhaus

1996

AIChE Journal

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Section: Vol 42 No 11mentioning

confidence: 99%

Cryocooler development (1995 AIChE Institute Lecture)

Timmerhaus

1996

AIChE Journal

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“…Based on the mixture composition they stated the performance of heat exchanger in terms of overall heat transfer coefficient along the length of heat exchanger. Few researchers have investigated experimental and numerical studies related to usage of mixed refrigerants in J-T refrigerators, but paid attention on optimizing the mixture composition [3][4][5][6][7][8]. Moreover very limited literature is available about the performance analysis of coiled tube-in-tube heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Parametric Analysis of Wire Finned Coiled Tube Heat Exchanger in a Small J-T Refrigerator

Kruthiventi¹,

Rasu²,

Rao³

2021

IJHT

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In the present study, numerical analysis of coiled tube heat exchanger used in J-T refrigerator is carried out. A computer code is developed to estimate the length of the heat exchanger by giving mass flow rate, diameter of tube and shell as input parameters. This code is verified against experimental data. Two different configurations are considered in this study viz., heat exchanger with wire fin wound around the inner tube of heat exchanger and without wirefin. Three different refrigerant mixtures are used to evaluate the performance of heat exchangers. The variations of temperature and heat transfer coefficient are brought out as result. Significant reduction in the length of heat exchanger is observed in all the cases. Mixture-1 causes 33% reduction in length of heat exchanger with wirefin. Similarly, for mixture-2 and mixture-3 the length is reduced by 15% and 30%. Additionally, heat transfer coefficient (HTC) values are also estimated for heat exchanger with wirefin and without wirefin. Considerable increase in HTC values is observed in the heat exchanger with wirefin.

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“…Alexeev et al [9] developed computational model using Hextran software program to investigate the behavior of refrigerant mixture in the heat exchanger of a Joule-Thomson refrigerating system to optimize the design of heat exchanger. Later several researchers extended their studies experimentally and numerically for optimization of mixtures and their composition [10][11][12][13][14]. Few authors [3,4] reported that a selection of mixture composition is done based on better performance and efficiency of the system.…”

Section: Introductionmentioning

confidence: 99%

An Identification of the Best Mixture Composition for the Joule-Thomson Refrigerator Operating at 90 K

Sarath¹,

Tjprc²

2018

IJMPERD

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In recent days researchers have been trying to operate Joule-Thomson refrigerators with mixed refrigerants instead of single refrigerant as operating fluid. Usage of mixtures in the place of single refrigerant is increasing rapidly because of some favourable conditions like achieving high heat transfer coefficients, avoiding of multistage compression units, high overall efficiency of the refrigerator and a mixture of refrigerants gives more pollution free environment. Conventional vapour compression refrigeration system working with chlorofluorocarbon refrigerants will deplete the ozone layer, whereas joule Thomson refrigerators with a mixture of refrigerants will not detrimental to ozone layer hence it is more suitable for a green environment. The present paper discusses the selection of the appropriate mixture for Joule-Thomson refrigerator operating at 90 K in Gas Refrigerant supply (GRS) mode and its effect on the performance of the overall system. It is estimated that the optimization of mixture composition enhances the exergy efficiency from 31.4% to 34 % with a substantial increasein refrigeration capacity.

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80 K Closed-Cycle Throttle Refrigerator

Cited by 36 publications

References 2 publications

Cryocooler development (1995 AIChE Institute Lecture)

Cryocooler development (1995 AIChE Institute Lecture)

Modelling and Parametric Analysis of Wire Finned Coiled Tube Heat Exchanger in a Small J-T Refrigerator

An Identification of the Best Mixture Composition for the Joule-Thomson Refrigerator Operating at 90 K

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