Optimization of Intake and Exhaust Valves for 4 K Gifford-McMahon Cryocooler

Li, Rui; Onishi, Atsushi; Satoh, Toshimi; Kanazawa, Yoshiaki

doi:10.1016/b978-008042688-4/50079-x

Cited by 2 publications

(2 citation statements)

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“…Heat balance and exergy analysis of a single‐stage GM cryorefrigerator has been carried out by Ackerman and Gifford and Thirumaleshwar and Subramanyam respectively. Also, different recommendations for improvement of cooling power have been proposed, such as coatings on regenerator matrix material by Xu et al The effect of magnetic field on the cooling characteristics of a single‐stage GM cooler has been studied by Bao et al The effect of inlet and exhaust valve openings on the cooling capacity has also been addressed . Significant experimental investigations on the cooling performance of a rotary valve is reported in previously mentioned studies …”

Section: Introductionmentioning

confidence: 99%

“…Also, different recommendations for improvement of cooling power have been proposed, such as coatings on regenerator matrix material by Xu et al [19][20][21] The effect of magnetic field on the cooling characteristics of a single-stage GM cooler has been studied by Bao et al 19,22,23 The effect of inlet and exhaust valve openings on the cooling capacity has also been addressed. 24,25 Significant experimental investigations on the cooling performance of a rotary valve is reported in previously mentioned studies. 6,9,23 This paper mainly addresses the effect of two different opening shapes of the rotary valve, such as Gaussian and triangular shapes, on cooling power and coefficient of performance (COP) of a single-stage GM cryorefrigerator.…”

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confidence: 99%

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Effect of valve opening shapes on the performance of a single‐stage Gifford‐McMahon cryocooler

Panda

Satapathy

Sarangi

2019

Engineering Reports

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In this work, the effect of the triangular and Gaussian‐shaped opening of the rotary valve (ie, the valve timing diagram of high‐pressure and low‐pressure valves) on the performance of a single‐stage Gifford‐McMahon (GM) cryorefrigerator is numerically investigated. In addition, the effect of waiting time of the rotary valve on its cooling power and coefficient of performance is studied for both types of opening shapes. The governing equations representing the fluid flow and heat transfer behaviors of the refrigerator are solved by using an implicit finite‐volume discretization method. The model considers both primary and secondary loss mechanisms. The developed model is first validated with the published results on GM cryorefrigerators. A very good agreement appears among them. It is observed that no significant change can be appreciated in the cooling power between 40° to 90° of waiting time for both types of opening shapes. On the other hand, in‐between 1° to 40° of waiting time, the cooling power of the Gaussian‐shaped opening of the rotary valve is higher than the one of the triangular opening.

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