Development of Compact 2K GM Cryocoolers

Xu, Mingzhi; Bao, Qian; Tsuchiya, Akihiro; Li, Rui

doi:10.1016/j.phpro.2015.06.064

Cited by 10 publications

(4 citation statements)

References 6 publications

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“…Finally, it is observed that the amount of gas that remains in the hot chamber A (after the exhaust valve is closed), which recirculates in the next cycle and which mixes with the gas coming from the compressor, is always negligible. In fact, it represents about 0.8% of the total gas that completes the cycle (see Table 1) Through this analysis Theoretically and experimentally, we have found some conclusions that are congruent with other experimental works [15][16][17][18]: indeed, the regenerator is the most critical part of the machine.…”

Section: Exergy Cycle Analysissupporting

confidence: 86%

Gifford McMahon Refrigerating Cycle for Liquefying Small Amounts of Hydrogen: Analysis of the Performances

Bartoli

2024

Preprint

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: This study presents energy and exergy analyses conducted on a Gifford-McMahon cycle refriger-ator. Through detailed numerical simulations, the performance of the refrigerator is thoroughly assessed, with a particular focus on energy and exergy losses. The obtained results are compared with Sankey and Grassman diagrams, providing visual representations of energy and exergy flows within the system. The localization of exergy losses is carefully analysed to identify key areas for optimization aimed at enhancing efficiency and power output. By pinpointing sources of ex-ergy destruction, targeted improvements can be implemented to maximize the overall perfor-mance of the refrigerator. Overall, this research contributes to a deeper understanding of the thermodynamic behaviour of Gifford-McMahon cycle refrigerators and provides valuable insights for optimizing their performance in practical applications.

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Section: Exergy Cycle Analysissupporting

confidence: 86%

Gifford McMahon Refrigerating Cycle for Liquefying Small Amounts of Hydrogen: Analysis of the Performances

Bartoli

2024

Preprint

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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%

“…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. A set of coupled nonlinear differential equations, which govern the fluid flow and heat transfer mechanisms inside the GM cryorefrigerator, have been discretized by using the finite-volume method.…”

mentioning

confidence: 99%

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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“…Dong Xu et al [12] showed that 4.2 K could be used to re-liquefy evaporated helium gas of small sized and medium sized cryogenic devices. A sequence parallel path helium liquefier with a liquefaction rate of 83 liters per day (l/day) using five 4 K GM cryocoolers is developed, and has been applied to Wuhan National High Magnetic Field Center (WHMFC) in China.…”

Section: Introductionmentioning

confidence: 99%

An Investigative Review and Experimental Approach for the Performance Assessment of Small Scale Gifford-McMahon Cryocooler

Krishna¹,

Tjprc²

2019

IJMPERD

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Helium recondensation or liquefaction system is the best platform to liquefy or to condense the helium in many applications viz., Nuclear Magnetic Resonance (NMR), Magnetic Resonance Imaging (MRI) and Superconducting Quantum Interference Devices (SQUIDS). These applications make use of liquid helium as a refrigerator. The large scale liquefaction systems serve as a central facility to provide liquid helium. The above mentioned applications require refilling on a regular basis which is troublesome in case of large scale liquefaction system; one can make use of small scale liquefaction setup based on a cryocooler. An effort has been made to develop a small scale liquefaction system by using two-stage Gifford McMahon cryocooler. This investigative review paper illustrates the liquefaction of helium by using a commercial cryocooler with 1.5 W cooling power at 4.2 K, provided with facility to precooling of incoming gas by using special type of heat exchangers.Impact Factor (JCC): 7.6197 SCOPUS Indexed Journal NAAS Rating: 3.11 either isentropic or isenthalpic. Usually Joule-Thomson expansion results in an isenthalpic expansion and a reciprocating engine or turbine expansion results in an isentropic expansion. Normally the helium gas liquefaction is carried out by the conventional Linde and Claude's processes. In Linde method, air is cooled, compressed and expanded in an alternate manner and the expansion process results in a lowering of temperature each time [3,4].

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Development of Compact 2K GM Cryocoolers

Cited by 10 publications

References 6 publications

Gifford McMahon Refrigerating Cycle for Liquefying Small Amounts of Hydrogen: Analysis of the Performances

Gifford McMahon Refrigerating Cycle for Liquefying Small Amounts of Hydrogen: Analysis of the Performances

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

An Investigative Review and Experimental Approach for the Performance Assessment of Small Scale Gifford-McMahon Cryocooler

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