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http://dx.doi.org/10.7316/KHNES.2022.33.5.534

A Simulation Study on the Hydrogen Liquefaction through Compact GM Refrigerator  

JUNG, HANEUL (Department of Environment and Energy Engineering, The University of Suwon)
HAN, DANBEE (Department of Environment and Energy Engineering, The University of Suwon)
YANG, WONKYUN (Cryo H&I, Cryogenic R&D Center)
BAEK, YOUNGSOON (Department of Environment and Energy Engineering, The University of Suwon)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.33, no.5, 2022 , pp. 534-540 More about this Journal
Abstract
Liquid hydrogen has the best storage capacity per unit mass and is economical among storage methods for using hydrogen as fuel. As the demand for hydrogen increases, the need to develop a storage and supply system of liquid hydrogen is emphasizing. In order to liquefy hydrogen, it is necessary to pre-cool it to a maximum inversion temperature of -253℃. The Gifford-McMahon (GM) refrigerator is the most reliable and commercialized refrigerator among small-capacity cryogenic refrigerators, which can extract high-efficiency hydrogen through liquefied hydrogen production and boil of gas re-liquefaction. Therefore, in this study, the optimal conditions for liquefying gas hydrogen were sought using the GM cryocooler. The process was simulated by PRO/II under various cooling capacities of the GM refrigerator. In addition, the flow rate of hydrogen was calculated by comparing with specific refrigerator capacity depending on the pressure and flow rate of a refrigerant medium, helium. Simulations were performed to investigate the optimal values of the liquefaction flow rate and compression pressure, which aim for the peak refrigeration effect. Based on this, a liquefaction system can be selected in consideration of the cycle configuration and the performance of the refrigerator.
Keywords
Liquid hydrogen; Cryogenic refrigerator; Pre-cool; Maximum inversion temperature; Refrigerator capacity;
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