THERMAL SCIENCE

International Scientific Journal

Qingfeng Jiang

,

Ming Zhuang

,

Zhigang Zhu

,

Linhai Sheng

,

Ping Zhu

INFLUENCE OF HEAT IN-LEAK, LONGITUDINAL CONDUCTION AND PROPERTY VARIATIONS ON THE PERFORMANCE OF CRYOGENIC PLATE-FIN HEAT EXCHANGERS BASED ON DISTRIBUTED PARAMETER MODEL

ABSTRACT
For helium liquefaction/refrigeration systems, conventional design theory always fails in cryogenic applications and heat exchangers operating at low temperatures are usually sensitive to longitudinal heat conduction, heat in-leak from surroundings and variable fluid properties. Governing equations based on distributed parameter methods are developed to evaluate performance deterioration caused by these effects. The model synthetically considering these loss mechanisms is validated against experimental data and design results obtained by commercial software Aspen MUSETM. Sample multistream heat exchangers are further studied to discuss quantitative effects of these heat losses. In accordance with previous researches, the comprehensive effects of various losses are analyzed qualitatively in order to reveal their influences and investigate on the strategies of improving the heat transfer performance. The numerical method is useful in the design procedure of cryogenic heat exchangers and can be adopted to predict heat transfer and pressure drop performance under the actual low temperature environment.
KEYWORDS
heat exchanger, longitudinal conduction, heat in-leak, helium liquefier, helium refrigerator
PAPER SUBMITTED: 2017-06-27
PAPER REVISED: 2017-11-12
PAPER ACCEPTED: 2017-11-14
PUBLISHED ONLINE: 2017-12-03
DOI REFERENCE: https://doi.org/10.2298/TSCI170627235J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 3, PAGES [1969 - 1979]
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Influence of heat in-leak, longitudinal conduction and property variations on the performance of cryogenic plate-fin heat exchangers based on distributed parameter model

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence