Heat exchangers for cooling supercritical carbon dioxide and heat transfer enhancement: a review and assessment

Li, W. and Yu, Z. (2021) Heat exchangers for cooling supercritical carbon dioxide and heat transfer enhancement: a review and assessment. Energy Reports, 7, pp. 4085-4105. (doi: 10.1016/j.egyr.2021.06.089)

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Supercritical and trans-critical carbon dioxide cycles are widely used for refrigerators, heat pumps and power plants, of which the heat exchangers are key components. This article presents a critical review of heat exchangers for cooled supercritical carbon dioxide (SCO2) flows, within which CO2 is close to its critical point and thus is likely to experience heat transfer deterioration or enhancement due to the dramatical change of thermo-physical properties. First, SCO2 heat transfer features were highlighted. Second, SCO2 heat transfer characteristics in heat exchangers were analysed in detail, including experiment, CFD simulation, dynamic response, and design of SCO2 heat exchanger. Third, SCO2 heat transfer enhancement was summarized. An approach for representing SCO2 thermo-physical and transport property constants versus temperature was proposed, and the heat transfer enhancement methods which may be potentially applicable to SCO2 heat exchanger design were assessed and selected according to performance evaluation criterion and enhancement efficiency as well as MATLAB optimization. It was demonstrated that a polynomial of Gaussian probability density function can reflect the variation of thermo-physical property constants of SCO2 with temperature mathematically and may be used in SCO2 heat exchanger design and thermal dynamic response analysis. When a SCO2 cooling heat exchanger works at Reynolds numbers .9104-2.55105, the protrusion, rough element and twisted tape insert approaches as well as nano-coating methods may be more suitable heat transfer enhancement methods for SCO2, but numerical and experimental confirmation is desirable. A preliminary guidance to design, optimization and experiment of SCO2 cooling heat exchanger for the project is offered.

Item Type:Articles
Additional Information:The work was supported by EPSRC, UK (EP/T022701/1). Dr Hongyang Li is acknowledged for reviewing the paper.
Glasgow Author(s) Enlighten ID:Li, Dr Wenguang and Yu, Professor Zhibin
Authors: Li, W., and Yu, Z.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Energy Reports
ISSN (Online):2352-4847
Published Online:08 July 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Energy Reports 7: 4085-4105
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
308940Generation of REfrigerated ENergy Integrated with Cold Energy storageZhibin YuEngineering and Physical Sciences Research Council (EPSRC)875461ENG - Systems Power & Energy