Li, W., Yu, G. and Yu, Z. (2020) Bioinspired heat exchangers based on triply periodic minimal surfaces for supercritical CO2 cycles. Applied Thermal Engineering, 179, 115686. (doi: 10.1016/j.applthermaleng.2020.115686)
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Abstract
The supercritical carbon dioxide (sCO2) based Brayton cycle is a proposed alternative to replace conventional Rankine cycles in terms of high cycle efficiency, compact turbomachinery and heat exchangers. In the sCO2 cycle, however, the existing heat exchangers have been challenged by large portion of heat transfer (approximately 60–70% of total cycle heat transfer) and high cycle efficiency required. In the present study, two novel heat exchangers were proposed by utilizing triply periodic minimal surface (TPMS) structures. i.e. the Gyroid structure and Schwarz-D surface, to enhance heat transfer and improve cycle efficiency. TPMS structures are a class of structures composed of two distinct inter-penetrating volume domains separated by an area-minimizing wall, which have been observed as biological membranes and co-polymer phases. Two heat exchangers along with a reference printed circuit heat exchanger (PCHE) were investigated numerically by computational fluid dynamics simulations when the hot and cold sCO2 fluids pass through them at various Reynolds numbers. Effects of geometrical shapes and Reynolds number on the hydraulic and thermal performances were identified. It was demonstrated that two heat exchangers with TPMS can improve overall thermal performance by 15–100%, and the Nusselt number is raised by 16–120% for a given pumping power in comparison with the PCHE. Hence, heat exchangers with TPMS have a very good potential to enhance sCO2 cycle efficiency.
| Item Type: | Articles |
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| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Yu, Dr Guopeng and Li, Mr Weihong and Yu, Professor Zhibin |
| Authors: | Li, W., Yu, G., and Yu, Z. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Applied Thermal Engineering |
| Publisher: | Elsevier |
| ISSN: | 1359-4311 |
| ISSN (Online): | 1873-5606 |
| Published Online: | 06 July 2020 |
| Copyright Holders: | Copyright © 2020 The Authors |
| First Published: | First published in Applied Thermal Engineering 179:115686 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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