期刊
APPLIED THERMAL ENGINEERING
卷 179, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.115686
关键词
Supercritical carbon dioxide; Triply periodic minimal surface; Heat exchanger; Nusselt number; Conjugate heat transfer
资金
- EPSRC in the UK [EP/N020472/1, EP/N005228/1, EP/P028829/1, EP/R003122/1]
- EPSRC [EP/N005228/1, EP/N020472/1, EP/P028829/1, EP/R003122/1] Funding Source: UKRI
The supercritical carbon dioxide (sCO(2)) 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 sCO(2) 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 sCO(2) 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 sCO(2) cycle efficiency.
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