Effect of Channel Shape on Heat Transfer and Mechanical Properties of Supercritical CO 2 Microchannel Heat Exchanger

Peiyue Li, Wen Fu, Kaidi Zhang, Qiulong Li, Yi Zhang, Yanmo Li, Zhihua Wang, Xiuhua Hou, Yuwei Sun and Wei Wei ()
Additional contact information
Peiyue Li: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Wen Fu: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Kaidi Zhang: State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan 430063, China
Qiulong Li: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Yi Zhang: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Yanmo Li: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Zhihua Wang: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Xiuhua Hou: Luoyang Ship Material Research Institute (LSMRI), Luoyang 471000, China
Yuwei Sun: State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan 430063, China
Wei Wei: State Key Laboratory of Maritime Technology and Safety, Wuhan University of Technology, Wuhan 430063, China

Energies, 2024, vol. 17, issue 15, 1-17

Abstract: The heat exchanger plays a key role in the S-CO 2 power cycle of power generation systems based on waste heat and has a large impact on their cost control and compactness. In this paper, we take the channel shape of a microchannel heat exchanger as the research object and combine orthogonal tests and numerical simulation, taking the microchannel cross-section length/short-axis ratio, volume ratio and filling rate as independent variables, to numerically study multi-channel thermal–fluid–solid coupling and explore the effects of different microchannel cross-section length/short-axis ratios, volume ratios and filling rates on the thermal hydraulic and mechanical properties of the heat exchanger. The results show that a change in the channel volume ratio has a greater impact on the thermal hydraulic performance of the heat exchanger and that its heat transfer performance is only marginally affected by a change in the channel filling rate. Additionally, when other geometric parameters are kept to a certain level, the closer the shape of the channel is to a circle, the better its mechanical properties are. Within the range of permissible designs, a change in the channel volume ratio does not have an obvious impact on the mechanical properties of the microchannels, while the channel filling rate has the most significant impact. The most significant effect of the channel filling rate on the mechanical properties occurs through the channel volume ratio.

Keywords: microchannel heat exchanger; channel shape; heat transfer performance; mechanical properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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