THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Xin Gu

,

Xin Liu

,

Hao Sun

,

Yiwen Zhu

,

Yongqing Wang

ANALYSIS OF FLOW AND HEAT TRANSFER PERFORMANCE OF DIFFERENT TYPES OF FLOW CHANNELS IN PRINTED CIRCUIT HEAT EXCHANGERS FOR PRE-COOLERS

ABSTRACT
The shape of fins in flow channels of printed circuit heat exchangers (PCHE) significantly affects the heat exchanger performance. In the pre-cooler condition of the marine supercritical CO2 Brayton cycle power generation system, this study focuses on three typical discontinuous flow channel printed circuit heat exchangers. The investigation involves a numerical analysis of flow and heat transfer performance using CFD method. The comparative consequences illuminate that the rectangular fin channel exhibits the optimal heat transfer performance, and temperature drops are 1.18 times and 1.23 times, exceeding those of airfoil and rhombic fin channels, respectively. All three flow channels show different degrees of temperature drop reduction along the direction of fluid-flow. However, the rectangular fin channel demonstrates the worst flow performance, as pressure drops are 16.6 times and 17.8 times, higher than those of airfoil and rhombic fin channels, respectively. By calculating the values of Nu/f and Q/Δp, the comprehensive performance of each flow channel is ranked from high to low airfoil fin channel, rhombic fin channel, and rectangular fin channel. This research provides guidance for optimizing the design and applying PCHE in engineering for marine supercritical CO2 Brayton cycle pre-coolers.
KEYWORDS
printed circuit heat exchanger, Channels, comprehensive performance
PAPER SUBMITTED: 2023-09-02
PAPER REVISED: 2024-01-04
PAPER ACCEPTED: 2024-01-23
PUBLISHED ONLINE: 2024-04-13
DOI REFERENCE: https://doi.org/10.2298/TSCI230902072G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 4, PAGES [2977 - 2988]
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Analysis of flow and heat transfer performance of different types of flow channels in printed circuit heat exchangers for pre-coolers

© 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