THERMAL SCIENCE

International Scientific Journal

INVESTIGATION ON THE FLOW AND HEAT TRANSFER CHARACTERISTICS OF SUPERCRITICAL CO2 IN PRINTED CIRCUIT HEAT EXCHANGER WITH ASYMMETRIC AIRFOIL FINS

ABSTRACT
As an essential component of the supercritical CO2 recompression Brayton cycle, the recuperator has a significant impact on the efficiency and stability of the entire cycle system. The printed circuit heat exchanger is the most suitable heat exchanger for the recuperator in the supercritical CO2 recompression Brayton cycle. To investigate the effects of the structural parameters of the asymmetric AFF on the thermo-hydraulic performance of the printed circuit heat exchangers, simplified 3-D numerical simulation models for the printed circuit heat exchanger with National Advisory Committee for Aeronautics 85XX series asymmetric AFF were built. An optimization method combining an orthogonal experiment and a quadratic polynomial surrogate model with a multi-objective genetic algorithm was proposed to obtain the optimal structural parameters. The results show that the fin thickness, lb, has the most significant effect on the comprehensive performance and fluid-flow performance, and the transverse spacing, lc, has the highest influence on the thermal performance. The optimum structural parameters set are a combination of the transverse spacing of 3.9 mm, the longitudinal spacing of 11.5 mm, and the fin thickness of 0.77mm.
KEYWORDS
PAPER SUBMITTED: 2022-12-24
PAPER REVISED: 2023-02-09
PAPER ACCEPTED: 2023-02-13
PUBLISHED ONLINE: 2023-04-22
DOI REFERENCE: https://doi.org/10.2298/TSCI221224075W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 6, PAGES [4565 - 4579]
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© 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