Numerical investigation on the Thermal-hydraulic performance of the modified channel supercritical CO<sub>2</sub> printed circuit heat exchanger

Journal article (2023)

Authors

J. Wang Energy Technology - Mechanical, Maritime and Materials Engineering , MOST, Wuhan University of Technology
Xin ping Yan MOST, Wuhan University of Technology
B.J. Boersma Marine and Transport Technology
Ming jian Lu Wuhan University of Technology, MOST
Xiaohua Liu Wuhan University of Technology, MOST
Department
Marine and Transport Technology
Copyright: © 2023 J. Wang, Xin ping Yan, B.J. Boersma, Ming jian Lu, Xiaohua Liu
DOI: https://doi.org/10.1016/j.applthermaleng.2022.119678
CFD Heat transfer Supercritical carbon dioxide Modified channel Printed circuit heat exchanger
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Published Date

2023

Language

English

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Department

Marine and Transport Technology

Abstract

Printed circuit heat exchangers (PCHE) are designed to improve heat recovery and energy saving in supercritical CO2 (S-CO2) power cycles. In the current study, a modified channel PCHE is proposed based on the regular straight channel and a zigzag channel. The thermal–hydraulic performance of four different types of PCHE is numerically investigated and the methods are verified by both experimental and numerical results. The numerical results are presented for a Reynolds number based on the inlet conditions between 5 000 and 25 000. From the numerical results, the local pressure loss and local heat transfer coefficients are analyzed and discussed. Subsequently, the global Nusselt number and Fanning friction coefficients are discussed. It is found that the inserted straight section contributes to uniform flow, resulted in significant pressure loss reduction with a slight decrease in heat transfer. The modified channel can reduce the Fanning friction coefficient by 33.1%-84.7% while the global Nusselt number reduction is about 3.6%-30.3%. This leads to a maximum performance evaluation criterion (PEC) enhancement of 45.9%.