Numerical investigation on the Thermal-hydraulic performance of the modified channel supercritical CO2 printed circuit heat exchanger

Title

Numerical investigation on the Thermal-hydraulic performance of the modified channel supercritical CO2 printed circuit heat exchanger

 Author

Wang, J. (TU Delft Energy Technology; Wuhan University of Technology; MOST)
Yan, Xin ping (Wuhan University of Technology; MOST)
Boersma, B.J. (TU Delft Marine and Transport Technology) ORCID 0000-0002-5240-8273
Lu, Ming jian (Wuhan University of Technology; MOST)
Liu, Xiaohua (Wuhan University of Technology; MOST)

Department

Marine and Transport Technology

 Date

2023

 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%.


 Subject

CFD
Heat transfer
Modified channel
Printed circuit heat exchanger
Supercritical carbon dioxide

 To reference this document use:

http://resolver.tudelft.nl/uuid:194d20f8-2f2b-4715-ad5b-47b38cdc8be0

 DOI

https://doi.org/10.1016/j.applthermaleng.2022.119678

 Embargo date

2023-07-01

 ISSN

1359-4311

 Source

Applied Thermal Engineering, 221

 Bibliographical note

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

 Part of collection

Institutional Repository

 Document type

journal article

 Rights

© 2023 J. Wang, Xin ping Yan, B.J. Boersma, Ming jian Lu, Xiaohua Liu
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