Parametric CFD study for finding the optimal tube arrangement of a fin-and-tube heat exchanger with plain fins in a marine environment

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2022-01-05
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
Series
Applied Thermal Engineering, Volume 200
Abstract
In the past, fin-and tube heat exchanger (FTHE) tube pattern ratios have been largely based on ad-hoc design principles. Here, we investigate the optimal tube arrangements for a FTHE with plain fins in marine environments represented by two different air types; one for unfiltered air with high condensation rate and one for clean dry filtered air conditions. The thermal-hydraulic efficiency of the FTHE design is measured by comparing a modified ratio of Colburn j-factor and Fanning friction factor. The regression model generated from the CFD data is then used to identify the maximum efficiency for two design specific fin pitches separately. We identified two optimal tube patterns: one for a large fin pitch for unfiltered air, and another for a small fin pitch for filtered air. Manufacturing restrictions were found to significantly limit the maximum achievable efficiency of a tube pattern. By neglecting the related manufacturing restrictions, 4% higher efficiency for a fin pitch of 1.5 mm and 23% higher efficiency for a fin pitch of 3.5 mm is achieved. Without any application specific limitations or manufacturing restrictions the fin pitch 1.5 mm can have a 36% increased efficiency than fin pitch 3.5 mm. These novel results show that development in manufacturing have potential for significant improvements in thermal-hydraulic efficiency.
Description
Funding Information: The authors wish to acknowledge CSC – IT Center for Science, Finland, for computational resources and Koja Oy, for financial support. Publisher Copyright: © 2021 The Authors
Keywords
Conjugate heat transfer, Fin-and-tube, Heat exchanger, Plain fin
Other note
Citation
Välikangas , T , Folkersma , M , Dal Maso , M , Keskitalo , T , Peltonen , P & Vuorinen , V 2022 , ' Parametric CFD study for finding the optimal tube arrangement of a fin-and-tube heat exchanger with plain fins in a marine environment ' , Applied Thermal Engineering , vol. 200 , 117642 . https://doi.org/10.1016/j.applthermaleng.2021.117642