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Air-side heat transfer and pressure drop characteristics of flat-type, U-and V-shaped microchannel condensers for refrigerator applications

Authors
Oh, Sung HyukLee, Sang HunLee, DongChanMoon, Sung HyunKim, Yongchan
Issue Date
9월-2021
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Colburn j-factor; Condenser; Friction factor; Microchannel; Refrigerator
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, v.176
Indexed
SCIE
SCOPUS
Journal Title
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume
176
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/136794
DOI
10.1016/j.ijheatmasstransfer.2021.121460
ISSN
0017-9310
Abstract
In this study, the air-side heat transfer characteristics of microchannel heat exchangers (MCHXs), with enhanced shapes as condensers in refrigerators, are investigated. The heat transfer performances of flat-type, U- and V-shaped MCHXs, and conventional spiral fin-tube heat exchangers were measured and compared at various air flow rates and inlet temperatures. Furthermore, the Colburn j-factor and friction factor of the MCHXs were analyzed as a function of the Reynolds number. The second-type volume and area goodness factors were also analyzed to compare the heat transfer performances of the MCHXs considering various design parameters. Additionally, the empirical correlations of the Colburn j-factor and friction factor for U- and V-shaped MCHXs were developed using dimensionless parameters that reflect geometric and operating conditions. Hence, a U-shaped MCHX with a longer tube length was recommended to obtain a high absolute heat transfer rate, while a flat-type MCHX was recommended to realize high compactness and heat transfer efficiency. (C) 2021 Elsevier Ltd. All rights reserved.
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