Modeling of air-side heat transfer and pressure drop of straight fin-tube no-frost evaporators for a household refrigera
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DOI 10.1007/s12206-020-1034-2
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1034-2 Keywords: · Straight fin-tube heat exchanger · Household refrigerator · Large fin pitch · Numerical study · No-frost evaporator
Correspondence to: Ji Hwan Jeong [email protected]
Citation: Choi, B.-J., Jeong, J. H. (2020). Modeling of air-side heat transfer and pressure drop of straight fin-tube no-frost evaporators for a household refrigerator. Journal of Mechanical Science and Technology 34 (11) (2020) 4773~4784. http://doi.org/10.1007/s12206-020-1034-2
Received November 22nd, 2019 Revised
June 2nd, 2020
Accepted August 17th, 2020 † Recommended by Editor Yong Tae Kang
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Modeling of air-side heat transfer and pressure drop of straight fin-tube no-frost evaporators for a household refrigerator Bong-Jun Choi1 and Ji Hwan Jeong2 1
2
Kitchen Appliance Company, LG Electronics, Changwon 51533, Korea, School of Mechanical Engineering, Pusan National University, Busan, Korea
Abstract
A mathematical model is proposed for predicting the air-side pressure drop and heat-transfer rate of straight fin-tube heat exchangers of a household refrigerator under nofrosting conditions. The six-sigma method is employed to optimize the preliminary critical-toquality (CTQ). The proposed model is consistent with the experimental data with an error of less than 15 %. The numerical results agree well with the experimental data. It can be applied to evaluate the thermal-hydraulic performance of a fin-tube heat exchanger with varying fin pitch along the airflow direction.
1. Introduction Various studies have been performed to improve the performance of refrigeration systems ranging from household appliances, such as air conditioners and refrigerators, to lowtemperature chillers, which have been widely used in recent years, as well as the performance of major components, such as compressors and heat exchangers. Recently, environmental concerns have become a challenge due to global warming and ozone layer depletion [1], so the energy consumption efficiency of household appliances has been strictly regulated. To cope with strengthening regulations regarding energy consumption efficiency, refrigeration system design technology has been greatly improved. Most household refrigerators are constructed using vapor compression refrigeration cycle (VCRS) technology. Research regarding refrigerators has focused on system optimization [2, 3] and performance improvement of their components, such as evaporators [4, 5], condensers [6], compressors [7, 8], expansion devices [9-11], and refrigerants [12, 13]. Recently, new refrigeration systems, such as magnetic refrigeration systems, have also been investigated. These systems have the benefit that they do not require the use of chemical refrigerants [14]. Fin-and-tube heat exchangers are widely used for most evaporators of household refrigerators because they
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