A Study on the Heat Transfer Performance Having Perforated Fins in Air Channel for Solar Air-water Heater using CFD

Kwang-am Moon; In-han Lee; Hwi-ung Choi; Kwang-hwan Choi

doi:10.7836/kses.2022.42.4.033

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2022 Vol.42, Issue 4 Preview Page Next Page

Research Article

A Study on the Heat Transfer Performance Having Perforated Fins in Air Channel for Solar Air-water Heater using CFD 전산해석을 이용한 태양열 공기-물 가열기 공기 채널 내 타공 핀 배치에 따른 전열 성능분석

30 August 2022. pp. 33-46

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Abstract

The solar air–water heater is a combined system of air-type and water-type collectors and a composite collector that can produce hot water and heated air in one system. Although it can maximize heat acquisition by transferring some of the heat lost from the absorbent plate and pipe toward the air duct, the heat acquisition is low due to the low heat capacity. To address this problem, several studies have been conducted using turbulent promoters in ducts. In this study, to improve the air-side heat transfer performance of the solar air–water heater, perforated fins on the bottom side of the absorption plate were arranged in various arrangements. Thereafter, computational fluid dynamics (CFD) was performed according to the flow conditions, and the heat transfer performance and pressure drop characteristics were analyzed. Results indicated that the heat transfer performance improved by at least 1.24 times to a maximum of 2.21 times, and that the pressure drop was in the range of 4.10 ~ 7.38 times, confirming the thermal hydraulic performance parameter (THPP). In the case of the performance coefficient, when perforated fins were attached side by side to the pipe, the highest performance coefficient was 1.18.

Keywords

Solar air-water heater

Perforated fins

Computational fluid dynamics

arrangement

Heat transfer

키워드

태양열 공기-물 가열기

타공 핀

전산 유체해석

배치

열전달

References

Choi, H. W., Fatkhur, R., Kim, Y. B., Son, C. H., Yoon, J. I., and Choi, K. H., CFD Analysis of the Heat Transfer Performance with Various Obstacles in Air Channel of Air-Type PV/Thermal Module, Journal of the Korean Solar Energy Society, Vol. 38, No. 2, pp. 33-43, 2018, https://doi.org/10.7836/kses.2018.38.2.03310.7836/kses.2018.38.2.033

Yu, J. S., Kim, J. H., and Kim, J. T., A Study for Improving Thermal Performance According to Variables of Perforated Baffle in Air-type PVT Collector, Journal of the Korean Solar Energy Society, Vol. 39, No. 6, pp. 83-91, 2019, https://doi.org/10.7836/kses.2019.39.6.08310.7836/kses.2019.39.6.083

Ahn, S. Y. and Kim, K. Y., Effects of Y-shaped Ribs on Heat Transfer Performance and Pressure Drop of a Solar Air Heater, Transactions of the Korean Society of Mechanical Engineers-B, Vol. 45, No. 4, pp. 225-235, 2021, https://doi.org/10.3795/KSME-B.2021.45.4.225. 10.3795/KSME-B.2021.45.4.225

Ahn, S. H., Shin, J. Y., and Son, Y. S., Pressure Drop and Heat Transfer Characteristics of a Flat-plate Solar Collector with Heat Transfer Enhancement Device, Journal of Advanced Marine Engineering and Technology, Vol. 37, No. 5, pp. 453-460, 2013, http://dx.doi.org/10.5916/jkosme.2013.37.5.453 10.5916/jkosme.2013.37.5.453

Abhay, L., Chandramohan, V. P., and Raju, V. R. K., Numerical Analysis on Solar Air Collector Provided with Artificial Square Shaped Roughness for Indirect Type Solar Dryer, Journal of Cleaner Production, Vol. 190, pp. 353-367, 2018, https://doi.org/10.1016/j.jclepro.2018.04.130. 10.1016/j.jclepro.2018.04.130

Jaurker, A. R., Saini, J. S., and Gandhi, B.K., Heat Transfer and Friction Characteristics of Rectangular Solar Air Heater Duct using Rib-grooved Artificial Roughness, Solar Energy, Vol. 80, No. 8, pp. 895-907, 2006, https://doi.org/10.1016/j.solener.2005.08.006. 10.1016/j.solener.2005.08.006

Arun Venu, A. K. and Arun, P., Simulation Studies on Porous Medium Integrated Dual Purpose Solar Collector, International Journal of Renewable Energy Research, Vol. 3, No. 1, pp. 114-120, 2013.

Shandal, J., Abed, Q. A., and Dhafer M. A.-S., Simulation Analysis of Thermal Performance of the Solar Air/Water Collector by Using Computational Fluid Dynamics, E3S Web of Conference, Vol. 180, 2020, Constanta, Romania, https://doi.org/10.1051/e3sconf/202018002015. 10.1051/e3sconf/202018002015

Mohite, A., Dual-Function Solar Collector, Master degree, Czech Technical University Environmental Engineering, 2016.

Baissi, M. T., Brima, A., Aoues, K., Khanniche, R., and Moummi, N., Thermal Behavior in a Solar Air Heater Channel Roughened with Delta-shaped Vortex Generators, Applied Thermal Engineering, Vol. 165, 113563, 2020, https://doi.org/10.1016/j.applthermaleng.2019.03.134. 10.1016/j.applthermaleng.2019.03.134

ANSYS, ANSYS Fluent 2021 R2, ANSYS Fluent Theory Guide 15, November 2013. https://www.ansys.com. last accessed on the 17^th February 2022.

Yadav, A. S. and Bhagoria, J. L., A CFD (Computational Fluid Dynamics) based Heat Transfer and Fluid Flow Analysis of a Solar Air Heater Provided with Circular Transverse wire Rib Roughness on the Absorber Plate, Energy, Vol. 55, pp. 1127-1142, 2013. 10.1016/j.energy.2013.03.066

Singh, S., Singh, B., Hans, V. S., and Gill, R. S., CFD (Computational Fluid Dynamics) Investigation on Nusselt Number and Friction Factor of Solar Air Heater Duct Roughened with Non-uniform Cross-section Transverse Rib, Energy, Vol. 84, pp. 509-517, 2015. 10.1016/j.energy.2015.03.015

Webb, R. L. and Gee, D. L., Forced Convection Heat Transfer in Helically Rib-roughened Tubes, International Journal of Heat and Mass Transfer, Vol. 23, pp. 1127-1136, 1980. 10.1016/0017-9310(80)90177-5

Information

Publisher :Korean Solar Energy Society
Publisher(Ko) :한국태양에너지학회
Journal Title :Journal of the Korean Solar Energy Society
Journal Title(Ko) :한국태양에너지학회 논문집
Volume : 42
No :4
Pages :33-46
Received Date : 2022-04-01
Revised Date : 2022-05-03
Accepted Date : 2022-06-28
DOI :https://doi.org/10.7836/kses.2022.42.4.033

Journal of the Korean Solar Energy Society ISSN:1598-6411(Print) 2508-3562(Online) 한국태양에너지학회 논문집

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