Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater

Byeong-Hwa An, Kwang-Hwan Choi and Hwi-Ung Choi ()
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Byeong-Hwa An: Graduate School of Refrigeration and Air-Conditioning Engineering, Pukyong National University, Busan 48513, Republic of Korea
Kwang-Hwan Choi: Department of Refrigeration and Air-Conditioning Engineering, Pukyong National University, Busan 48513, Republic of Korea
Hwi-Ung Choi: Industry-University Cooperation Foundation, Pukyong National University, Busan 48513, Republic of Korea

Energies, 2023, vol. 16, issue 19, 1-18

Abstract: In this study, the heat transfer augmentation and friction factor of a novel type of solar air heater (SAH), which incorporates longitudinal fins and rectangular turbulators, were investigated numerically with different arrangements of the turbulators. The effects of arrangements of rectangular turbulators placed in a finned air channel on its heat transfer augmentation and friction factor are discussed for Reynolds numbers ranging from 3000 to 15,000 using commercial ANSYS 17.2 software. Four different arrangements are investigated, including Array A, which places turbulators on both the fin’s side and base surfaces at the same position; Array B, where turbulators are sequentially placed on the fin’s side and base surfaces; Array C, where turbulators are only placed on the side surface; and Array D, where turbulators are placed only on the base surface. Array A showed the highest heat transfer augmentation and friction factor among the investigated arrangements. However, the highest thermo-hydraulic performance (THP), considering both the heat transfer augmentation and friction factor, was obtained in Array B, with a value of 1.36. Consequently, Array B was regarded as the most appropriate and effective arrangement method for the finned air channel of a SAH.

Keywords: solar thermal energy; solar collector; solar air heater; Nusselt number; heat transfer enhancement; friction factor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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