Thermo-hydraulic efficiency and correlation development of an indoor designed jet impingement solar thermal collector roughened with discrete multi-arc ribs
- Authors
- Kumar, Raj; Kumar, Sushil; Nadda, Rahul; Kumar, Khusmeet; Goel, Varun
- Issue Date
- 1-Apr-2022
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Keywords
- Artificial roughness; Thermo-hydraulic performance; Solar air heater; Jet impingement; Multi-arc shaped ribs
- Citation
- RENEWABLE ENERGY, v.189, pp.1259 - 1277
- Journal Title
- RENEWABLE ENERGY
- Volume
- 189
- Start Page
- 1259
- End Page
- 1277
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/88439
- DOI
- 10.1016/j.renene.2022.03.037
- ISSN
- 0960-1481
- Abstract
- The present work examines the combined influence of artificial roughness and jet impingement on the performance of solar air heater (SAH). The impingement jet SAH is roughened with discrete multi-arc shaped ribs. The experiment is performed by varying the Reynolds number (Re) from 3000 to 19,000. The different roughness parameters of multi-arc ribs varied during experimentation are as follows; relative discrete distance (D-d /L-v) from 0.27 to 0.86, relative discrete width (g(w)/H-r) from 0.32 to 1.72, relative rib height (H-r/H) from 0.025 to 0.047, relative rib pitch (P-r/H) from 0.58 to 3.1, arc angle (aa) from 35 <= to 65 <=, the streamwise pitch ratio (X/D-h) from 0.47 to 1.72 and spanwise pitch ratio (Y/D-h) from 0.46 to 0.82. The Nusselt number (Nu) and friction factor (f ) for roughened solar thermal collector are found to be 7.61 and 6.48 times higher than that of smooth channel. A thermal-hydraulic performance of 4.1 is obtained for the array of designed parameters. The correlations are also established for Nu and f using experimental data. So, utilizing roughness element along with jet impingement in SAH is found to have a substantial impact on its thermo-hydraulic performance (hthp). (C) 2022 Elsevier Ltd. All rights reserved.
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