Performance Evaluation of Roughened Solar Air Heaters for Stretched Parameters

Mustafa Alaskari, Arwa M. Kadhim, Ammar A. Farhan, Moustafa Al-Damook and Mansour Al Qubeissi
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Mustafa Alaskari: Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq
Arwa M. Kadhim: Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq
Ammar A. Farhan: Department of Energy Engineering, University of Baghdad, Baghdad 10071, Iraq
Moustafa Al-Damook: Renewable Energy Research Center, University of Anbar, Ramadi 31001, Iraq
Mansour Al Qubeissi: Faculty of Engineering, Environment and Computing, Coventry University, Coventry CV1 2JH, UK

Clean Technol., 2022, vol. 4, issue 2, 1-15

Abstract: Artificial roughness applied to a Solar Air Heater (SAH) absorber plate is a popular technique for increasing its total thermal efficiency ( η t − t h ). In this paper, the influence of geometrical parameters of V-down ribs attached below the corrugated absorbing plate of a SAH on the η t − t h was examined. The impacts of key roughness parameters, including relative pitch p / e (6–12), relative height e / D (0.019–0.043), angles of attack α (30–75°), and Re (1000–20,000), were examined under real weather conditions. The SAH η t − t h roughened by V-down ribs was predicted using an in-house developed conjugate heat-transfer numerical model. The maximum SAH η t − t h was shown to be 78.8% as predicted under the steady-state conditions of Re = 20,000, solar irradiance G = 1000 W/m 2 , p/e = 8, e/D = 0.043, and α = 60. The result was 15.7% greater efficiency compared to the default smooth surface. Under real weather conditions, the η t − t h of the roughened SAH with single- and double-glass covers were 17.7 and 20.1%, respectively, which were higher than those of the smooth SAH.

Keywords: absorber plate; roughened surface; solar air heater; thermal analysis; V-ribbed duct (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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