Investigation on performance enhancement due to rib roughened solar air heater. (2022)

• Record Type: Journal Article
• Authors: Yadav, Anil Singh; Mishra, Anupritha; Dwivedi, Kaustubh; Agrawal, Abhay; Galphat, Ayush; Sharma, Neeraj
• Is Part Of: Materials today. Volume 63:(2022)
• Page Start: 726
• Page End: 730
• Publication Date: 2022
• Subjects: Solar air heater -- CFD -- Nusselt number -- Friction factor -- Roughness; AR Aspect ratio -- CFD Computational fluid dynamics -- Dh Hydraulic diameter -- e Roughness height (m) -- e/D Relative roughness height -- FF Fluid flow -- fr Friction factor -- h Heat transfer coefficient (W/m2K) -- H Height of duct (m) -- HT Heat transfer -- HTC Heat transfer coefficient -- k Thermal conductivity of air (W/mK) -- L Length of test section (m) -- Nu Nusselt number -- P Pitch of roughness (m) -- P/e Relative roughness pitch -- PD Pressure drop -- SAH Solar air heater -- THP Thermohydraulic performance -- W Width of duct (m) -- W/H Duct aspect ratio -- α Angle of attack, degree -- ρ Density of fluid (kg/m3); Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2022.05.071
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Solar air heaters are widely used in industrial areas due to their economical design. However, their low thermal efficiency makes them unsuitable for transporting thermal energy. The usefulness of a solar air heater ( SAH) can be boosted by applying ribs on the absorbing surface. To measure the heat transfer (HT) rate and friction factor (f r ), the absorber plate of ribbed solar heater is designed with combination of circular and semi-circular ribs. To improve the performance of SAH, the findings of comparative research of smooth and rough SAH are presented in this article. In this research work a computational study of HT enhancement and fluid flow (FF) behaviours of a SAH having proposed ribs arranged in a different fashion are presented. The details of HT and FF behaviours due to periodic ribs have been analysed using CFD . The analysis was performed with the V 2 f model in ANSYS software. Present computational investigation was done for different P/e values and Re ranging from 3800 to 18, 000. The result showed that the proposed rib with lower pitch gives the highest Nu r at highest Re . The result also showed that the proposed rib with lower pitch gives the highest f r at lowest Re .