Assessment and enhancement of thermal performance for ring roughened finned jet impingement solar air heater for low-temperature applications

Mohammed Almeshaal, Murugesan Palaniappan and Matheswaran Mm

Energy, 2024, vol. 307, issue C

Abstract: The current study investigates the synergetic impact of artificial roughness with fins and jet impingement on the performance of flat plate solar air heater. The impingement jet Solar Air Heater (SAH) achieves roughening through the incorporation of conical ring shapes, strategically placed between the straight fins of the absorber plate. The analytical work focuses on maximizing the thermal and effective thermal performance by considering the design parameters: ring thickness ratio (TR/DH) ranging from 0.07 to 0.13, ring diameter to thickness ratio (Do/TR) from 1.67 to 2.67, streamwise pitch to diameter ratio (X/Do) from 4.71 to 7.71, ring diameter ratio (Do/Db) from 1.30 to 2.30, and a number of fins (n) ranging from 4 to 7 based on spanwise pitch ratio (Y/Do) from 2.92 to 5.14. A MATLAB code is created to solve governing equations and validated by comparing results with existing literature. The results indicate that the new configuration of SAH is most effective up to the Reynolds number of 10850 and produces the maximum energy and thermo hydraulic efficiency is 81.4 % and 77.4 %, respectively. It enhances the thermo hydraulic performance by 15.1 % and 4.1 % compared with conventional single pass and parallel pass jet impingement SAH. The system has the capability to increase the air temperature per unit of supplied solar heat flux, is ranging between 0.006 and 0.038 Km2/W.

Keywords: Jet impingement; Solar air heater; Ring roughness; Fins; Effective thermal efficiency (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:307:y:2024:i:c:s036054422402406x

DOI: 10.1016/j.energy.2024.132632

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