Design and Performance Evaluation of a Multi-Stepped Absorber Plate Fin in a Flat Plate Solar Collector

Articles in Press

Document Type : Full Length Research Article

Authors

1 Technical Education Department Uttar Pradesh Kanpur 202480 India

2 Durgapur Institute of Advanced Technology and Management Durgapur, West Bengal 713212, India

3 Department of Mechanical Engineering, Jalpaiguri Government Engineering College West Bengal 735102, India

10.22075/jhmtr.2025.36908.1682

Abstract

This research investigates the thermal performance and optimization of a new absorber plate fin design with a double step change in thickness (rectangular profile with double step changes in local thickness, RPDSLT). It compares the thermal performance of RPDSLT to fins with simpler geometries (rectangular, trapezoidal, and rectangular with a single step change) across a wide range of geometrical parameters. Main objective of researcher in this field should be to determine the maximum fin efficiency in the less expense of fin material. So, the focus is on understanding the impact of the additional step change in RPDSLT on heat transfer efficiency and also check whether the fin efficiency is enhanced or not. The study aims to identify the optimal values of the geometrical parameters (plate fin thickness ratios, and dimensionless step lengths, that maximize efficiency. The absorber plate fin thickness plays a crucial role in solar collector efficiency. The research explores how the double step change in RPDSLT thickness affects collector efficiency compared to simpler fin designs. Detailed schematics of each fin profile and a solar collector demonstration are presented. The result shows that RPDSLT fin exhibits maximum fin efficiency roughly 5% greater than the rectangular profile with step changes in local thickness (RPSLT) fin when their geometries are optimized. Compared to rectangular and trapezoidal fins, the RPDSLT offers a smaller efficiency improvement of 1-2%. Nevertheless, the superior thermal performance of the RPDSLT design could make it a preferred choice for flat plate solar collectors despite its more intricate fabrication. The study indicates that optimal efficiency is achieved with the minimum tested step length ratios 0.1 and the maximum tested thickness ratios 0.9. Therefore, for efficient material utilization in the plate fin, it is recommended to use minimal step length ratios and maximal thickness ratios.

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Journal of Heat and Mass Transfer Research

Articles in Press, Accepted Manuscript
Available Online from 12 July 2025

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History

  • Receive Date: 15 February 2025
  • Revise Date: 27 June 2025
  • Accept Date: 12 July 2025

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