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<p>This study explores the influence of glazing material colour on the thermal performance of solar collectors, focusing on variations in light wavelength that affects the transmissivity, reflectivity, and absorptivity of solar radiation by the collector absorber. To investigate this, three distinct colour polyethylene materials—yellow, white, and blue—were utilized as top covers for the collector and dryer chamber, forming a single drying unit within a solar cabinet dryer. The performance assessment criteria included thermal performance, exegetic efficiency, sustainability metrics, and energy payback time. The findings indicate that the yellow-colour dryer achieves the highest exegetic efficiency (22.5%), sustainability index (1.297), and exergy recovery ratio (0.00309). Conversely, the white-colour dryer demonstrates the lowest exegetic efficiency (19.3%), sustainability index (1.273), and exergy recovery ratio (0.00284). Additionally, the study reveals that the yellow-colour dryer has the shortest energy payback time (15.2&#xa0;days) and the highest annual energy output (202.28&#xa0;kW&#xa0;h), resulting in an investment payback period of approximately 3&#xa0;months. These insights are instrumental for optimizing solar dryer design to enhance exegetic efficiency, sustainability, and overall thermal performance.</p> Graphical Abstract <p></p>

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Exegetic investigation of solar collector glazing colour effects on cabinet solar dryer performance and sustainability streams for drying neem leaves

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • M. C. Ndukwu,
  • M. F. Umunna,
  • O. Enobong,
  • E. Ugwu,
  • L. Adindu,
  • L. Akuwueke,
  • B. Nkanang,
  • A. E. Ben,
  • M. Simo-Tagne,
  • F. Abam

摘要

This study explores the influence of glazing material colour on the thermal performance of solar collectors, focusing on variations in light wavelength that affects the transmissivity, reflectivity, and absorptivity of solar radiation by the collector absorber. To investigate this, three distinct colour polyethylene materials—yellow, white, and blue—were utilized as top covers for the collector and dryer chamber, forming a single drying unit within a solar cabinet dryer. The performance assessment criteria included thermal performance, exegetic efficiency, sustainability metrics, and energy payback time. The findings indicate that the yellow-colour dryer achieves the highest exegetic efficiency (22.5%), sustainability index (1.297), and exergy recovery ratio (0.00309). Conversely, the white-colour dryer demonstrates the lowest exegetic efficiency (19.3%), sustainability index (1.273), and exergy recovery ratio (0.00284). Additionally, the study reveals that the yellow-colour dryer has the shortest energy payback time (15.2 days) and the highest annual energy output (202.28 kW h), resulting in an investment payback period of approximately 3 months. These insights are instrumental for optimizing solar dryer design to enhance exegetic efficiency, sustainability, and overall thermal performance.

Graphical Abstract