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<p>Solar air heaters (SAHs) are prone to lower thermal efficiency owing to the reduced heat transfer coefficient (HTC) between traditional absorber plates and the working fluid (air). Mitigate this challenge by employing shot blasting on a trapezoidal profile absorber coupled with surface-modified encapsulation tubes containing organic phase change material (OPCM). This study assesses four different configurations, namely (i) trapezoidal profile SAH (TAPSAH), (ii) TAP with shot blasting (TAPSB), comprising OM 49 (6 tubes), (iii) TAPSB, including OM 49 (8 tubes), and (iv) TAPSB, including 10 tubes. Shot blasting expertise modifies the absorber plate’s boundary layer thickness, improving its absorption capacity. In this study, OM 49 was selected as the OPCM. The supreme average thermal efficiencies for configuration 4 (TAPSAH with 10 tubes) were detected at 61.41% and the highest average exergy efficiency of 2.894% with a flow rate (MR) of 0.045&#xa0;kg s<sup>−1</sup>. TAPSAH with 10 tubes has attained the highest average “Nu” value of 25.41 at an operated flow rate of 0.045&#xa0;kg s<sup>−1</sup>, implying its outstanding convective heat transfer compared with the other configurations. The maximal thermal augmentation index (<i>ϕ</i>) of 1.483 was recorded for OPCM when employing 10 tubes at an MR of 0.045&#xa0;kg s<sup>−1</sup>. The outcomes specified a significant advancement in performance under forced convection mode (FCM), with the mean drying efficiency reaching 18.25% compared to 14.43% under natural convection mode (NCM), with an enhancement of 26.51%. The drying models for FCM and NCM reveal an outstanding fit to the data, as shown by R<sup>2</sup> values of 0.9841 and 0.9818, based on linear regression analysis.</p>

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Synergistic impacts of shot-blasted container and absorber surfaces with organic PCM for tapioca cassava solar drying under natural and forced convection approaches

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Poongavanam GaneshKumar,
  • Palanichamy Sundaram,
  • Vanaraj Ramkumar,
  • Seong Cheol Kim,
  • Mathanraj Vijayaragavan,
  • Jamelah S. Al-Otaibi,
  • Saravanan Pandiyaraj

摘要

Solar air heaters (SAHs) are prone to lower thermal efficiency owing to the reduced heat transfer coefficient (HTC) between traditional absorber plates and the working fluid (air). Mitigate this challenge by employing shot blasting on a trapezoidal profile absorber coupled with surface-modified encapsulation tubes containing organic phase change material (OPCM). This study assesses four different configurations, namely (i) trapezoidal profile SAH (TAPSAH), (ii) TAP with shot blasting (TAPSB), comprising OM 49 (6 tubes), (iii) TAPSB, including OM 49 (8 tubes), and (iv) TAPSB, including 10 tubes. Shot blasting expertise modifies the absorber plate’s boundary layer thickness, improving its absorption capacity. In this study, OM 49 was selected as the OPCM. The supreme average thermal efficiencies for configuration 4 (TAPSAH with 10 tubes) were detected at 61.41% and the highest average exergy efficiency of 2.894% with a flow rate (MR) of 0.045 kg s−1. TAPSAH with 10 tubes has attained the highest average “Nu” value of 25.41 at an operated flow rate of 0.045 kg s−1, implying its outstanding convective heat transfer compared with the other configurations. The maximal thermal augmentation index (ϕ) of 1.483 was recorded for OPCM when employing 10 tubes at an MR of 0.045 kg s−1. The outcomes specified a significant advancement in performance under forced convection mode (FCM), with the mean drying efficiency reaching 18.25% compared to 14.43% under natural convection mode (NCM), with an enhancement of 26.51%. The drying models for FCM and NCM reveal an outstanding fit to the data, as shown by R2 values of 0.9841 and 0.9818, based on linear regression analysis.