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<p>Evacuated tube solar collectors (ETSC) are familiar with solar thermal energy conversion due to their high thermal efficiency, reduced heat loss, durability, and better performance in cloud conditions. However, insufficient heat extraction due to higher temperatures and variations in heat transfer behaviour result in variations in the thermal performance of ETSC. This research aims to enrich the thermal performance and heat transfer characteristics of ETSC featuring polyaniline (PANI) and multiwalled carbon nanotubes (MWCNT) in ratios of 90:10 and 85:15 with a coating thickness of 0, 100, 125, and 150&#xa0;µm via the spray coating technique. By using Fourier transform infrared (FTIR) analysis, the chemical bonding between the PANI and MWCNT is confirmed. The effectiveness of PANI and MWCNT coating thickness (different ratios) on thermal performance (heat absorptance and thermal efficiency) and heat transfer performance (outlet fluid temperature and thermal conductivity) is experimentally investigated, and their results are compared. The results demonstrate that the ETSC configured with 85:15 ratios of PANI:MWCNT with 150&#xa0;µm exhibited superior thermal conductivity (0.724 Wm<sup>−1</sup>&#xa0;K<sup>−1</sup>), better fluid temperature (87.8 ⁰C), enhanced heat absorption and (1013.1 W), and high thermal efficiency (67.4%), which is better than the ETSC without coating and coated with 100 and 125&#xa0;µm of PANI:MWCNT.</p>

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Polyaniline–carbon nanotube hybrid coating thickness on thermal characteristics study on solar thermal collector

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • A. Mohana Krishnan,
  • N. Nagabhooshanam,
  • Pragati Gajbhiye,
  • Ankur Kulshreshta,
  • Indumathi S. M,
  • Alluri Samyul,
  • Debabrata Barik,
  • T. Thirugnanasambandham,
  • S. Sathiyamurthy

摘要

Evacuated tube solar collectors (ETSC) are familiar with solar thermal energy conversion due to their high thermal efficiency, reduced heat loss, durability, and better performance in cloud conditions. However, insufficient heat extraction due to higher temperatures and variations in heat transfer behaviour result in variations in the thermal performance of ETSC. This research aims to enrich the thermal performance and heat transfer characteristics of ETSC featuring polyaniline (PANI) and multiwalled carbon nanotubes (MWCNT) in ratios of 90:10 and 85:15 with a coating thickness of 0, 100, 125, and 150 µm via the spray coating technique. By using Fourier transform infrared (FTIR) analysis, the chemical bonding between the PANI and MWCNT is confirmed. The effectiveness of PANI and MWCNT coating thickness (different ratios) on thermal performance (heat absorptance and thermal efficiency) and heat transfer performance (outlet fluid temperature and thermal conductivity) is experimentally investigated, and their results are compared. The results demonstrate that the ETSC configured with 85:15 ratios of PANI:MWCNT with 150 µm exhibited superior thermal conductivity (0.724 Wm−1 K−1), better fluid temperature (87.8 ⁰C), enhanced heat absorption and (1013.1 W), and high thermal efficiency (67.4%), which is better than the ETSC without coating and coated with 100 and 125 µm of PANI:MWCNT.