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<p>The present research focuses on preparation and characterization of nano-coated heat transfer medium. It also focuses on its utilization and subsequent performance evaluation in half-cylindrical solar greenhouse dryer. The carbon nano tube and nano silicon carbide (CNT- nano SiC) coated heat transfer medium was successfully prepared by spray coating method. The ratio of CNT- nano SiC was optimized to be in 70:30 mass ratios and it provided the maximum coating efficiency of 83.9%. The structural, morphological and optical characteristics were found to be favorable for getting the desirable thermal characteristics of the greenhouse solar dryer. The maximum achievable temperatures in stagnation and operative conditions of the scaled-up greenhouse solar dryer were found to be 59.7&#xa0;°C and 55.9&#xa0;°C with the thermal and drying efficiencies of 77.8 and 74.8% respectively. As the effects of CNT- nano SiC coating were substantial in outdoor, stagnation and operative conditions, it could be concluded that CNT- nano SiC coating would be preferred for reaping enhanced thermal characteristics in different heat transfer media and greenhouses.</p>

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Effects of heat transfer medium with carbon nano tube and nano silicon carbide coatings on thermal characteristics of half cylindrical shaped solar greenhouse dryer

  • 期刊论文

  • 发表日期：

    2026年1月18日

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  • R. Ranjith,
  • P. J. Jegan Babu,
  • R. V. Jeba Rajasekhar,
  • T. Jeyakumaran

摘要

The present research focuses on preparation and characterization of nano-coated heat transfer medium. It also focuses on its utilization and subsequent performance evaluation in half-cylindrical solar greenhouse dryer. The carbon nano tube and nano silicon carbide (CNT- nano SiC) coated heat transfer medium was successfully prepared by spray coating method. The ratio of CNT- nano SiC was optimized to be in 70:30 mass ratios and it provided the maximum coating efficiency of 83.9%. The structural, morphological and optical characteristics were found to be favorable for getting the desirable thermal characteristics of the greenhouse solar dryer. The maximum achievable temperatures in stagnation and operative conditions of the scaled-up greenhouse solar dryer were found to be 59.7 °C and 55.9 °C with the thermal and drying efficiencies of 77.8 and 74.8% respectively. As the effects of CNT- nano SiC coating were substantial in outdoor, stagnation and operative conditions, it could be concluded that CNT- nano SiC coating would be preferred for reaping enhanced thermal characteristics in different heat transfer media and greenhouses.