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<p>Solar renewable energy serves various engineering applications but suffers from inadequate thermal performance due to climate changes, heat loss, and limited usability when solar radiation is low. Current research is enhancing the effectiveness of solar heat exchangers by using a phase change material (PCM) made from a mixture of potassium nitrate (KNO<sub>3</sub>) and sodium nitrate (NaNO<sub>3</sub>). This system operates with a hybrid nanofluid that combines alumina (Al<sub>2</sub>O<sub>3</sub>) and copper oxide (CuO) in different volumes, specifically at 0%, 0.5%, 1%, and 1.5%. Effects of eutectic salt phase change materials and hybrid nanofluids on the thermal efficiency of flat plate solar collectors with solar thermal heat exchangers. The results show that the solar thermal heat exchanger using eutectic salt phase change material (PCM) with 1.5% hybrid nanofluid performed better than the traditional solar thermal heat exchanger that uses a water–glycol mixture without PCM. The current system, which operates with eutectic salt PCM and 1.5% hybrid nanofluid, achieves the highest heat transfer rate, along with latent heat storage and thermal and exergy efficiency levels of approximately 346.1&#xa0;W, 276.8&#xa0;kJkg<sup>−1</sup>, 87.5%, and 41.9%, respectively.</p>

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Integration and heat performance evaluation of NaNO3–KNO3 PCM and hybrid nanofluid configured solar thermal heat exchanger

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Manzoore Elahi M. Soudagar,
  • Aman Sharma,
  • N. Naga Bhooshanam,
  • Vinayagam Mohanavel,
  • R. Venkatesh,
  • M. Ravichandran,
  • Manikandan Ayyar,
  • Sami Al Obaid,
  • Sulaiman Ali Alharbi

摘要

Solar renewable energy serves various engineering applications but suffers from inadequate thermal performance due to climate changes, heat loss, and limited usability when solar radiation is low. Current research is enhancing the effectiveness of solar heat exchangers by using a phase change material (PCM) made from a mixture of potassium nitrate (KNO3) and sodium nitrate (NaNO3). This system operates with a hybrid nanofluid that combines alumina (Al2O3) and copper oxide (CuO) in different volumes, specifically at 0%, 0.5%, 1%, and 1.5%. Effects of eutectic salt phase change materials and hybrid nanofluids on the thermal efficiency of flat plate solar collectors with solar thermal heat exchangers. The results show that the solar thermal heat exchanger using eutectic salt phase change material (PCM) with 1.5% hybrid nanofluid performed better than the traditional solar thermal heat exchanger that uses a water–glycol mixture without PCM. The current system, which operates with eutectic salt PCM and 1.5% hybrid nanofluid, achieves the highest heat transfer rate, along with latent heat storage and thermal and exergy efficiency levels of approximately 346.1 W, 276.8 kJkg−1, 87.5%, and 41.9%, respectively.