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<p>As the world moves towards sustainable development, the need for efficient solar thermal technologies has become increasingly important. Among these, solar parabolic trough collectors (PTCs) are widely recognized for their ability to harness solar radiation for thermal applications. On comparing water, this paper explains the experimental evaluation and development of a PTC system using aluminium oxide (Al<sub>2</sub>O<sub>3</sub>) nanofluid as the heat transfer fluid (HTF) under Southern Indian climatic conditions. The system features a selective black-coated copper absorber tube enclosed within a transparent glass cover, along with an acrylic reflective surface. According to the experimental data, the PTC system demonstrated a performance gain of roughly 18–20%, with a maximum thermal efficiency of 73% with (Al<sub>2</sub>O<sub>3</sub>) nanofluid and 55% with pure water. This improvement is attributed to the enhanced thermophysical behaviour of (Al<sub>2</sub>O<sub>3</sub>) nanofluid, including higher thermal conductivity and improved heat transfer capability. These results demonstrate the potential of (Al<sub>2</sub>O<sub>3</sub>) nanofluids as an alternative for traditional fluids in solar thermal systems, appropriate for both industrial and residential settings, and aiding in the wider uptake of sustainable energy technology. The system also reflects promising results in terms of economic sustainability. The Yearly Heating cost of water was calculated to be ₹1476.69, reflecting a highly economic performance. Yearly Heating cost of water per kilogram using the PTC system was as low as ₹0.79, making it an attractive option. The estimated Return of Investment stands at 7.30&#xa0;years with subsidy support and 7.66&#xa0;years without, underscoring the system’s long-term cost-effectiveness and economic viability.</p>

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Effect of nano particles on thermal efficiency of solar parabolic trough collector: a sustainable solution for water heating applications

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Susant Kumar Sahu,
  • Pavan Sai Kandregula,
  • Sai Krishna Gummalla

摘要

As the world moves towards sustainable development, the need for efficient solar thermal technologies has become increasingly important. Among these, solar parabolic trough collectors (PTCs) are widely recognized for their ability to harness solar radiation for thermal applications. On comparing water, this paper explains the experimental evaluation and development of a PTC system using aluminium oxide (Al2O3) nanofluid as the heat transfer fluid (HTF) under Southern Indian climatic conditions. The system features a selective black-coated copper absorber tube enclosed within a transparent glass cover, along with an acrylic reflective surface. According to the experimental data, the PTC system demonstrated a performance gain of roughly 18–20%, with a maximum thermal efficiency of 73% with (Al2O3) nanofluid and 55% with pure water. This improvement is attributed to the enhanced thermophysical behaviour of (Al2O3) nanofluid, including higher thermal conductivity and improved heat transfer capability. These results demonstrate the potential of (Al2O3) nanofluids as an alternative for traditional fluids in solar thermal systems, appropriate for both industrial and residential settings, and aiding in the wider uptake of sustainable energy technology. The system also reflects promising results in terms of economic sustainability. The Yearly Heating cost of water was calculated to be ₹1476.69, reflecting a highly economic performance. Yearly Heating cost of water per kilogram using the PTC system was as low as ₹0.79, making it an attractive option. The estimated Return of Investment stands at 7.30 years with subsidy support and 7.66 years without, underscoring the system’s long-term cost-effectiveness and economic viability.