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<p>This study introduces an innovative enhancement to parabolic trough collectors (PTC) through the integration of phase change materials (PCM) within elliptical double-tube receivers, coupled with optimized non-uniform heat flux distribution. Employing a 3D CFD model, the thermal performance of three elliptical concentric tube orientations (ECT-0°, ECT-45°, ECT-90°) is systematically compared against conventional circular concentric tube (CCT). The results demonstrate that elliptical tube geometries markedly improve heat transfer rates, reduce thermal gradients, and significantly increase energy storage capacity. Notably, the ECT-90° configuration enhances thermal stability by about 20 %, while the ECT-0° orientation achieves a 75 % increase in the Nusselt number, translating to a 13 % boost in thermal efficiency and elevated heat transfer fluid (HTF) outlet temperatures. Crucially, the analysis of circumferential thermal stresses indicates that elliptical tubes mitigate peak and average stress levels by up to 20 % relative to circular tubes, thereby enhancing mechanical reliability. This synergistic approach, combining PCM integration with geometrical optimization, presents a robust solution for advancing the efficiency and durability of solar thermal energy systems.</p>

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Phase change material integration in elliptical double-tube receivers: A novel approach to reduce thermal stress and boost energy storage in parabolic trough collectors

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Nadhir Abdelaziz,
  • Belkacem Bouali,
  • Djemaa Guerraiche,
  • Tameur Zaitri

摘要

This study introduces an innovative enhancement to parabolic trough collectors (PTC) through the integration of phase change materials (PCM) within elliptical double-tube receivers, coupled with optimized non-uniform heat flux distribution. Employing a 3D CFD model, the thermal performance of three elliptical concentric tube orientations (ECT-0°, ECT-45°, ECT-90°) is systematically compared against conventional circular concentric tube (CCT). The results demonstrate that elliptical tube geometries markedly improve heat transfer rates, reduce thermal gradients, and significantly increase energy storage capacity. Notably, the ECT-90° configuration enhances thermal stability by about 20 %, while the ECT-0° orientation achieves a 75 % increase in the Nusselt number, translating to a 13 % boost in thermal efficiency and elevated heat transfer fluid (HTF) outlet temperatures. Crucially, the analysis of circumferential thermal stresses indicates that elliptical tubes mitigate peak and average stress levels by up to 20 % relative to circular tubes, thereby enhancing mechanical reliability. This synergistic approach, combining PCM integration with geometrical optimization, presents a robust solution for advancing the efficiency and durability of solar thermal energy systems.