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<p>The design and selection of pipe geometries in serpentine radiant cooling panels may influence thermohydraulic efficiency and potentially lead to higher installation costs due to the need for larger or additional components to meet cooling demands. Thus, this paper examines the influence of pipe cross-sectional geometry on the thermal and hydraulic efficiency of serpentine radiant cooling panels mounted on ceilings, employing transient Computational Fluid Dynamics (CFD) simulations. The analysis encompassed six different geometrical forms: circular, polygonal, elliptical, square, rectangular, and triangular, evaluated under a range of mass flow rates (0.004–0.016&#xa0;kg/s) and inlet temperatures (15–21&#xa0;°C), while keeping the hydraulic diameter consistent. The simulations were validated against both analytical and experimental data, demonstrating an accuracy level with an error margin not exceeding 5.8%. The outcomes indicated that the triangular configuration (Mo.6) provided the highest cooling performance, achieving enhancements of up to 2.3 times compared to the standard circular model (Mo.1). The above cross-section also produced up to a 52% reduction in pressure drop, plus over 58% improvement in overall system efficiency. These improvements were maximal at low coolant temperatures and high flow rates. These findings highlight the critical role of geometric optimization in contributing to better cooling performance and lower energy use in radiant cooling systems.</p>

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Influence of Pipe Cross-Sectional Geometry on Thermal and Hydraulic Characteristics of Radiant Ceiling Cooling Systems

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Sinan AbdulGhaffar Ali,
  • Mohd Sharizal Abdul Aziz,
  • C. Y. Khor,
  • Krishnamoorthy Ramalingam

摘要

The design and selection of pipe geometries in serpentine radiant cooling panels may influence thermohydraulic efficiency and potentially lead to higher installation costs due to the need for larger or additional components to meet cooling demands. Thus, this paper examines the influence of pipe cross-sectional geometry on the thermal and hydraulic efficiency of serpentine radiant cooling panels mounted on ceilings, employing transient Computational Fluid Dynamics (CFD) simulations. The analysis encompassed six different geometrical forms: circular, polygonal, elliptical, square, rectangular, and triangular, evaluated under a range of mass flow rates (0.004–0.016 kg/s) and inlet temperatures (15–21 °C), while keeping the hydraulic diameter consistent. The simulations were validated against both analytical and experimental data, demonstrating an accuracy level with an error margin not exceeding 5.8%. The outcomes indicated that the triangular configuration (Mo.6) provided the highest cooling performance, achieving enhancements of up to 2.3 times compared to the standard circular model (Mo.1). The above cross-section also produced up to a 52% reduction in pressure drop, plus over 58% improvement in overall system efficiency. These improvements were maximal at low coolant temperatures and high flow rates. These findings highlight the critical role of geometric optimization in contributing to better cooling performance and lower energy use in radiant cooling systems.