A novel low-temperature radiant structure (LTRS) has been developed to create local thermal environment and thermal comfort. This design incorporates an air layer that separates the air-contact surface from the radiant cooling surface, which enables low-temperature radiant cooling, increases cooling capacity and reduces condensation risk. The study addresses the concern of whether the LTRS with low-temperature radiant cooling would degrade thermal comfort. Heat transfer models of the LTRS were developed, and agreed well with the experimental results with difference within ±0.3 °C. Four cases with radiant surface temperatures of 27.9, 15, 10 and 5 °C were investigated, and in all cases a consistent operative temperature was maintained. This study evaluated various parameters, including the air temperature and velocity distributions, mean radiant temperature, operative temperature, and thermal comfort indices. Results indicated that the application of the LTRS increased the supply air temperature by 1.6 °C, suggesting significant energy-saving potential ranging in 28.4 %–52.7 % compared to traditional all-air cooling systems. Moreover, both general and local thermal comfort under the regulation of the LTRS satisfied the criteria in the ASHRAE Standard 55. These findings demonstrate that the novel LTRS has the capability of improving energy efficiency while maintaining satisfactory levels of thermal comfort. This study provides valuable insights and serves as a reference for promoting the use of personalized radiant cooling systems and enhancing building energy efficiency.

中文翻译：

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使用 CFD 模拟新型低温辐射结构的局部热环境和热舒适度

一种新型的低温辐射结构（LTRS）被开发出来，以创造局部热环境和热舒适度。该设计采用空气层，将空气接触表面与辐射冷却表面分开，从而实现低温辐射冷却，提高冷却能力并降低冷凝风险。该研究解决了采用低温辐射冷却的 LTRS 是否会降低热舒适度的问题。建立了LTRS的传热模型，与实验结果吻合良好，误差在±0.3℃以内。对辐射表面温度分别为 27.9°C、15°C、10°C 和 5°C 的四种情况进行了研究，并且在所有情况下都保持了一致的工作温度。这项研究评估了各种参数，包括空气温度和速度分布、平均辐射温度、工作温度和热舒适指数。结果表明，LTRS 的应用使送风温度提高了 1.6 °C，与传统全风冷系统相比，节能潜力显着，可达 28.4%–52.7%。此外，LTRS 调节下的总体和局部热舒适度均满足 ASHRAE 标准 55 中的标准。这些研究结果表明，新型 LTRS 能够提高能源效率，同时保持令人满意的热舒适度。该研究为推广个性化辐射制冷系统的使用、提高建筑节能提供了宝贵的见解。