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The performance of a closed cavity radiation system with built-in heat exchanger

机译：内置热交换器的封闭腔辐射系统的性能

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摘要

Radiant ceiling systems have good comfort levels and energy savings. However, traditional radiant air conditioning systems have many problems, such as condensation forming on the cooling surface, insufficient cooling capacity, and complex structure and control. In this paper, a closed cavity radiation system with a built-in finned heat exchanger is proposed and the heat transfer mechanism, heat transfer performance, and operation characteristics of the system are analysed. The results show that the direct-expansion large-temperature-difference heat transfer method, with refrigerant as the working medium, realises the required cold supply through the low-temperature working medium and the required heat supply through the high-temperature working medium. Heat is transferred to or from the ceiling through a multi-stage strength buffer and direction conversion so that the ceiling respectively forms a hot or cold radiant plate with uniform temperature for indoor heat exchange. The heat transfer efficiency is more than 90%, which greatly improves the cooling or heating potential of the heat exchanger, reduces the required heat exchanger area, and simplifies the installation structure. In this study, the installation area of the finned heat exchanger only accounted for 14% of the ceiling. In practical application, the number of finned heat exchanger plates can be determined according to the cooling and heating load demand, providing a reference for new radiant air conditioning system design.
机译：辐射式天花板系统具有良好的舒适度和节能效果。然而，传统的辐射式空调系统存在许多问题，例如在冷却表面上形成冷凝水，冷却能力不足以及结构和控制复杂。本文提出了一种内置翅片式换热器的封闭腔辐射系统，并分析了该系统的传热机理，传热性能和运行特性。结果表明，以制冷剂为工作介质的直接膨胀大温差换热方法，实现了通过低温工作介质所需的冷量供给和通过高温工作介质所需的冷量供给。热量通过多级强度缓冲器和方向转换传递到天花板或从天花板传出，从而天花板分别形成温度均匀的热或冷辐射板，以进行室内热交换。传热效率超过90％，大大提高了热交换器的冷却或加热潜力，减小了所需的热交换器面积，并简化了安装结构。在这项研究中，翅片式换热器的安装面积仅占天花板的14％。在实际应用中，可以根据冷热负荷需求确定散热片的数量，为新型辐射空调系统设计提供参考。

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