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Experimental investigation of convective heat transfer for night cooling with diffuse ceiling ventilation

机译：漫反射吊顶通风夜间冷却对流热传递的实验研究

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摘要

The convective heat transfer coefficient (CHTC) is a crucial parameter for night ventilation performance estimation. This paper investigates the heat transfer of night ventilation with diffuse ceiling ventilation (DCV) concept in an office room. A series of dynamic full-scale experiments were conducted with different thermal mass distribution schemes, air change rates per hour (ACH), and supply temperatures. The CHTC at interior surfaces with the inlet and outlet temperatures as the reference and the temperature efficiency of DCV were then derived. In most cases, the experimental CHTCs differed significantly from the CHTCs predicted by existing correlations. The presence of furniture (tables), its location, and the thermal mass installed on the walls had little influence on the CHTC at the floor. However, increasing the thermal mass of one surface can significantly augment its own surface CHTC. New correlations based on experimental CHTCs were developed for potential application in building energy simulation tools. The temperature efficiency of DCV decreased with the increase of ACH, the initial temperature difference between the supply air and indoor air, and the thermal mass level. DCV had higher temperature efficiency than the mixing ventilation and displacement ventilation, except for the case with displacement ventilation at low ACH.
机译：对流传热系数（CHTC）是夜间通风性能估计的关键参数。本文调查了在办公室室内与漫射吊顶通风（DCV）概念的夜间通风的热转印。通过不同的热质量分配方案进行了一系列动态全尺度实验，每小时空气变化率（ACH）和供应温度。然后衍生具有入口和出口温度的内表面的CHTC作为参考和出口温度和DCV的温度效率。在大多数情况下，实验CHTCs从现有相关性预测的CHTCs不同。家具（桌子）的存在，位置和安装在墙壁上的热质量对地板上的CHTC影响很小。然而，增加一个表面的热质量可以显着增加其自己的表面CHTC。基于实验CHTC的新相关性用于建设能源仿真工具中的潜在应用。随着ACH的增加，供应空气和室内空气之间的初始温差和热质量水平，DCV的温度效率降低。除了低ACH中的位移通风外，DCV具有比混合通风和位移通风更高的温度效率。

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