置换通风
天花板(云)
通风(建筑)
环境科学
热的
热舒适性
传热系数
对流换热
材料科学
房间空气分配
机械
热质量
传热
对流
传质
核工程
气象学
工程类
物理
作者
Rui Guo,Per Heiselberg,Yue Hu,Hicham Johra,Chen Zhang,Rasmus Lund Jensen,Kim Trangbæk Jønsson,Peng Pei
标识
DOI:10.1016/j.buildenv.2021.107665
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.
科研通智能强力驱动
Strongly Powered by AbleSci AI