加膜冷却顶板/置换通风系统及其实验研究

对冷却顶板/置换通风系统中存在的两个突出问题:冷却顶板易“结露”以及形成“下降气流”破坏置换通风的流型进行理论分析,提出了用对长波具有高透过性的薄膜包裹冷却顶板,在冷却顶板下表面和薄膜之间保留真空或空气夹层的解决方法,并且设计了实验系统,选定了长波高透过性薄膜作为实验材料,通过实验对新系统的性能进行了验证.结果表明:在外界环境基本相同的条件下,加装长波高透过性薄膜后,冷却顶板/置换通风系统的室内温度略有升高,平均升高1.8％；污染度明显下降,在呼吸区以下,平均降低60％；在呼吸区以上,平均降低40％,空气品质明显得到了提高.

Experiment on the Displacement Ventilation and Cooling Ceiling System with the Film

Currently displacement ventilation(DV) and cooling ceiling(CC) system has two main disadvantages: condensation when the radiant panel temperature is lower than the dew point temperature of air around it,and the downdraft from the cooling ceiling.Through theoretical analyses,the paper puts forward a method to avoid condensation and downdraft: the radiant panel is covered and airproofed with the film whose long wave transmittance is high,and there is a layer of air or vacuum between the undersurface of panel ...