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.%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 and the film. The experiment system was designedwith long wave transmittance film, and the capability of the new system was validated through the experiment. It is shown that with the same ambient environment, the indoor temperature in DV/CC system with film is 1.8% higher than that in tradition DV/CC system, and the contaminant concentration is 60% decreased under the breathing zone and 40% decreased above the breathing zone, respectively.
展开▼
