新建建筑外围护结构热湿状态变化实验研究

Experimental Study on Thermal and Psychrometric State Variations for External Building Envelope of New Building

在西安某地建立了独立的原位实验房屋,对其钢筋混凝土外墙及屋顶等外围护结构的热湿参数进行了为期一年的检测,研究新建建筑围护结构的含湿饱和度和综合传热系数随时间的变化规律。实验结果表明,房屋围护结构的含湿饱和度在建成初期约8个月内,随时间逐渐降低,由开始的约54%下降到196 d后的约26%;围护结构的综合传热系数在建成一年内随时间呈线性递减,其中外墙由开始为其设计理论值的两倍多,减小到最后约1.3倍。该文旨在为新建建筑围护结构传热性能的正确评价提供帮助。

An independent in-situ test house was set up somewhere in Xi＇an to detect thermal and humidity parameters of external building envelopes such as reinforced concrete walls and roof for a year, and study the change law of moisture saturation and comprehensive heat transfer coefficient of the building envelope of the new building with time. Experimental results showed that the moisture saturation of external building envelope decreased with time in the early eight months, falling from about 54% at the beginning to about 26% after 196 days; comprehensive heat transfer coefficient of building envelope linearly dropped with time in the first year, value of the outer wall went down from more than 2 times of the designed theory value to 1.3 times. This paper aimed at providing assistances to correct evaluations on heat transfer performance of envelope enclosure of new building.