Hygrothermal performance of building components and building elements — Internal surface temperature to avoid critical surface humidity and interstitial condensation — Calculation methods
建筑构件和建筑构件的湿热性能——内部表面温度 以避免临界表面湿度和间隙冷凝——计算方法
发布日期：
2012-12-14
ISO 13788:2012给出了以下简化计算方法:
建筑构件或建筑元件的内表面温度，在给定内部温度和相对湿度的情况下，低于该温度霉菌可能生长。该方法还可用于评估其他内表面冷凝问题的风险。
水蒸气扩散引起的间质冷凝风险评估。所使用的方法没有考虑许多重要的物理现象，包括材料特性随水分含量的变化；材料内的毛细抽吸和液体水分传递；空气从建筑物内通过间隙或空气空间内进入部件；材料的吸湿能力。
来自任何来源的水在两个高蒸汽阻力层之间的层中干燥所花费的时间，以及在干燥过程中在部件中其他地方发生间隙冷凝的风险。
ISO 13788:2012 gives simplified calculation methods for:
The internal surface temperature of a building component or building element below which mould growth is likely, given the internal temperature and relative humidity. The method can also be used to assess the risk of other internal surface condensation problems.
The assessment of the risk of interstitial condensation due to water vapour diffusion. The method used does not take account of a number of important physical phenomena including the variation of material properties with moisture content; capillary suction and liquid moisture transfer within materials; air movement from within the building into the component through gaps or within air spaces; the hygroscopic moisture capacity of materials.
The time taken for water, from any source, in a layer between two high vapour resistance layers to dry out and the risk of interstitial condensation occurring elsewhere in the component during the drying process.
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