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Influence of envelope properties on interior insulation solutions for masonry walls

机译：围护结构性能对砌体墙内部保温解决方案的影响

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摘要

Energy efficiency in historical buildings with a worth-preserving appearance can be improved with interior thermal insulation. However, interior thermal insulation may change significantly the hygrothermal performance of the building envelope and increases the risk of moisture problems in the assembly components. This paper studies the influence of different wall structures, types of exterior render and brick and vapor control strategies on the moisture performance of internally insulated walls with vapor-open insulation for different climatic conditions in Switzerland. The hygrothermal performance is simulated with a coupled heat and mass transport model and evaluated using a hygrothermal indicator, called the RHT Index. The numerical analysis indicates that the hygrothermal performance of interior insulated walls depends mainly on the moisture performance of the exterior finishing render. A capillary active render with larger liquid permeability leads to higher moisture contents in the building envelope. The influence of parameters such as masonry structure and brick type on envelope hygrothermal performance is rather small. For wall envelopes with less capillary active renders, the need to use a vapor barrier depends on the risk for water leakage and the vapor resistance of the render.
机译：内部保温可以提高具有历史价值的历史建筑的能效。但是，内部绝热层可能会显着改变建筑物围护结构的湿热性能，并增加装配部件中出现水分问题的风险。本文研究了不同的墙体结构，外部抹灰的类型以及砖块和蒸汽控制策略对瑞士在不同气候条件下采用蒸汽开放式隔热的内部隔热墙体的防潮性能的影响。利用耦合的传热和传质模型来模拟湿热性能，并使用称为RHT指数的湿热指标对其进行评估。数值分析表明，内保温墙体的湿热性能主要取决于外墙饰面抹灰的湿气性能。具有较大液体渗透性的毛细活性涂料导致建筑物围护结构中的水分含量较高。砌体结构和砖类型等参数对围护的湿热性能影响很小。对于毛细活性涂料较少的墙面信封，是否需要使用防潮层取决于渗水的风险和涂料的耐蒸汽性。

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