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首页> 外文会议>Advances in hygrothermal performance of building envelopes: materials, systems and simulations >Analysis of Improved Criteria for Mold Growth in ASHRAE Standard 160 by Comparison with Field Observations
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Analysis of Improved Criteria for Mold Growth in ASHRAE Standard 160 by Comparison with Field Observations

机译：通过与实地观察的比较分析ASHRAE标准160中改进的霉菌生长标准

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ASHRAE Standard 160, Criteria for Moisture-Control Design Analysis in Buildings, was published in 2009. The standard sets criteria for moisture design loads, hygrothermal analysis methods, and satisfactory moisture performance of the building envelope. One of the evaluation criteria specifies conditions necessary to avoid mold growth. The current standard requires that the 30-day running average relative humidity at the material surface be less than 80 % when the 30-day running average surface temperature is between 5°C (41°F) and 40°C (104°F). This criterion was intended to strike a balance between the need for simplicity to make the standard useful and the complex reality of mold growth, which varies with mold species and depends on the type of material, water activity, temperature, and other factors. Since the standard was published, many practitioners have maintained that the mold criterion is too stringent. Assemblies known to have satisfactory performance in the field do not meet the criterion under hygrothermal simulation. A recent addendum to ASHRAE Standard 160 replaced the simplified mold criterion with a state-of-the-art empirical model that describes mold growth and decline over time using a mold index. This model takes into account the sensitivity of the material, the surface temperature, and the surface relative humidity. This paper provides an overview of the mold index model and a series of comparisons between field observations of visible mold growth or lack thereof on wood-based sheathing and model predictions that use measured surface temperature and relative humidity values as inputs. The field data are from published studies on above-grade wood-frame wall assemblies and roof assemblies covering a range of climate zones. Our analysis indicates that the current 30-day criterion in ASHRAE Standard 160 fails many assemblies in which visible mold growth did not occur. In contrast, the mold index model predictions give better agreement with observations.
机译：ASHRAE标准160，《建筑物中水分控制设计分析的标准》，于2009年发布。该标准设定了水分设计负荷，湿热分析方法和建筑物围护结构令人满意的水分性能的标准。评估标准之一指定了避免霉菌生长的必要条件。当前标准要求，当30天的平均运行表面温度在5°C（41°F）和40°C（104°F）之间时，材料表面的30天的运行平均相对湿度应小于80％。 。该标准旨在在使标准易于使用的简单需求与霉菌生长的复杂现实之间取得平衡，霉菌生长随霉菌种类的不同而变化，并取决于材料的类型，水活度，温度和其他因素。自该标准发布以来，许多从业人员一直认为模具标准过于严格。已知在现场具有令人满意的性能的组件不符合潮热模拟下的标准。 ASHRAE Standard 160的最新附录用最新的经验模型代替了简化的模具标准，该模型使用模具指数描述了模具随时间的增长和下降。该模型考虑了材料的敏感性，表面温度和表面相对湿度。本文提供了霉菌指数模型的概述，以及在木质护套上可见霉菌生长或缺乏霉菌指数的现场观察与使用测得的表面温度和相对湿度值作为输入的模型预测之间的一系列比较。现场数据来自已发布的有关覆盖多个气候带的高档木结构墙组件和屋顶组件的研究。我们的分析表明，ASHRAE标准160中当前的30天标准使许多未出现可见霉菌生长的组件失效。相反，结晶器指数模型的预测与观察结果具有更好的一致性。

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