Modeling to predict positive pressurization required to control mold growth from infiltration in buildings in a hot and humid climate
Modeling to predict positive pressurization required to control mold growth from infiltration in buildings in a hot and humid climate
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DOI：
10.1016/j.buildenv.2016.05.001
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发表时间：
2016-08
影响因子：
7.4
通讯作者：
W. J. Chen;D. Claridge;Chae Rohrs;Jiajun Liao
中科院分区：
文献类型：
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作者：
W. J. Chen;D. Claridge;Chae Rohrs;Jiajun Liao
美国潮湿地区的商业建筑通常被设计为在正压下运行，以限制霉菌生长、材料变质和其他与湿热气候下的渗透有关的凝结问题。本文结合现有的渗流模型和霉菌生长模型，预测了加压水平对霉菌生长风险的影响。根据墙的高度和朝向，墙的处理方式会有所不同。利用当地气象资料生成外部压力场。对实际建筑进行的温度测量被应用于多层围护结构温度预测模型，该模型用于模拟三种不同围护结构的性能。对于一个建筑类型的三个潮湿位置和一个位置中的其他两个建筑类型，计算霉菌指数的年变化。模拟结果表明，对于22摄氏度的室内温度设定点，德克萨斯州大学站一栋无压建筑中面向所有方向的3米高的墙将经历霉菌指数的每年增加。然而，1.5千帕的正压会导致所有墙壁的霉菌指数每年都出现负变化，理论上应该可以消除所有墙壁上霉菌指数增加的长期风险。该模型还表明，如果将同一建筑搬到德克萨斯州沃斯堡，只需1帕增压就能产生霉菌指数的负年度变化，而在室内温度设定值为22摄氏度的佐治亚州亚特兰大不需要增压。
Commercial buildings in humid regions of the United State are generally designed to operate at a positive pressure to limit mold growth, material deterioration and other condensation related problems from infiltration in hot and humid climates. This paper combines existing models of infiltration and mold growth to predict the influence of pressurization level on the risk of mold growth. Walls are treated differently depending on their height and the direction they face. Local weather data are utilized to generate the outside pressure field. Temperature measurements performed on an actual building are applied to a multi-layer envelope temperature prediction model, used to simulate the performance of three different envelope constructions. Annual change in mold index is calculated for three humid locations for one construction type and for two other construction types in one location. The simulated results indicate that for a 22 °C indoor temperature set-point, 3 m high walls facing all directions in an unpressurized building in College Station, TX, will experience an annual increase in mold index. However, 1.5 Pa positive pressurization results in a negative annual change in mold index for all walls that should theoretically eliminate the long-term risk of an increasing mold index on all walls. The model also indicates that only 1 Pa pressurization is required to produce negative annual change in mold index if the same building is moved to Fort Worth, TX and no pressurization is required in Atlanta, GA with a 22 °C indoor temperature set-point.