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The effect of cyclic moisture and temperature on mould growth on wood compared to steady state conditions

机译：与稳态条件相比，循环水分和温度对霉菌生长的影响

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摘要

Moisture and temperature are the two key environmental parameters that determine the possibility of mould growth on building materials. The time that the material is exposed to these elements is also crucial. The natural environmental conditions of relative humidity and temperature are seldom constant over prolonged time periods in a building. Instead, they vary over time, with fungi encountering both favourable and unfavourable conditions; such variable conditions affect mould growth. This paper reports findings from a laboratory study in which mould growth at alternating RH (between 90% and 60%) or temperature conditions (between 22 ℃ and 5 ℃) was studied and compared to steady state conditions. Fluctuating RH led to slower mould growth, and when the period of unfavourable/favourable conditions was longer (1 week), growth was affected more than if the duration of these conditions was short (12 h). When alternating the temperature weekly between 22 ℃ and 5 ℃, with a mean of 13 ℃, the mould growth rate was lower compared to when the temperature was held constant at 22 ℃. The mould growth under fluctuating temperature conditions was comparable to when the temperature was kept constant at 10 ℃.
机译：湿度和温度是决定建筑材料上霉菌生长可能性的两个关键环境参数。材料暴露于这些元素的时间也很关键。建筑物中长时间保持相对湿度和温度的自然环境条件很少保持恒定。相反，它们随时间变化，真菌同时遇到有利和不利条件。这种变化的条件会影响霉菌的生长。本文报告了一项实验室研究的结果，该研究研究了在相对湿度（90％至60％）或温度条件（22℃至5℃）下霉菌的生长，并将其与稳态条件进行了比较。相对湿度的波动导致霉菌生长变慢，并且当不利条件/有利条件的时间更长（1周）时，与这些条件的持续时间短（12小时）相比，对霉菌生长的影响更大。当每周温度在22℃和5℃之间交替变化（平均为13℃）时，与将温度保持恒定在22℃相比，霉菌的生长速率要低。在温度变化的条件下，霉菌的生长与温度保持在10℃时的可比性相当。

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