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The effect of the airflow pattern inside air gaps on the assessment of interstitial mould: A theoretical approach
Building Services Engineering Research and Technology ( IF 1.7 ) Pub Date : 2021-05-25 , DOI: 10.1177/01436244211020470
Spyridon Efthymiopoulos 1, 2 , Hector Altamirano 2, 3 , Yasemin Didem Aktas 1, 2
Affiliation  

Internal wall insulation is one of the few, possibly, the only feasible solution to efficiently reduce heat losses through the external walls of buildings where the application of external insulation is not an option, for example, in conservation areas. However, the application of this intervention may lead to unintended consequences, such as moisture accumulation and mould growth. Currently, no international standards and regulations exist to evaluate these hazards via non-destructive inspections. Air sampling through impaction and culture-based analysis was suggested in previous research as a potential non-disruptive methodology for interstitial mould testing. The method requires the perforation of the inner side of a wall and the creation of airflow through the operation of a pump, to allow the collection of particles from the confined space of interest. The present study aimed to assess the location of perforations and their effect on the airflow created and the airflow pattern variations due to changes in the airflow velocity at the outlet. Results regarding airflow features such as the turbulence intensity, dynamic pressure and volume-averaged velocity were also extracted and discussed.

Practical application: The rapid changes in climate and net-zero emissions targets call for major improvements of the existing building stock towards a more sustainable future. The installation of internal wall insulation is one of the few and might be the only feasible solution for the efficient reduction of heat losses through uninsulated walls. However, this intervention might lead to moisture accumulation and thus moisture-related problems such as mould growth. This study aims to build upon previous work on interstitial mould growth assessment and contribute to the development of a well-defined testing protocol for building professionals.



中文翻译:

气隙内部气流模式对间隙模具评估的影响:一种理论方法

内墙隔热是少数有效地减少建筑物外墙热量损失的可行解决方案之一,而在例如保护区等情况下,不能采用外墙隔热是不可行的。但是,应用此干预措施可能会导致意想不到的后果,例如水分积累和霉菌滋生。当前,尚无国际标准和法规通过无损检查来评估这些危害。在以前的研究中,建议通过撞击和基于文化的分析进行空气采样,作为间质性霉菌测试的一种潜在的无干扰方法。该方法需要在壁的内侧打孔并通过泵的操作产生气流,以便从狭窄的目标空间收集颗粒。本研究旨在评估穿孔的位置及其对产生的气流的影响,以及由于出口处气流速度的变化而导致的气流模式变化。还提取并讨论了与气流特征有关的结果,例如湍流强度,动压和体积平均速度。

实际应用:气候和零排放目标的迅速变化要求对现有建筑存量进行重大改进,以实现更可持续的未来。内墙保温的安装是为数不多的安​​装方法之一,可能是有效减少通过非保温墙的热损失的唯一可行的解​​决方案。但是,这种干预可能导致水分积聚,从而导致与水分有关的问题,例如霉菌生长。这项研究的目的是在先前关于间隙霉菌生长评估的工作的基础上,并为开发针对建筑专业人士的定义明确的测试协议做出贡献。

更新日期:2021-05-26
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