The effect of the airflow pattern inside air gaps on the assessment of interstitial mould: A theoretical approach

IF 1.5 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
S. Efthymiopoulos, H. Altamirano, Y. Aktas
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引用次数: 0

Abstract

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.
气隙内部气流模式对间隙模具评估的影响:一种理论方法
内墙保温是为数不多的,可能也是唯一可行的解决方案之一,可以有效地减少通过建筑物外墙的热量损失,例如,在保护区内,外部保温的应用是不可选的。然而,这种干预措施的应用可能会导致意想不到的后果,如水分积累和霉菌生长。目前,尚无通过无损检测来评估这些危害的国际标准和法规。在之前的研究中,通过撞击和基于培养的分析进行空气采样被认为是一种潜在的非破坏性的间隙霉菌检测方法。该方法需要在墙体内侧穿孔,并通过泵的操作产生气流,以便从感兴趣的有限空间收集颗粒。本研究旨在评估穿孔的位置及其对气流的影响,以及由于出口气流速度的变化而产生的气流模式变化。提取并讨论了湍流度、动压和体积平均速度等气流特性的结果。实际应用:气候的快速变化和净零排放目标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。安装内墙保温是为数不多的,可能是唯一可行的解决方案,有效地减少热损失通过非保温墙。然而,这种干预可能导致水分积累,从而导致与水分有关的问题,如霉菌生长。本研究旨在建立在之前关于间隙霉菌生长评估的工作基础上,并为建筑专业人员制定一个定义良好的测试协议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Building Services Engineering Research & Technology
Building Services Engineering Research & Technology 工程技术-结构与建筑技术
CiteScore
4.30
自引率
5.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Building Services Engineering Research & Technology is one of the foremost, international peer reviewed journals that publishes the highest quality original research relevant to today’s Built Environment. Published in conjunction with CIBSE, this impressive journal reports on the latest research providing you with an invaluable guide to recent developments in the field.
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