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IAQ Simulator tests: VOC emissions from hidden mould growth

机译：IAQ模拟器测试：隐藏模具增长的VOC排放

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Clean indoor air is a prerequisite for the welfare of the society. The Indoor Air Quality simulator (IAQ simulator) offers a research tool for building physic and building material research to evaluate the effect of the complicated causal connections of indoor air quality and multilayer building structures, materials and their unexpected exposure to moisture and microbial growth. In Microdiverbuild-project, the IAQ simulator was used to assess the drift of microbial metabolites (e.g. volatile metabolites of micro-organisms, MVOC) from a moisture damaged wall structure into indoor environment under various material moisture loads and pressure differences over the structure. Even low under-pressure has been found to cause infiltration of impurities in the indoor environment but unnecessary high under-pressure indoors increases further concentrations of impurities from the building structures. Also, infiltration of microbial gaseous contaminants from active mould growth inside the structure decreases indoor air quality. The wood laths were covered by active mould growth, and represented a mould damaged wall structure (mould index 4-5). These laths were assembled inside the wall and simulated a hidden active mould growth having air leakage routes through the envelope. Two pressure difference levels simulated normal (low pressure difference) and unbalanced ventilation when pressure difference may increase as high as-20 Pa.The simulation test showed clearly MVOCs indicating hidden microbial growth. In our previous study, VOC profiles were developed based on building occupants complaints about poor IAQ, and found high ketone concentrations indicate mould problem which is equal with results of this study. However, it is known that MVOCs can be released from other sources in real buildings and the impact of relative humidity of the material is remarkable.
机译：清洁室内空气是社会福利的先决条件。室内空气质量模拟器（IAQ Simulator）为建筑物理和建筑材料研究提供了一种研究工具，以评估室内空气质量和多层建筑结构，材料和意外暴露于水分和微生物生长的复杂因果关系的效果。在MicrodiverBuild-Project中，IAQ模拟器用于评估在各种材料水分载荷和结构上的压力差异下的水分损坏的壁结构中的微生物代谢物（例如微生物，MVOC的挥发性代谢物）漂移（例如，微生物，MVOC的挥发性代谢物）。已经发现甚至低于压力的压力甚至导致室内环境中的杂质渗透，但在室内不必要的高压下压力增加了建筑物结构的进一步浓度的杂质。此外，在结构内部的主动模具生长的微生物气态污染物的浸润降低了室内空气质量。木板用活性模具生长覆盖，并表示模具损坏的壁结构（模具指数4-5）。这些板条在墙壁内部组装，并模拟通过信封的空气泄漏路线的隐藏有源模具生长。两种压力差水平模拟正常（低压差）和当压力差可能增加时的低压差异，不平衡通气，仿真试验显示明显的MVOC，表明隐藏的微生物生长。在我们以前的研究中，基于建筑物占用者对贫困IAQ的投诉开发了VOC型材，发现高酮浓度表明模具问题与本研究结果相等。然而，已知MVOC可以从实际建筑物中的其他来源释放，并且材料的相对湿度的影响是显着的。

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