Method of article_[ Assessment of pre-filter systems to control indoor inflow of particulate matter]

The data were prepared to explain the analysis method and concept of the pre-filter system used in the article [Assessment of pre-filter systems to control indoor inflow of particulate matter]. Ventilation systems are installed to introduce outdoor fresh air into indoor environments in an effort to improve indoor air quality. However, as the concentrations of outdoor particulate matter are increasing, additional measures are required to reduce these concentrations in the incoming outdoor air in ventilation systems. This study used a multi-step process to investigate these issues. First, we determined the current status of indoor fine particulate matter (PM2.5) concentrations based on the filter grade of an installed ventilation system. Second, a pre-filter system with guaranteed filtering performance and usability was installed in the outdoor air duct of a ventilation system to compensate for its shortcomings; then, the reduction of indoor PM2.5 concentration was evaluated. To determine whether the filtering performance of the ventilation system was sufficient, the relationships between the indoor–outdoor PM2.5 concentrations and indoor/outdoor PM2.5 concentration ratio were established based on the World Health Organization standard concentrations. The quality of the pre-filter system was tested by installing it in two separate houses that were using the same ventilation system. The results show that based on the filter grade of the European Standards, a fine filter (F grade) or a filter of a higher grade should be used for conventional ventilation systems. By installing a pre-filter system in the conventional ventilation system, the indoor PM2.5 concentration was reduced by 31% and 69% depending on the maintenance of the ventilation system.

本数据集用于阐释文献《Assessment of pre-filter systems to control indoor inflow of particulate matter》（《颗粒物室内侵入管控前置过滤系统评估》）中所采用的前置过滤系统的分析方法与相关概念。为优化室内空气质量，建筑常配套安装通风系统以将室外新鲜空气引入室内环境。然而，伴随室外颗粒物浓度持续攀升，亟需采取额外管控措施以降低通风系统引入的室外空气中的颗粒物浓度。本研究通过多步骤研究流程对上述问题展开探究：首先，基于已安装通风系统的过滤器等级，明确当前室内细颗粒物（PM₂.₅）浓度现状；其次，在通风系统的室外空气风道中加装过滤性能与使用性能均经验证的前置过滤系统（pre-filter system）以弥补原有系统的性能短板，随后对室内PM₂.₅浓度的降低幅度进行评估。为验证通风系统的过滤性能是否满足要求，本研究以世界卫生组织（World Health Organization，WHO）的浓度标准为依据，构建了室内外PM₂.₅浓度与室内外PM₂.₅浓度比值的关联关系。为测试该前置过滤系统的性能质量，研究人员在两台配置同款通风系统的独立住宅中完成了加装测试。研究结果表明，依据欧洲标准（European Standards），常规通风系统应选用细效过滤器（F级）或更高等级的过滤装置。在常规通风系统中加装前置过滤系统后，根据通风系统的维护工况不同，室内PM₂.₅浓度可分别降低31%与69%。