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首页> 外文期刊>International Journal of Ventilation >Prospects of Improving the Indoor Air Quality in Classrooms by Reactivating Historic Ventilation Stacks
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Prospects of Improving the Indoor Air Quality in Classrooms by Reactivating Historic Ventilation Stacks

机译：通过激活历史性的通风系统来改善教室室内空气质量的前景

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摘要

Stack ventilation systems were installed in German schools constructed around 1900 and are no longer in operation. The aim of this study was to show how reactivating these systems could improve the indoor air quality in classrooms. Ventilation stacks were reactivated in three classrooms in a school while a fourth classroom, which was naturally ventilated via openable windows, served as the reference case. All classrooms were measured for carbon dioxide levels, air temperature and relative humidity. During winter, 50% of all measured carbon dioxide values in the classroom with natural ventilation using windows were higher than 1800 ppm. All classrooms with stack ventilation showed median values of 1600 and 1350 ppm. In these classrooms, the volumetric flow rate per person in winter (14 m(3)/(h.pers)) was approximately seven times higher compared to the classroom with window ventilation (2 m(3)/(h.pers)). The supply stacks provided a preheating effect of 0.5 to 0.7 K/m. Effects of summer flow reversal were found in both of the classrooms with exhaust and supply ventilation stacks. Reactivating ventilation stacks provides the potential to improve indoor air quality in classrooms. Some adjustment of the systems, such as adding automated dampers to close the stacks at night and during flow reversal in summer, could allow the systems to meet today's hygienic and comfort requirements and turn them into modern low energy consuming systems.
机译：堆叠通风系统已安装在1900年左右建造的德国学校中，并且不再运行。这项研究的目的是展示重新激活这些系统如何改善教室的室内空气质量。在学校的三个教室中重新启用了通风系统，而通过可打开的窗户自然通风的第四教室作为参考案例。测量所有教室的二氧化碳水平，空气温度和相对湿度。在冬季，教室中使用窗户进行自然通风的二氧化碳测量值中有50％高于1800 ppm。所有有烟囱通风的教室的中位值分别为1600和1350 ppm。在这些教室中，冬季每人的体积流量（14 m（3）/（h.pers））是带窗通风的教室（2 m（3）/（h.pers））的大约七倍。 。供料堆提供了0.5至0.7 K / m的预热效果。在有排风和送风通风系统的两个教室中，都发现夏季气流逆转的影响。重新激活通风系统可以改善教室的室内空气质量。对系统进行一些调整，例如添加自动风门以在夜间和夏季逆流期间关闭烟囱，可以使系统满足当今的卫生和舒适性要求，并将其转变为现代的低能耗系统。

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