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Natural ventilation and indoor air quality in educational buildings: experimental assessment and improvement strategies

机译：教育建筑中的自然通风和室内空气质量：实验评估和改进策略

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Indoor environmental conditions in classrooms, in particular temperature and indoor air quality, influence students’ health, attitude and performance. In recent years, several studies regarding indoor environmental quality of classrooms were published and natural ventilation proved to have great potential, particularly in southern European climate. This research aimed to evaluate indoor environmental conditions in eight schools and to assess their improvement potential by simple natural ventilation strategies. Temperature, relative humidity and carbon dioxide concentration were measured in 32 classrooms. Ventilation performance of the classrooms was characterized using two techniques, first by fan pressurization measurements of the envelope airtightness and later by tracer gas measurements of the air change rate assuming different envelope conditions. A total of 110 tracer gas measurements were made and the results validated ventilation protocols that were tested afterward. The results of the ventilation protocol implementation were encouraging and, overall, a decrease on the CO2 concentration was observed without modifying the comfort conditions. Nevertheless, additional measurements must be performed for winter conditions.
机译：教室内的室内环境条件，尤其是温度和室内空气质量，会影响学生的健康，态度和表现。近年来，发表了一些有关教室室内环境质量的研究，事实证明自然通风具有巨大潜力，尤其是在南欧气候中。这项研究旨在评估八所学校的室内环境条件，并通过简单的自然通风策略评估其改善潜力。在32个教室中测量了温度，相对湿度和二氧化碳浓度。教室的通风性能使用两种技术来表征，一种是通过对信封的气密性进行风扇加压测量，另一种是在假设不同的信封条件下，通过示踪气体测量空气变化率。总共进行了110次示踪气体测量，结果验证了随后测试的通风方案。通风规程实施的结果令人鼓舞，总体而言，在不改变舒适性条件的情况下，观察到了CO2浓度的下降。但是，对于冬季条件，必须执行其他测量。

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