Abstract
The authors undertook research on the proper strategy of operation of educational building with gravitational ventilation in historic city center with high concentration of particulate matter PM10 and PM 2.5. In this facility the momentary increase in carbon dioxide concentration is often very high, and at the same time health requirements regarding atmospheric aerosol should be absolutely met. That is why long-term measurements of PM concentration outside and inside, as well as carbon dioxide concentration inside were carried out. CO2 was used also as a tracer gas for measurement of air change intensity. The article presents the first results of these tests and a correlation that occurs between the external and internal concentration of particulate matter PM 10 and PM 2.5. Due to a significant filtration effect of the external building envelope and particle deposition a potential conflict between required gravitational ventilation intensity and internal air pollution with particulate matters was partially reduced.
Highlights
Two things work against Krakow’s air quality: pollution and geographical factors that prevent the dispersal of pollution
Due to the wide use of coal for apartment heating and intense urban traffic in the historic city centre, emission of pollutants is high, which causes a high concentration of atmospheric particulate matter PM10 and PM2.5
The decay of the tracer gas allows for calculation and evaluation of ventilation system efficiency
Summary
Two things work against Krakow’s air quality: pollution and geographical factors that prevent the dispersal of pollution. A city of great historical value and the former capital of Poland, is located in a very large valley. This unfavourable location makes natural ventilation of the city very difficult and for many days of the year the air speed is very low here. The authors undertook research on the proper strategy of operation of buildings with gravitational ventilation in these conditions, and in particular educational buildings. In these facilities, in densely occupied spaces, the momentary increase in carbon dioxide concentration is often very high, and at the same time health requirements regarding atmospheric pollutions should be absolutely met. The infiltration tightness of the monitored room was tested by means of the pressure method and random air exchange measurements ȗ ǣ Ǧ̷ǤǤ
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