Porous Building Materials Contamination Emission Model Of Research And Analysis

Indoor air quality (IAQ) issues have been greatly concerned in the past years. Researches showed that the indoor air pollution in civil buildings had badly influenced the health, comfort and lowered the productivities of people within. Field investigations also demonstrated that the residents in buildings of bad IAQ frequently complained many ill symptoms, like headache, dizziness, and discomfort from eyes and pneogaster. Meanwhile, the volatile organic compounds (VOCs) emitted from building materials were one contaminant with the most importance and frequency. The means we often take to handle the issues is to increase the quantity of ventilation, but this will also bring us more energy consumption. In addition, sometimes the outdoor air introduced in may also worsen the IAQ. We need to further the relevant research regarding this problem.The IAQ research in China is still at the beginning and most concern were paid to the survey of subject feeling on IAQ. The researches on the correlation between building materials and IAQ, and establishing of relevant regulation were also in the early stage. Very few study on regularity of the VOCs, especially that emitted from indoor materials, have been carried out up to now.This paper has done a systematic study on this issue. Firstly, it reviewed and analyzed existing research, home and abroad, on VOCs emission regularities from common porous building materials, and then adjusted and set the method and content of the new study. Later on, it investigated the regulations on IAQ and made a comparative research. From it, the author proposed a new scientific method for regulation establishing, pointed out the existing problems and got some new openings concerning this issue. Basing on the mass transfer theory and relative experience, this paper proposed a suitable numerical model, which may be applied to the study on VOCs emission. It was then exerted to simulate and analyze the mutual impact of different pollution sources and their influence on the IAQ. Further more, this paper focused on the internal distribution of pollutants in the porous building materials, and explored the impacts of internal and external factors on the pollutant emission. After that, it discussed and expanded the new model and existing research in order to findsome openings for the future work.