| Nowadays,people pay more and more attention to their health conditions because the development of science and technology and the improvement of living standard.Most of the staff stay indoors,so good indoor air quality is an important guarantee for people's health.Indoor air quality is related to the concentration of indoor pollution parameters,so understanding the diffusion law of pollutants in buildings can effectively adopt appropriate control strategies to ensure the indoor air quality as good as possible.Moreover,in recent years,the area of newly built buildings in China has been increasing,among which the pollutant diffusion in decoration and decoration materials makes the concentration of indoor pollutants in buildings significantly higher than the standard limit for a long time,which is harmful to human health.Therefore,it is necessary for users to reveal the diffusion and attenuation characteristics of pollutants in newly-built buildings and accurately evaluate their indoor air quality.This paper first measured the concentration of indoor air pollution parameters in a newly decorated building.The pollutant parameters included in the test were formaldehyde,TVOC,carbon dioxide,PM2.5 and PM10.The analysis of the test results showed that the diffusion of various pollutants in the test room was different in winter and summer.The change curve of daily average concentration of pollutants shows that the change trend of formaldehyde,TVOC and carbon dioxide concentration is basically the same,while PM2.5 and PM10 show a fluctuation state,because PM2.5 and PM10 are greatly affected by outdoor factors.The entropy-fuzzy analytic hierarchy process was proposed to evaluate the indoor air quality in each office,and the results showed that the indoor air quality in winter and summer were good and average.Then,the reliability of numerical simulation results of indoor pollutant diffusion flow field is verified by summer test data.And further through a large number of working conditions of numerical simulation,different environmental parameters and pollution source location characteristics of the concentration distribution of pollutants inside the building to explore.The results show that when the concentration of pollutants in the building reaches a stable level,the increase of indoor relative humidity will reduce the diffusion of pollutants,and the increase of indoor temperature will accelerate the diffusion of pollutants,the existence of the wet diffusion will accelerate the diffusion of pollutants.The different types of pollutants released by a single pollution source will hardly affect the diffusion trajectory of pollutants,but will affect the indoor concentration and distribution of pollutants when they reach a stable state.When the diffusion of pollutants reaches a stable state,the simultaneous release of two pollutants is more complete than the simultaneous release of one pollutant.When different pollution sources are combined,the final concentration distribution trend of indoor pollutants has nothing to do with the number of pollution sources,and has something to do with the diffusion direction of pollutants and the distribution of indoor obstacles.Increasing indoor ventilation will accelerate the diffusion rate of pollutants;Indoor building sources released pollutants is a relatively slow process,when indoor pollutants diffusion is each part,and the ventilation rate must,indoor all parts TVOC content under reach regulations limit the time needed for more than 2 years,the time needed for building indoor TVOC spread out completely is longer,visible to health,when decorating,should choose more environmentally friendly materials,imported furniture and partial time;When the outdoor environment changes,the change trend of indoor pollutant concentration is not exactly the same as that of outdoor environment.This is because the outdoor parameters change into three parameters(temperature,humidity and wind speed)at the same time. |
PDF Full Text Request