Research On VOCs Emission Model Of Multiple Typical Building Materials And Its Application

In the modern life,a growing number of people who begin turn their attention to the indoor living quality.And kinds of indoor decorating and refurbishing materials and furniture are manufactured and appeared in our lives.Because of the manufacturing technique,building materials inevitably emit the Volatile Organic Compounds and the pollutants have become one of the major indoor factors,even the most major,affecting the human health.Thus,Indoor Air Quality still is a hot research field in China and relevant researches had been conducted especially the mass transfer mechanism and prediction model of building materials.In previous study,most researches were focused on the VOCs emission properties of building materials and the concentration of indoor pollutants emitted from building materials was studied from on-sit survey mostly,the ability to predict the variation trend of indoor pollutants is lacked.On the other hand,most studies of building materials VOCs emission were based on a situation with one kind of building material in a certain space,few studies considered the VOCs emission from multiple building materials which is more realistic.To address the above problems,this paper has made the following research accomplishments.Firstly,a numerical model of VOCs emission from multiple building materials is developed,the concentration curves are successfully obtained by mathematical software and the numerical method is conformed to be feasible by comparing with previous classical studies.By numerical simulation,we concluded that,(1)when the key model parameters change,especially the partition coefficient(K)and initial material-phase concentration(C0),the coexisting building materials are mutual inhibition significantly and the peak concentration of coexisting situation is less than the highest concentration of single situations;(2)the final concentration trend of coexisting situation is similar to the building material with higher key model parameters;(3)air exchange rate(N)and convective mass-transfer coefficient(h)would have different effects on the emission of multiple building materials.Secondly,we adapt large chamber(one cubic meter)to estimate the key model parameter which is commonly recommended in standards to determine the VOCs emission.The experiment result shows that it is reasonable to use C-history method to determine the key model parameters in large chamber,the regression coefficients are more than 0.9 which is required in the literature,the results can also indicate that our experimental operation skills meet the standards.Thirdly,we conducted several experiments to compare the emission of coexisting building materials with the single emissions and can easily find that there exist the mutual inhibition in the coexisting situation.Because of the performance of chamber,the pollutant concentration can not reach a relatively low level and it needs further study.In the end,we reviewed several indoor air simulation software and established a software platform combined with the proposed model for predicting the indoor air quality.Moreover,we set up key model parameters’ database.