Study On The Characteristics Of Indoor Volatile Organic Compounds And The Influence Of Thermal And Humid Environment On Existing Buildings On Campus

Unlike the VOC caused by material emission in general residential buildings,human-emission is the main source of pollution in densely occupied environment.Human emission is in a complex way and easily affected by temperature and humidity.In this paper,based on the above key points,a combination of actual measurement,theoretical derivation and numerical simulation is used to quantitatively study the characteristics of indoor VOCs and the effects of heat and humidity on existing campus buildings,and propose corresponding control strategies based on this characteristic.The main academic contributions include:（1）Summarized the mechanism of human VOC emission in the literature,and divide it into two categories:“natural emission”and“chemical reaction”according to the emission method.Natural emission includes human breathing and skin（surface）emission,and chemical reactions are divided into surface reactions and gas phase reactions.Further clarify the main target pollutants related to indoor human body,specific sources and process mechanism,and further quantitatively analyze the influence of heat and humidity.（2）Taking the existing campus buildings as the representatives of densely occupied environment,the influence of environmental heat and humidity characteristics on indoor TVOC concentration and emission intensity was studied.It was found that the change of indoor TVOC concentration is similar to the change of indoor CO₂ concentration,and both of them present a significant positive correlation.Further estimated of single emission intensity shows that the single TVOC emission intensity in summer is significantly higher than in other seasons.（3）Established the theoretical model of indoor VOC emission with the combination of the pathway and mechanism of human VOC emission and expounded the specific ventilation model,source emission model,adsorption model and reaction model with the combination of the influence of temperature and humidity.Nine materials were selected for numerical simulation analysis with the combination of actual measurement results of large samples and the species of VOCs emission by the human concerned in the current related research.（4）Through the numerical simulation method to simulate the natural emission and chemical reaction process of indoor VOCs,explore the influence of environmental temperature and humidity on the emission,and evaluate the changes of different indoor VOCs substances under different personnel activities.（5）According to the emission characteristics of indoor VOCs in existing buildings on campus,the correlation between indoor VOCs and the number of indoor personnel and indoor CO₂ concentration was found.This method could guide better indoor air quality control.