温度变化对板材内VOC散发特性影响的研究  

Temperature Influence on VOC Emission from Building Materials

作　　者：徐腾飞 郑晓红[1] 

机构地区：[1]东南大学能源与环境学院

出　　处：《建筑热能通风空调》2013年第1期33-36,76,共5页Building Energy & Environment

基　　金：国家自然科学基金青年项目(No.51008063)

摘　　要：扩散系数及分配系数受温度的影响,为系统地研究温度对VOC散发的影响,本文建立了基于传热传质理论下板材内VOC散发的连续模型,并用该模型对常用板材中VOC的散发进行分析。模拟结果同计算的理论值以及实验数据均能较好的吻合。当温度从18℃升高到50℃时,不论是初始时刻的VOC散发速率还是散发稳定时刻的浓度值,都有明显的升高,散发24小时后,板材在50℃下的散发量约为30℃下散发量的2.5倍;同时本文对环境温度t f波动情况下的VOC散发结果模拟表明:空气中污染物在材料表面表现出沉降与二次挥发的现象。对密闭小室中板材内部VOC分布的模拟结果表明,随着散发时间的推移,材料内部的污染物浓度将逐渐趋于均匀。The emission of Volatile Organic Compounds （VOCs） from dry building materials was mainly effected by diffusion coefficient and partition coefficient. In order to study the temperature influence on VOC emission, this paper presents VOC emission model based on heat and mass transfer theory, numerical simulation results agree well with theoretical and experimental results in the literature. Both the emission rates and the VOC concentration in the air have a significant increase when air temperature increased from 30 to 50℃. Simulation results of the building material in static chamber demonstrated that VOC concentration in the material would be uniform eventually.

关 键 词：有机挥发性化合物温度传质系数密闭环境舱 

分 类 号：TU564[建筑科学—建筑技术科学]