Study on characteristics of pollutant emissions from building materials and its modeling

回顾了利用小室和源/汇模型进行的建筑材料挥发性有机化合物(VOC)排放的实验，并对其中一些实验进行了安排以创建数据库系统。进行了室内实验，以识别材料的发射特性。设计了两种类型的试验室，并对其基本性能、温度分布、风速分布和气密性进行了研究。在不同的空气温度、换气量和自由气流速度条件下，测量了材料表面VOC的浓度和排放速率。将由Zhang和HagHighat提出的基于传质和流体流动原理的源模型和基于朗缪尔等温线的汇模型集成到多区域通风模型中。通过计算机模拟研究了与VOC浓度相关的参数，即施密特数、通风量、自由流和源区的风速。计算结果表明，室内空气中VOC浓度随通风量的增大而减小，随施密特数的增大而增大。然而，另外两个参数的变化对浓度的影响并不明显。此外，还对多分区通风进行了数值模拟。

Experiments of volatile organic compound (VOC) emissions from building materials using a small chamber and the source/sink models were reviewed, and some of them were arranged to create a database system. The chamber experiment to identify the characteristics of the material emissions were carried out. Two types of the test chamber were designed and investigated the basic performance, the distribution of temperature and air velocity and the air-tightness. The concentration and emission rate of VOC from the material surfaces were measured under the different conditions of air temperature, air exchange rate and air velocity at the free stream in the chamber. The source model based on the principles of mass transfer and fluid flow presented by Zhang and Haghighat and the sink model using Langmuir isotherm were integrated into a multi-zone ventilation model. The parameters related to VOC concentration, i.e.Schmidt number, ventilation rate, air velocity at the free stream and source area, were investigated by computer simulation. As a result of the calculations, the VOC concentration in the room air in decreased as the ventilation rate is increased and the concentration is increased as Schmidt number is increased. However the differences of the concentrations caused by the change of the other two parameters are not clear. In addition a numerical simulation of multi-zone ventilation was presented.