地板送风系统室内可吸入颗粒物沉降特性的试验研究  

A study on the deposition features of the inhaled particles with an under-floor air distribution system

作　　者：姚国财[1] 李念平[1] 李灿[1] 王美霞[1] 林爱麟[1] 

机构地区：[1]湖南大学土木工程学院,长沙410082

出　　处：《安全与环境学报》2008年第1期79-81,共3页Journal of Safety and Environment

基　　金：教育部博士点基金资助项目(20050532022)

摘　　要：分析地板送风系统停机后影响室内可吸入颗粒物浓度变化的因素,建立颗粒物浓度的沉降模型并求出分析解,得出颗粒物浓度随时间的变化规律。通过颗粒物浓度的沉降模型计算颗粒物的沉降损失率和沉降速度。结果表明,当室内颗粒物的粒径大于1μm时,其沉降损失率与粒径呈线性正相关;粒径小于1μm时,其沉降损失率和衰减率低于前者,但沉降稳定后的颗粒物浓度远大于前者。研究进一步证明了大粒径颗粒物的沉降主要由重力决定而小粒径的由布朗扩散力决定。The present paper has made an experimental research on the under-floor air distribution system （UFAD） in purpose to analyze the factors affecting the room-in inhale-particle concentration （IPC） so as to develop a model of IPC. The given research is done based on the model of the deposition loss rate and the deposition velocity in correspondence with the experimental data. As is found, when particles are greater than 1 μm, the relation of the deposition loss rate and particle size would be Linear in nature, But, if the particles are smaller than 1μm, their deposition loss rate and attenuation rate would he lower than those larger than 1μm. This tendency tends to occur at the concentrations signiflcantly above the partieles larger than 1 μm. Further proofs can be found with the gravitational settling velocity. That is, for the smaller particles（diameter 〈 0.1μm）, the gravitational settling seems relatively insignificant, because smaller particles have lower deposition velocities than the coarse particles, and therefore their concentrations in the room-in conditions are not likely to decrease as much due to the deposition.

关 键 词：通风与空调工程 沉降损失率 可吸入颗粒物 室内空气品质 地板送风 

分 类 号：TU834[建筑科学—供热、供燃气、通风及空调工程]