The effect of room size and general ventilation on the relationship between near and far-field concentrations.
The effect of room size and general ventilation on the relationship between near and far-field concentrations.
复制标题
DOI：
10.1080/104732299302530
复制
发表时间：
1999-08-01
期刊：
影响因子：
--
通讯作者：
Cherrie, J W
中科院分区：
文献类型：
--
作者：
Cherrie, J W
个人接触水平的测量值通常大于或等于在工作室主体的某个固定位置发现的浓度。本文提出了一种理论分析，这种差异使用一个简单的模型，实施作为一个两室的质量平衡模型与恒定的排放率。模拟接触水平（称为近场）和浓度在一个固定的位置（远场），获得了五个房间大小（30至3000立方米），每个有五个一般通风率（每小时0.3至30换气）和三个水平的空气流动在工人附近（一般3至30立方米/分钟）。从模拟的近场到远场浓度的比例范围从1在小的通风不良的房间到24在大的通风良好的区域，这与实际测量数据相比是有利的。在每小时换气次数少于一次的小房间（< 100 m3）中获得的预测浓度几乎是较大房间的40倍。这些模拟的结果已被用来修改原来的暴露模型，以更好地反映一般通风对工人暴露的可能影响。
Measurements of personal exposure level are generally greater than or equal to concentrations found at some fixed location in the body of the workroom. This article presents a theoretical analysis of such differences using a simple model of exposure, implemented as a two-compartment mass balance model with a constant emission rate. Simulated exposure levels (termed the near-field) and the concentration at a fixed location (the far-field) were obtained for five room sizes (30 to 3000 m3), each with five general ventilation rates (0.3 to 30 air-changes per hour) and three levels of air movement in the vicinity of the worker (generally 3 to 30 m3/min). The ratio of near- to far-field concentrations from the simulations ranged from unity in small poorly ventilated rooms to 24 in large well ventilated areas, which compares favorably with actual measurement data. The predicted concentrations obtained in small rooms (< 100 m3) with less than one air-change per hour were almost 40 times higher than in larger rooms. The results from these simulations have been used to modify the original exposure model to better reflect the likely effect of general ventilation on workers' exposure.