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Measurements and computations of contaminant's distribution in an office environment

机译：办公环境中污染物分布的测量和计算

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This paper investigates the dispersion of contaminants in an office environment using empirical and modeling techniques. The experiment was conducted in an environmental test facility with the mock-up of two typical office layouts. Layout 1 has two workstations located in the middle of the room and separated by a low-level partition, while Layout 2 has a low level-partition which separates the room into two halves with one workstation at each corner. The test facility, 6.6 m (L) x 3.7 m (W) x 2.6 m (H), is served by an air-conditioning and mechanical ventilation (ACMV) system which is capable of controlling the air temperature and airflow rates at the supply diffuser and extract grille. The contaminant's emission was generated by a constant injection of tracer gas, sulfur hexafluoride (SF_6), via a 280 mm x 200 mm surface to represent the plane source. The concentration of contaminant in the chamber for both the layouts was measured and simulated using a gas analyzer and a computational fluid dynamic (CFD) program with the Re-Normalization Group k-ε model, respectively. In general, the predicted concentration of contaminant was in good correlation with the measured concentration. However, the predicted results were always marginally lower than the measured results. The contaminant's dispersion pattern was observed to be highly dependent on the velocity flow field. The layout of furniture influenced the airflow pattern and contaminant's distribution in the office. On the whole, Layout 1 was better than Layout 2 with a lower level of contaminant at the occupant's breathing zones.
机译：本文使用经验和建模技术研究办公室环境中污染物的扩散。该实验是在环境测试设施中进行的，其中模拟了两种典型的办公室布局。布局1的两个工作站位于房间的中间，并由低层的分区隔开，而布局2的低层分区将房间分为两半，每个角落都有一个工作站。 6.6 m（L）x 3.7 m（W）x 2.6 m（H）的测试设备由空调和机械通风（ACMV）系统提供服务，该系统能够控制供应处的空气温度和气流速率扩散器和排气格栅。污染物的排放是通过不断注入示踪气体六氟化硫（SF_6）并通过280 mm x 200 mm的表面表示的平面源而产生的。分别使用气体分析仪和带有Re-Normalization Groupk-ε模型的计算流体力学（CFD）程序分别测量和模拟了两种布局中腔室中的污染物浓度。通常，污染物的预测浓度与测量浓度具有良好的相关性。但是，预测结果总是略低于测量结果。观察到污染物的分散模式与速度流场高度相关。家具的布置影响了办公室的气流方式和污染物的分布。总体而言，布局1优于布局2，在乘员的呼吸区域污染物含量较低。

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