Abstract

In this study, effect of air change rate (air change per hour – ACH) on indoor particle dispersion and deposition in a ventilated room is investigated. A reduced-scale model is designed to conduct experiments. Numerical predictions are performed by using the commercial software ANSYS Fluent 16.0. Four different values of the air change rate (1.73, 2.88, 5.76 and 7.68) and five different values of the particle diameter (0.181, 2.188, 4.42, 8.89 and 17.8 μm) are considered. Constant particle flow rate and proportional particle flow rate with inlet velocity cases are examined comparatively. Results show that, except from some inconsistencies for the largest particle diameter due to the accumulation and outlet opening location, the contaminant level decreases with increasing air change rate for a constant value of the particle flow rate while an opposite trend is observed for the proportional particle flow rate case.

摘要

在这项研究中，研究了换气率（每小时换气量 - ACH）对通风房间内室内颗粒扩散和沉积的影响。设计了一个缩小比例的模型来进行实验。通过使用商业软件 ANSYS Fluent 16.0 进行数值预测。考虑了四个不同的换气率值（1.73、2.88、5.76 和 7.68）和五个不同的粒径值（0.181、2.188、4.42、8.89 和 17.8 μm）。比较研究了恒定粒子流量和与入口速度成比例的粒子流量情况。结果表明，除了由于堆积和出口位置造成的最大粒径不一致外，