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Prediction of transient contaminant dispersion and ventilation performance using the concept of accessibility

机译：使用可达性概念预测污染物的瞬时扩散和通风性能

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摘要

Transient diffusion of indoor air and contaminant elements affects human comfort and health within short periods of time. This paper presents the method of exposure prediction under such conditions using the scales of accessibility of supplied air (ASA) and accessibility of contaminant source (ACS). These two scales describe the spreading performance of supplied air and indoor pollutants, respectively, and they can be figured out by computational fluid dynamics (CFD) simulation and then used to predict contaminant dispersion when flow field keeps unchanged. The new method in the form of an algebraic equation makes clear how the ventilating parameters affect the final indoor contaminant distribution. It can also be used to predict the possible health impact on occupants since this method covers both the concentration and the exposure duration of contaminants. A tracer gas measurement was conducted to validate the application model, and results show good agreement. Case study results show that transient diffusion differs very much from that under constant conditions, and this prediction method helps to flexibly control the ventilation system to meet specific requirements.
机译：室内空气和污染物元素的短暂扩散会在短时间内影响人类的舒适度和健康状况。本文介绍了在这种条件下的暴露预测方法，使用的是供气的可及性（ASA）和污染物源的可及性（ACS）。这两个量表分别描述了供应的空气和室内污染物的扩散性能，可以通过计算流体力学（CFD）模拟来确定它们，然后在流场保持不变的情况下用于预测污染物的扩散。代数方程形式的新方法明确了通风参数如何影响最终的室内污染物分布。由于该方法涵盖了污染物的浓度和暴露时间，因此它也可以用于预测对乘员的健康影响。进行了示踪气体测量以验证该应用模型，结果显示出良好的一致性。案例研究结果表明，瞬态扩散与恒定条件下的瞬态扩散有很大不同，这种预测方法有助于灵活地控制通风系统以满足特定要求。

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