Study on evaluation of ventilation effectiveness with change of boundary condition and application of air conditioning design

本研究提出了一种新的通风效率指标PFR，并提供了通风风量的数据基础。由于室内通风效率不是均匀的，需要测量某一点或某一领域通风效率的指标，PFR成为衡量尺度通风效率的有用指标。PFR对应于清除污染物的有效风量率，或者换句话说，通过给定域的有效通风空气的风量率。PFR对占领区的评价也很有用。影响占领区通风效率或PFR的因素有“占领区设置的隔断”、“温差”、“进排气口位置”等。通过实验测量和计算机模拟，系统地分析了这些影响。部分实验是在房间的精确模型中进行的，目的是测量：(1)气流的速度分布；(2)温度和污染物的分布。另一部分采用CFD对通风效率和PFR进行了系统分析。

In this research, we developed a new index of ventilation efficiency 'Purging Flow Rate (PFR) ', and also provided the data base of the ventilation air quantity.Since ventilation efficiency in a room is not uniform and index for measuring ventilation efficiency at a certain point or concerned domain is required, PFR becomes a useful index, of the scaling ventilation efficiency. PFR corresponds to the effective air volume rate for purging thecontaminant, or in other words, the air volume rate for effective ventilation air passed a given domain. PFR is also useful for evaluation in the occupied zone.The factors which influences the ventilation efficiency or PFR in the occupied zone are 'partitions which is set up in the occupied zone' , 'temperature difference' , 'the position of supply and exhaust opening' , and so on. We analyzed these influences systematically by adopting the experimentalmeasuring and computer simulations.Some part of the experiment was coducted in the precise model of a room, in order to measured : (1) the velocity distribution of airflow, and (2) the temperature and contaminant distribution.The other part, we analyzed the ventilation efficiency and PFR systematically by CFD.