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Study on ventilation standard based in ventilation efficiency

基于通风效率的通风标准研究

基本信息

批准号：
08305024
负责人：
MURAKAMI Shuzo
金额：
$ 5.63万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08305024/
关键词：
Ventilation Efficiency Model Experiment Numerical Simulation Visitation Frequency Local Purging Flow Rate 数値シュミレーション Local Purging Fiow Rate 精密室内模型実験必要換気量空調換気設備予測手段

项目摘要

Since ventilation efficiency in a room is not always uniformly distributed, an index for measuring ventilation efficiency at a concerned point or in a concerned local domain is required. Local ventilation efficiency is often represented by the rate of the averaged concentration of the local domain to that of exhausted air from the room. From the age theory of air, it is well-known that the averaged concentration in a room corresponds to the mean staying time of contaminant. Evaluating the domain averaged concentration means evaluating the average staying time of contaminant in the domain. It can be only one part of the whole room and can be considered as an occupied zone. Here, in this research, new index of ventilation efficiency (VF, Tp and L-PFR) are developed and analyzed. Visitation frequency (VF) and the average staying time of contaminant for one visitation in the local domain (Tp) are introduced to analyze the average staying time of contaminant in the local domain. The value o … More f VF is strongly affected by the position of the local domain in the room, in other words, the position of the local domain on the whole flow field of the room. Tp represents the property of the flow pattern in the local domain. Since VF and Tp indicate the mechanism of the domain averaged concentration, they are deeply related to local purging flow rate (L-PFR) which represents the air flow rate for defining the domain averaged concentration. Analysis of VF, Tp and L-PFR are based on the numerical method.In order to validate the results of numerical simulation, model experiment was carried out. A model was composed of (x) : (y) : (z) = 1.5m : O.7m : 1.Om cavity equipped with a O.02m width inlet and outlet slots. This cavity is divided into three smaller cavities, which is seperated by glass. The center working cavity (O.3m width, correspondance to model room), is the location where the measurements were performed, and the two other cavities (O.2m width) is the location where the same flow pattern as in the working cavity was reproduced (Guard cavity). Four boundaries (ceiling, floor, light and left walls) consists of water-cooling aluminium heat exchanger to control the wall surface temperature. Detailed data for flow fields are accumulated from this model experiment.Then, numerical simulations are carried out to analyze VF, Tp and L-PFR, concerning a actual office space and experimental model. Less

由于房间的通风效率并不总是均匀分布的，因此需要一个指数来衡量关注点或关注域的通风效率。局部通风效率通常由局部区域的平均浓度与房间排出的空气的平均浓度之比来表示。根据空气的年龄理论，众所周知，一个房间内的平均浓度与污染物的平均停留时间相对应。评估域平均浓度意味着评估污染物在域中的平均停留时间。它只能是整个房间的一部分，可以被认为是被占用的区域。在此，本研究对新的通风效率指标(VF、TP和L-PFR)进行了研究和分析。引入访问频率(VF)和污染物在局域内的平均停留时间(TP)来分析污染物在局域内的平均停留时间。…的值局部区域在房间内的位置，也就是说，局部区域在整个房间内的位置对Vf有很大的影响。Tp表示本地域中的流模式的属性。由于VF和Tp表示区域平均浓度的机理，因此它们与局部吹扫流量(L-Pfr)密切相关，局部吹扫流量代表用于定义区域平均浓度的空气流量。对VF、TP和L-PFR进行了数值分析，并进行了模型试验，验证了数值模拟的结果。模型由(X)：(Y)：(Z)=1.5m：0.7m：1.Om组成，腔内设有0.02m宽的进出口槽。这个空腔被分成三个较小的空腔，它们被玻璃隔开。中心工作腔(0.3米宽，对应于模型房间)是进行测量的位置，另外两个腔(0.2米宽)是复制与工作腔中相同的流型的位置(卫德腔)。四个边界(天花板、地板、采光和左墙)由水冷铝热交换器组成，用于控制墙面温度。然后，结合实际办公空间和实验模型，对VF、TP和L-PFR进行了数值模拟分析。较少