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Study on evaluation method for cross-ventilation environment taken account of steady ventilation flow rates and thermal comfort

考虑稳定通风流量和热舒适性的交叉通风环境评价方法研究

基本信息

批准号：
18360278
负责人：
OHBA Masaaki
金额：
$ 10.88万
依托单位：
Tokyo Polytechnic University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

The field experiments, wind tunnel experiments and image analysis have been carried out. The findings of the study can be summarized as follows.(1) The local dynamic similarity model can predict discharge coefficients, which vary with wind direction and opening position, if some requirements are met. Four types of wind tunnel experiments were carried out in this study to investigate how strictly these requirements have to be met when the model is applied to inflow openings. There are no substantial problems in applying the model when the direction or profile of the tangential flow is changed or when there is a wall near the opening.(2) The local dynamic similarity model was coupled with a COMIS network model. The prediction accuracy of ventilation flow rates was verified for one-zone and two-zone building models. The coupled model achieved better predictions of discharge coefficients and ventilation flow rates than the conventional orifice flow model.(3) The airflow characteristics out … More side and inside a cross-ventilated room were measured by ultrasonic anemometers in summer 2006. The major contributions to the energy spectra of cross-ventilation are revealed in the frequency range less than 0.1Hz and that the energy spectra of cross-ventilation contain some region of wave numbers with an exponential decay of k-5/3.(4) When the air velocity was more than 0.5m/s, various air velocity changes and airflow fluctuations in time and space made subjects feel more comfortable under cross-ventilation than under airflows from the air-conditioning system.(5) The influence of air velocity fluctuations on surface temperature fluctuations of thermal mannequin was visualized in the experimental room under cross ventilated cases and under air conditioned cases. An image processing method to transfer the infrared animations to power spectrum images was proposed in order to clarify the frequency of surface temperature fluctuations.(6) The influence of building coverage ratio on ventilation performance was small rather on roofs than on walls. A roof window was found to be a very effective tool for increasing ventilation flow rates especially in densely populated area. Less

进行了现场实验、风洞实验和图像分析。研究结果可概括如下：(1)在满足一定要求的情况下，局部动态相似模型可以预测随风向和开口位置变化的流量系数。本研究进行了四种类型的风洞实验，以研究当模型应用于流入开口时必须如何严格地满足这些要求。当切向流的方向或剖面发生变化或者开口附近有墙体时，应用该模型不存在实质性问题。(2)将局部动态相似模型与COMIS网络模型耦合。针对一区和两区建筑模型验证了通风流量预测的准确性。耦合模型比传统的孔口流量模型对流量系数和通风流量进行了更好的预测。(3)2006年夏天，利用超声波风速计测量了交叉通风房间侧面和内部的气流特性。交叉通风能谱的主要贡献集中在小于0.1Hz的频率范围内，并且交叉通风能谱包含一些波数区域。指数衰减为k-5/3。(4)当风速大于0.5m/s时，不同的风速变化和气流在时间和空间上的波动使受试者在交叉通风下感觉比空调系统气流更舒适。(5)在交叉通风的实验室中可视化了风速波动对热人体模型表面温度波动的影响。通风箱和空调箱。为了明确地表温度波动的频率，提出了一种将红外动画转换为功率谱图像的图像处理方法。(6)建筑物覆盖率对通风性能的影响较小，屋顶通风性能比墙体通风性能影响小。人们发现屋顶窗是增加通风流量的非常有效的工具，特别是在人口稠密的地区。较少的

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

通風時と空調時における人体皮膚表面温度変動のパワースペクトルに関する熱画像解析その1 クラスタ分類による周波数領域別パワースペクトル特性

通风空调过程中人体皮肤表面温度波动功率谱的热图像分析第1部分使用聚类分类的频域功率谱特征

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
飯野秋成;他4名
通讯作者：
他4名

A study on evaluation on cross-ventilation performance of openings Part 24 Experimental study on discharge coefficient of outflow opening

孔口交叉通风性能评价研究第24部分出水口流量系数试验研究

DOI：
发表时间：
2007
期刊：
影响因子：
0
作者：
T. Goto;et. al.
通讯作者：
et. al.

Experimental Study on Discharge Coefficient of Outflow Opening for Predicting Cross-Ventilation Flow Rate

预测交叉通风流量的出流口流量系数实验研究

DOI：
发表时间：
2007
期刊：
Proceedings of Indoor Air Quality, Ventilation and Energy Conservation in Buildings(IAQVEC) 1
影响因子：
0
作者：
Tomonobu Goto;M.Ohba;T.Kurabuchi;T.Endo;Y.Akamine;T.Nonaka
通讯作者：
T.Nonaka

Investigation on applicability of local dynamic similarity model for inflow openings, Prediction accuracy of flow rate of cross-ventilated buildings(Part2)

进风口局部动态相似模型适用性研究、交叉通风建筑流量预测精度（下）