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

现场实验，风洞实验和图像分析已经进行。研究结果可以概括如下。（1）局部动态相似性模型可以预测放电系数，如果满足某些要求，它们会随风向和开放位置而变化。在本研究中进行了四种类型的风洞实验，以调查当将模型应用于流入时必须如何严格满足这些要求，当切向流的方向或剖面发生变化或开口附近有壁时，应用模型没有实质性问题。（2）与Comis网络模型相吻合。对于单区和两区建筑模型，验证了通风流速的预测准确性。与常规孔流量模型相比，获得的排放系数和通风流量的预测更好。（3）在2006年夏季，通过超声波仪的超声波仪来测量的气流特征。（4）当空气速度大于0.5m/s时，各种空气速度的变化和空间的空气流动波动在交叉换气下的空气和空气波动在空调系统中的空气调节系统中的空气速度上的影响，在交叉换气下的空气流动在空气调节系统中的影响更高。通风案件并在空调案件下。为了阐明表面温度波动的频率，提出了一种将红外动画传递到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很小，而不是在屋顶上而不是在墙壁上。发现屋顶窗是增加通风流速的非常有效的工具，尤其是在人口稠密的区域。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）

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

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