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STUDY ON HEAT TRANSFER MECHANISM OF INSIDE BLIND WINDOWS

内盲窗传热机理研究

基本信息

批准号：
07650691
负责人：
HAYASHI Tetsuo
金额：
$ 1.34万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

An inside blind was attached on the window of a real-size test room and its heart transfer mechanism was investigated. The test room was installed on a turn table and its shape was cubic of 2.2m by 2.2m by 2.2m. The test room has the window of 1m by 1m and 5mm thick glazing and openings of acrylic resin for observation on a side wall and the roof. The turn table was motor-drive and the windows can be faced to the sun by mannual operation.Visualization of air flow around the blind verified the phenomenon indoor air induced through slats of lower part of the blind to the air-space between the glazing and the blind and the air went out through the stats of upper part of the blinds. The driving force of this air movement is stack effect resulting from the temperature difference between the indoor air and the air space caused by the solar heat gain at the slats. Experiments to measure vertical temperature and air velocity distribution was conducted and the weather data was recorded at the same time. Air flow coefficients of blind slats are obtained experimentally with these data.Heat transfer mechanism of inside blind windows was formulalized using absorption factors for radiative heat transfer and two vertical zone model for ventilation and verified with experimental results. The model of considering a contraction flow and a velocity distribution between slats was accorded with the experimental results. Solar heat gains and solar shading factors on various conditions were calculated and scrutinized to verify the accuracy of this proposed model.

在一个真实大小的试验室窗户上安装了一个内部百叶窗，并对其心脏传递机理进行了研究。测试室安装在转台上，其形状为2.2m×2.2m×2.2m的立方体。测试室有1米乘1米和5毫米厚的玻璃窗，侧壁和屋顶上有用于观察的丙烯酸树脂开口。通过对百叶窗周围空气流动的可视化观察，验证了室内空气通过百叶窗下部板条进入窗帘与百叶窗之间的空隙，通过百叶窗上部的统计信息排出的现象。这种空气运动的驱动力是室内空气和空气空间之间的温差引起的堆叠效应，这是由于板条上的太阳热得热造成的。进行了测量垂直温度和风速分布的实验，同时记录了气象数据。利用辐射换热的吸收系数和通风的双垂直区模型建立了百叶窗内窗的换热机理公式，并与实验结果进行了验证。考虑收缩流和板条间速度分布的模型与实验结果吻合较好。为了验证该模型的准确性，对不同条件下的太阳热增益和太阳遮阳系数进行了计算和分析。