STUDY ON HEAT TRANSFER MECHANISM OF INSIDE BLIND WINDOWS

在一个实际尺寸的试验室的窗户上安装了一个内百叶窗，并对其心脏传递机制进行了研究。试验室安装在一个转台上，其形状为2.2m × 2.2m × 2.2m的立方体。试验室有1m × 1m的窗户和5mm厚的玻璃，侧壁和屋顶有丙烯酸树脂开口用于观察。转台是电机驱动的，窗户可以通过手动操作朝向太阳。百叶窗周围气流的可视化证实了室内空气通过百叶窗下部的板条进入玻璃与百叶窗之间的空气空间，并通过百叶窗上部的状态排出的现象。这种空气运动的驱动力是由板条处的太阳热量增加引起的室内空气和空气空间之间的温差造成的烟囱效应。同时进行了垂直温度和风速分布测量实验，并记录了气象数据。利用这些数据进行了盲板气流系数的实验计算。采用辐射传热吸收因子和通风双垂直区模型，对内盲窗的传热机理进行了形式化描述，并对实验结果进行了验证。考虑收缩流动和板条间速度分布的模型与实验结果一致。对不同条件下的太阳热增益和遮阳因子进行了计算和检验，以验证该模型的准确性。

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.