Experimental Study concerning Heat Transfer Characteristic of External Surface of Building

关于建筑外表面的对流换热系数，虽然在墙板的一部分安装了一个小热流板的实验研究已有报道，但很少有研究涉及整个建筑的墙板。本研究重点研究了建筑墙体对流换热系数分布的测量，而不是对流热流密度测量的准确性，并对安装在室外的小型建筑模型(1m×1m×1m)的平板进行了实验，试图根据SAT仪(红外辐射计)的测量结果开发出一种获取对流热流密度的方法，从而开发出一种测量BUI…各部分对流换热系数的方法更重要的是，建筑物墙面上的气流包括1)由建筑物形成并具有建筑物特征的建筑物周围的气流，以及2)由建筑物周围的气流形成并由墙面不规则分布形成的墙面附近的气流。本研究针对提供建筑物周围空气流动的建筑物(1)。当风向相对稳定时，室外建筑物模型周围的空气流动在正负压面上都表现出明显的气流特征，而暴露在阳光下的墙面则呈现出与气流特征相对应的表面温度分布。在本研究中，通过红外辐射计测量的墙体表面的热图像被划分为10 cm×10 cm×10 cm单元，这种方法表明，如果在不规则程度很小的建筑物的墙面上安装两个或多个SAT仪，则可以在较低的测量精度下测量整个墙面的换热系数分布。在本研究中，使用了净交换辐射计的测量值，如果将辐射计的测量值与这些值一起获得，将提高测量精度。较少

Though experimental studies of a small heat flow plate installed to a part of a wall panel have been reported concerning convective heat transfer coefficient of the external surface of the building, few studies have dealt with each entire panel of the building. This is because of difficulty of measurement in the convective heat flow density to the building wall.In this study, major emphasis was put on the measurement of heat transfer coefficient distribution of each entire panel of the building rather than on the accuracy of measurement of the convective heat flow density, and experiments were made to flat surfaces of a small building model (1m×1m×1m) consisting of SAT meter installed outdoors, and attempts were made to develop a method for obtaining the convective heat flow density based on the measurement results of the SAT meter, infrared radiometer ant net exchange radiometer, thereby developing a method for measuring the convective heat transfer coefficient of each part of the bui … More lding.The air flow on the wall surface of a building includes 1)air flow around the building formed by and characteristic to the building, and 2)air flow in the vicinity of the wall surface formed by the air flow around the building and distributed by irregularity of the wall surface. This study aims at the air flow around the building (1)that provides a bace of the air flow around the building.The air flow around an outdoor building model shows a distinctive air flow characteristic on both the positive and negative pressure surfaces if the wind direction is relatively stable, while the wall surface exposed to the sunshine shows surface temperature distribution corresponding to the air flow characteristic.In this study, the thermal image of the wall surface measured by the infrared radiometer was divided into 10cm×10cm×10cm cells, and the heat transfer coefficient was obtained from the heat balance of each surface.This method showed possibility of measurement of heat transfer coefficient distribution of the entire wall surface at a rather low measurement accuracy if two or more SAT meters can be installed on the wall surface of a building having very little irregularity. In the present study, values measured by a net exchange radiometer were used ; if measurement values of a radiometer were obtained together with these values, the measurement accuracy would be improved. Less