Experimental Study concerning Convective Heat Transfer Characteristics of Indoor Wall Joints

传统的室内墙体传热系数的研究局限于局部或墙体平均传热系数，而对室内墙体接缝处传热系数的测量研究项目很少，本研究旨在建立墙体表面传热系数分布的测量方法，用红外辐射温度计测量了连接在铝合金上的氯丁橡胶模型结构的壁面温度，采用红外辐射测温仪对氯丁橡胶模型水箱进行了测量，根据氯丁橡胶模型结构前、后表面的温差和导热系数，求出了水箱的对流热流密度。本文讨论了测量方法， 关于我们 用红外辐射温度计测量了对流换热系数，并对等温和非等温界面（两壁、天花板和地板;天花板高度为2 m）在冷却过程中的对流换热系数进行了实验和讨论.介绍了用红外辐射测温仪测量传热系数的方法，并与热电偶局部测量法进行了比较，该方法根据表面温度分布确定传热系数分布。因此，对于表面温度分布变化较大的表面，如房间板的接缝，这是一种有效的方法.等温表面连接处的传热特性（1）两壁面连接处的传热系数随测量位置的靠近而减小，随测量位置的增大而增大。(2)天花板与墙侧墙连接处的传热系数随着测量位置离连接处和天花板转角的距离的增加而减小。(3)顶棚与墙连接处的传热系数在顶棚侧大于顶棚中心，且随着测量位置的靠近拐角处而增大。(4)另一方面，地板与两个墙面的接缝以及地板与墙壁的接缝的传热系数在地板侧和墙壁侧几乎是恒定的，与距接缝的距离没有任何关系。3.非等温壁面连接处的传热系数（1）与壁面中心相比，壁面连接处和拐角处的传热系数较小。(2)表面连接处和拐角处的传热系数分布随冷热表面的组合而变化。少

Research as to the conventional indoor wall heat transfer coefficient is restricted to the local or wall average heat transfer coefficient, and such research programs on the measurement of the heat transfer coefficient for indoor wall joints are very few.The purpose of this study is to develop the measurement method for heat transfer coefficient distribution on a wall surface, using a infrared radiation thermometer in order to clarify the heat transfer coefficient characteristics on the wall joints using the measuring method thus developed.The measurement method is characterized in that the surface temperature on the wall of a neoprene model structure attached to an aluminum thermostatic water tank is measured with a infrared radiation thermometer in order to find the convective heat flux density according to the difference between the front and rear surface temperatures on that wall of the neoprene model structure and heat conductance. This paper discusses the measuring method of the … More heat transfer coefficient using a infrared radiation thermometer, and describes the results of an experiment and discussion concerning the convective heat transfer coefficient of joints consisting of isothermal and non-isothermal surfaces (two walls, ceiling and floor ; ceiling height 2m) during cooling.1. Development of heat transfer coefficient measuring method using a infrared radiation thermometer in comparison with the local measuring method using thermocouples, this measuring method determines the heat transfer coefficient distribution based on the surface temperature distirution. Therefore, it is an effective method for surfaces with varying surface temperature distribution, such as the joints of room panels.2. Heat transfer characteristics of joints of isothermal surface(1) The heat transfer coefficient of the joint of two wall surfaces decreases as the measuring position gets closer to the joint and higher.(2) The heat transfer coefficient of the joint of the ceilong and a wall on the wall side decreases as the measuring position gets closer to the joint and ceiling corner.(3) The heat transfer coefficient of the joint of the ceilong and a wall on the ceiling side is larger than that of the ceiling center, and it increases as the measuring position gets closer to the corner.(4) On the other hand, the heat transfer coefficient of the joint of the floor and two wall surfaces and that of the joint of the floor and a wall are almost constant and without any relationship to the distance from the joint, on both the floor and wall sides.3. Heat transfer coefficient of joint of non-isothermal wall surfaces(1) The heat transfer coefficient of the joint of surfaces and that of the corner are smaller, compared with the center of the wall.(2) The distribution of the heat transfer coefficient of the joint of surfaces and that of the corner vary according to the combination of cool and hot surfaces. Less