Experimental Study concerning Convective Heat Transfer Characteristics of Indoor Wall Joints

室内墙体接缝对流换热特性试验研究

• 批准号: 07650696
• 负责人: KOBAYASHI Sadanori
• 金额: $ 1.41万
• 依托单位: Shimane University (1996)Fukuyama University (1995)
• 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
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650696/
• 关键词: convective heat transfer coefficient; wall joint; indoor; measuring method; infrared radiation thermometer; 赤外線放射温度計

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

传统的室内墙体换热系数研究局限于局部或墙体平均换热系数，对室内墙体接缝换热系数测量的研究方案很少。本研究的目的是建立一种利用红外辐射测温仪测量墙体表面传热系数分布的方法，以便利用所开发的测量方法明确墙体接缝处的传热系数特性。该测量方法的特点是，利用红外辐射测温仪测量附着在铝制恒温水箱上的氯丁橡胶模型结构的壁面温度，根据该模型结构的前后壁面温度和导热系数的差值，求出对流热流密度。本文讨论了用红外辐射测温仪测量传热系数的方法，并对等温面和非等温面（两墙、顶板和地板，顶板高度2m）组成的接头在冷却过程中的对流换热系数进行了实验和讨论。开发了利用红外辐射温度计测量传热系数的方法，并与热电偶局部测量方法进行了比较，该测量方法根据表面温度分布确定传热系数的分布。因此，它是一种有效的方法，表面温度分布变化的表面，如房间面板的接缝。(1)两壁面结合部的换热系数随测量位置越靠近结合部越高而减小。(2)吸顶板与壁面接头处的换热系数随着测量位置越靠近接头处和吸顶板转角而减小。(3)顶棚与顶棚一侧墙体结合处的换热系数大于顶棚中心的换热系数，且随测量位置靠近角落而增大。(4)另一方面，地板与两个墙面的接头处和地板与墙面的接头处的换热系数几乎是恒定的，与距离接头处的距离没有任何关系，无论是地板还是墙面。非等温壁面结合部的换热系数(1)壁面结合部的换热系数和边角处的换热系数比壁面中心的换热系数小。(2)表面结合处和转角的换热系数分布随冷热面组合的不同而不同。少

项目成果

Sadanori KOBAYASHI,Fumio HAGIWARA: "Convective Heat Transfer Coefficient of Indoor Wall Joints Part 4. (Surface temperature, air temperature and conductive heat flux density characteristics of the joint of non-isothermal wall surfaces)" Summaries of Techn

小林贞德、萩原文雄：《室内墙体接缝的对流传热系数第4部分。（非等温墙体表面接缝的表面温度、空气温度和传导热流密度特性）》技术摘要

小林定教、萩原文雄: "放射温度計による壁取合い部分の熱伝達率測定法" 第33回日本伝熱シンポジウム講演論文集. 429-430 (1996)

Sadanori Kobayashi、Fumio Hagiwara：“使用辐射温度计测量墙体接缝处的传热系数”第 33 届日本传热研讨会论文集 429-430 (1996)。

小林定教、萩原文雄: "室内各面取合い部分の対流熱伝達率に関する実験的研究 その5、非等温面取合いの対流熱流密度、熱伝達特性" 日本建築学会中国支部研究報告集. 20. 289-292 (1997)

小林定则、萩原文雄：《室内各倒角的对流换热系数第5部分、非等温倒角的对流热流密度及换热特性》日本建筑学会中国分会研究报告20。289 -292。 (1997)

Sadanori KOBAYASHI,Fumio HAGIWARA: "Convective Heat Transfer Coefficient Measurement Method for Indoor Wall Joints Using a Radiant Energy Thermometer" Memoirs of The Faculty of Science and Engineering, Shimane University. vol.30. 129-145 (1997)

小林贞德、萩原文雄：《使用辐射能温度计的室内墙体接缝的对流传热系数测量方法》岛根大学理工学院回忆录。

Sadanori KOBAYASHI,Fumio HAGIWARA: "Convective Heat Transfer Coefficient of Indoor Wall Joints Part 5. (Convective heat flux density and heat transfer characteristics of the joint of non-isothermal wall surfaces)" Summaries of Technical Paper of Annual Me

小林定则、萩原文雄：《室内墙体接缝的对流传热系数第5部分（非等温墙面接缝的对流热流密度和传热特性）》年会技术论文摘要