基于平面热源-热流计法确定墙体热阻的影响因素分析  

ANALYSIS OF INFLUENCING FACTORS OF WALL THERMAL RESISTANCE BASED ON PLANE HEAT SOURCE-HEAT FLOW METER METHOD

作　　者：王雷[1] 王莹莹[1] WANG Lei;WANG Ying-ying(Xi'an University of Architecture and Technology,School of Building Services Science and Engineering,710055,Xi'an,China)

机构地区：[1]西安建筑科技大学建筑设备科学与工程学院,西安710055

出　　处：《建筑技术》2024年第17期2080-2085,共6页Architecture Technology

基　　金：国家自然科学基金项目(52322801);陕西省杰出青年科学基金项目(2022JC-22)。

摘　　要：通过试验验证了平面热源-热流计法测试墙体热阻的可行性,并利用ANSYS软件建立墙体二维传热模型,通过模拟计算研究了平面热源加热面积、墙体两侧温差、测点布置和双面加热对墙体热阻值的影响。研究结果表明:墙体冷热侧温差越大,达到稳定传热时间越长,导致热阻值误差更大,建议墙体两侧温差在20℃时进行热阻测试;加热面积从0.3 m×0.3 m增大到1.2 m×1.2 m,使得一维传热区大小从0.11 m增加到0.27 m,热阻值误差降低至0.5%;测试测点应布置在靠近水泥砂浆层的区域;双面加热测试热阻值误差比单面加热低2%。In this paper,the feasibility of the plane heat source-heat flow meter method to test the thermal resistance of the wall is verified by experiments,and the two-dimensional heat transfer model of the wall is established by ANSYS.The influence of the heating area of the plane heat source,the temperature difference on both sides of the wall,the arrangement of the measuring points and the double-sided heating on the thermal resistance of the wall is studied by simulation calculation.The results show that the larger the temperature difference between the cold and hot sides of the wall is,the longer the stable heat transfer time is,and the larger the thermal resistance error is.It is suggested that the thermal resistance test should be carried out when the temperature difference between the two sides of the wall is 20°C.The heating area increases from 0.3 m×0.3 m to 1.2 m×1.2 m,which makes the size of one-dimensional heat transfer zone increase from 0.11 m to 0.27 m,and the error of thermal resistance value decreases to 0.5%.The test points should be arranged in the area near the cement mortar layer.The thermal resistance error of double-sided heating test is 2%lower than that of singlesided heating.

关 键 词：墙体热阻 平面热源-热流计法 影响因素 

分 类 号：TU111[建筑科学—建筑理论]