基于热成像技术的牛舍围护结构传热阻测试方法  

Evaluation on measure method of heat transfer resistance for enveloped structure of cattle barn based on infrared imaging method

作　　者：曹哲[1,2] 施正香 安欣[1,2] 王朝元 Cao Zhe;Shi Zhengxiang;An Xin;Wang Chaoyuan(College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;Key Laboratory of Agricultural Engineering in Structure and Environment, Ministry of Agriculture, Beijing 100083, China;Beijing Engineering Research Center for Animal Healthy Environment, Beijing 100083, China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]农业部设施农业工程重点试验室,北京100083 [3]北京市畜禽健康养殖环境工程技术研究中心,北京100083

出　　处：《农业工程学报》2017年第24期235-241,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：现代农业(奶牛)产业技术体系(CARS-36);国家863课题任务(2013AA10230602)

摘　　要：针对传统的接触式传热阻测试方法对测试场合要求高、操作复杂、操作时间相对较长等难以应用于环境较为恶劣的畜禽舍问题,该文引入热成像技术,开展了黑龙江地区2种不同类型牛舍的围护结构热特性参数现场测试,获得了基于热成像法和传统接触式测试法下牛舍墙体、屋面、门窗的特征温度值。在此基础上,计算了牛舍围护结构材料的传热阻,并与相应建筑材料的传热阻理论计算值进行了对比分析。结果表明,对于墙体、屋面等围护结构,2种方法所获得的传热阻测试值与理论计算值的偏差小于15%;对于围护结构窗体和门,2种方法所获得的传热阻测试值与理论计算值的偏差在20%~30%之间;虽然热成像法和接触式测试法现场实测值与理论计算值之间都存在偏差,但因现场测试能综合材料老化、脱落、受潮和施工质量等实际情况,相对而言实测值的可信度更高;但综合考虑2种方法,热成像法的操作简单、便捷,可以很好地用于畜禽舍围护结构的热工性能评价。The heat transfer resistance of enveloped building structure plays an important role in the heat gain and heat loss of building environment.It is also a crucial index related to building thermal comfort.Compared with the housing conditions of residents,those conditions of housings for animals are more complex,which are filled with heavy moisture,highly toxic gases,and high-level dust.The accumulation of these factors can have a negative effect on the thermal performance on the surface material of building structure.For minimizing the heat loss of material,it is vital to accurately measure the material heat transfer resistance in the field environment.In recent years,the infrared imaging method,an advanced technology in the area of fault diagnosis and detection,has been widely used in various industries,such as the thermal performance test of enveloped structures on industrial and civil building.It has the distinct advantage on the portable and prompt detection of surface temperatures with the visualized thermal image.This article mainly focuses on the application of infrared thermal image technology in2different forms of cattle barns in northeast region.To determine heat transfer resistance of enveloped structure,the derivation of related heat transfer equation would be taken into account.Compared with the traditional method,the infrared imaging method is more reliable to evaluate the heat transfer resistance of the enveloped structure in the cattle barn.The hand-held infrared thermal imager was used to measure the surface temperature of enveloped structure with setting the view from center passageway towards the wall of the barn.The instrument was carefully calibrated to ensure the setting parameters(emissivity,reflection temperature,humidity,and so on)to be in the optimal conditions before the measurement.For the validation of the infrared image method,the environment temperature was also recorded by the T&RH sensors with6testing points in the north and south sides of the barn.The T thermocouples were installed

关 键 词：墙体 传热阻 热成像仪 接触式测试法 现场测试 

分 类 号：S23[农业科学—农业机械化工程]