建筑围护结构传热性能现场检测的误差分析

建筑外墙传热性能现场检测是建筑节能检验的重点与难点,目前的检测方法难以得出较为准确的结果。针对以上问题,提出了采用热箱加热流计的检测方法以及该方法的误差评价方法,并运用计算机模拟的手段分析了热箱尺寸、温度制度、墙体构造、墙体厚度对该方法检测结果误差的影响,指出影响误差的主要因素是热箱尺寸和墙体厚度。根据模拟试验结果进行了现场检测试验,证明热箱加热流计的检测结果有良好的精度。

Error Analysis for In-situ Measurement of Heat-transfer Coefficient of Building Envelope

The in-situ measurement of heat-transfer coefficient of external wall is the major content of building energy efficient measurement.A new test method and error assessment function were put forward.Computer simulation was conducted to analysis the influence of hot-box size,air temperature in hot box,structure and thickness of external wall on the result error to provide the theoretical guidance for test apparatus development.The results show that,size of hot-box and thickness of external wall is the major factors which decide the error in test.In-situ measurements were conducted according to the computer simulation results and show fine accuracy.