采用CD-8080型双试样导热系数测定仪按GB/T 22476-2008 《中空玻璃稳态U值(传热系数)的计算及测定》中的防护热板法对某结构为6 mm透明普通玻璃+12 mm空气层+6 mm透明普通玻璃的中空玻璃的稳态传热系数进行了测定, 并依据JJF 1059-1999《测量不确定度评定与表示》对试验过程中影响测定结果的各不确定度分量进行了评定。结果表明: 该中空玻璃的稳态传热系数为U=(2.8±0.2) W·m-2·K-1, 包含因子k=2; 其中,由标准板标定, 确定加热单元计量部分平均热流量引入的不确定度为影响中空玻璃稳态传热系数测定结果准确度的主要因素, 由温度测量引入的不确定度其次, 由数值修约引入的不确定度最小。

The steady-state thermal transmittance of a multiple glazing with structure of 6 mm ordinary transparent glass/12 mm air layer/ 6 mm ordinary transparent glass was determinated by guarded hot plate method with CD-8080 type double sample coefficient of thermal conductivity detector according to GB/T 22476-2008 “Calculation and Determination of Steady-state U Values(Thermal Transmittance) of Multiple Glazing”, and the uncertainty of the test results was analyzed and evaluated according to JJF 1059-1999. The results show that the steady-state thermal transmittance of the multiple glazing was U=(2.8±0.2) W·m-2·K-1 and the coverage factor k=2. Uncertainty from the determination average heat flow of the heating measurement unit was the uppermost factor affecting the test results of the steady-state thermal transmittance of the multiple glazing, uncertainty from the temperature measuring was the minor factor, and uncertainty from the rounding off of numberical values was the least factor.