关于单元表面吸收率的系统温度误差计算

Computation of System Temperature Error about Unite Surface Absorptivity

利用系统灵敏度理论和系统误差统计理论,通过引入辐射传递系数和角系数间的关系,针对漫发射、漫反射热系统,提出了关于单元表面吸收率的系统温度误差计算方法。以立方体内表面间的辐射换热为例,采用该计算方法对系统温度误差进行了计算。通过分析比较表明:采用该方法得到系统温度灵敏度具有较高计算精度,系统统计温度误差受实验次数影响,并且在均方差较小的情况下,系统统计温度误差之比等于系统温度灵敏度之比的绝对值。

Based on system sensitivity theory the relation between radiation transfer coefficient computes system temperature error about unite and system error analysis theory, by introducing and angle factor, a computational method, which surface＇s absorptivity is developed. Taking the example of radiation transfer among surfaces inside a cubic , system temperature error is computed by the computional method. It shows that system temperature sensitivity has higher precision, and experimental time influences on system statistical temperature error. If standard deviation is smaller, ratio of system statistical temperature error is equal to ratio of system temperature sensitivity.