自辨识方法优化建筑墙体动态热特性模型的分析讨论

Analysis of Optimizing the Structure of the Dynamic Thermal Mode for Building Wall by Auto-identification Method

当使用系统辨识方法建立建筑墙体动态热特性模型时,通常将时间离散模型的阶次通常设为定值。但实际情况是墙体模型阶次不仅与墙体本身特性有关,而且还受到墙体所在位置和测量环境的影响。因此,阶次为定值时,计算的结果精度往往较差。使用自辨识模型阶次的方法来确定墙体模型阶次。计算结果表明:建筑墙体动态热特性模型的模型阶次不是固定的,使用自辨识模型阶次的方法能够提高结果的精度。

When using the system identification methods to establish the dynamic thermal model of the building wall, the order of the discrete time model was usually set up to be constant value. But the reality is that the order of the wall model, which is impacted not only by the characteristics of the wall itself, but also by the location of the wall and measuring environment. Therefore, when the order is the constant value, the accuracy of calculative result is sometime poor. The method of the auto-identification model was used to ascertain the order of the wall model. The result shows that the order of the dynamic thermal model of the building wall is not fixed. And if auto-identification model is used to calculate, the accuracy of result will be improved.