建筑热模拟动态传热的低阶模型及验证

多维传热特征在现代建筑中极其普遍,但大多数建筑热模拟软件以一维传热模型考虑围护结构传热来简化模型和计算。该文用状态模型的减秩技术得到了三维传热的低阶模型,模型计算效率高,计算准确。比较了不同围护结构的低阶模型和完全模型的频域特性和时域输出结果,表明低阶模型与完全模型有很好的一致性,输出相对误差小于1%。

Low-order heat transfer model and validation for building thermal simulations

The heat transfer characteristics in modern buildings have significant three-dimensional(3-D)characteristics,but one-dimensional models are used in most building codes for thermal analyses to simplify the calculations.State model reduction techniques were used to develop low-order three-dimensional heat transfer model for buildings,which is efficient and accuracy.The method was validated for various envelope designs by comparing the frequency response and time-domain output with complete 3-D models.The predicted results from the low-order model agree well with those of the complete model with relative errors of less than 1%.