【摘要】 为了快速准确地计算建筑围护中热桥传热,提出了等效平板法。将热桥传热分解为室外温、邻室温、室温3种边界输入主导的传热过程,用Fourier方法分析了每种传热过程在边界输入按照正弦波规律变化的物理现象;得到了一维等效平板,并用于计算这几种传热过程的传热量。在动态边界输入条件下通过等效平板传入室内的热流与通过热桥传入室内的热流吻合得很好,且计算速度远高于现有计算方法,可方便地集成到常规建筑能耗模拟程序中。更多还原

【Abstract】 An equivalent slabs approach was developed to accurately and quickly compute thermal bridges in building structures.The heat transfer across the thermal bridges was decomposed into several heat transfer processes controlled by various kinds of boundary conditions.The physical phenomenon for each of the heat transfer processes with harmonic boundary condition was analyzed using Fourier Theory to define an equivalent slab for each process.The heat fluxes from the equivalent slabs to the rooms for unsteady boundary conditions were validated by finite difference calculations.The computational time of the thermal bridges method is much less than for existing methods.The results can be easily implemented into building energy software simulation packages.更多还原