考虑辐射换热的建筑结构温度场的数值模拟

借助于通用有限元软件ABAQUS对典型的建筑结构屋面和墙体在周围环境温度、太阳辐射及非线性辐射交换等周期性变化的边界条件下的温度场进行了数值模拟.模拟结果表明:与有限体元法(FVM)相比,采用有限单元法(FEM)也能得到可靠的温度参数;非线性辐射换热相比于表面对流换热来说不能忽略;保温层的铺设对混凝土板的温度分布有重要影响.

Numerical simulation of temperature field of building structures considering radiation

General finite element method(FEM) software ABAQUS was applied to simulate the temperature field of typical building roof and wall elements subject to periodic changes in ambient temperature, solar radiation and nonlinear radiation exchange. A numerical model based on the finite element method was applied for comparison with the finite volume method(FVM) and for calculating the hourly temperature distribution in typical building roof and wall elements. The results show that (i) compared with using FVM, using FEM can also get credible temperature parameters; (ii) regarding the heat convection on the outside surface, the nonlinear radiation exchange cannot be ignored; (iii) insulation layer has important effect on the hourly temperature distribution in the concrete slab.