基于多区模型的大空间空调温度场数值模拟

Simulation of temperature distribution in a large space with CFD based on a multizone model

大空间建筑室内空调温度场的数值模拟中,CFD模拟结果的可信度极大地取决于能量方程边界条件的合理设定.探讨了一种基于多区热质平衡模型的边界条件确定方法.在大空间多区热质平衡模型研究基础上,建立了各宏观“大控制体”内的热质平衡方程.模型综合了墙体热传导、壁面对流热交换、壁面之间长波辐射热交换以及内部控制体之间的对流热交换过程.计算得到的壁面温度与热流直接加载到CFD模型的能量方程中,从而实现边界条件的精确化.这种方法是CFD模拟的一种辅助手段.

During the simulation of the temperature distribution in an air-conditioned large space, the reliability of the results depends mostly on the disposition of the boundary conditions of the energy conservation equation. A method based on the study of the multi-zonal model is discussed. The model established mass and energy equilibrium equations for each macro big control volume. Coupled heat transfer of conduction, convection, and radiation was considered in this model. Heat convection between each zone caused by temperature difference and airflow was also included. The calculating results of wall surface temperature and heat flux could be directly treated as the energy boundary conditions in the CFD model, and thus the accuracy of boundary conditions can be derived. This method could be regarded as a necessary auxiliary to CFD simulation.