基于RANS和LES的高大空间建筑气流组织仿真和热舒适度评价方法

Air Distribution Simulation and Comfort Evaluation of Large Space Building Based on RANS and LES

针对大空间建筑的暖通空调设计,开展气流组织分析和热舒适评价对于改善室内环境热舒适度和降低能耗具有重要意义。结合基于雷诺时均方程的稳态分析和基于大涡模拟的瞬态分析这2种计算流体力学分析方法的特点,建立了高大空间建筑气流组织仿真方案和热舒适度评价方法。利用稳态分析计算消耗较小的特点,开展多工况热舒适度和空气质量评价;选取典型工况实施计算消耗较大的瞬态分析,获取空气调节全过程,给出室内温度达到设定温度所需要的空调运行时间,从而优化空调运行策略,降低能耗。基于实验结果对2种方法的准确性进行了验证,介绍了所用方法在实际工程项目中的应用,供其他工程参考。

Air distribution simulation and thermal comfort evaluation for heating,ventilation and air conditioning(HVAC)design of large space buildings is of great significance for the human thermal comfort improvement and the energy consumption reduction.By combining the steady analysis based on RANS and the transient analysis of large eddy simulation(LES),an air distribution simulation and thermal comfort evaluation process in large space buildings is established.Due to the low calculation consumption,the steady analysis based on RANS is conducted to efficiently evaluate the thermal comfort and the air quality under multiple working conditions.Considering the high computational consumption of LES,the transient analysis is conducted only under typical working condition.In this way,the entire process of air conditioning and the time required for the indoor temperature to reach the set temperature can be obtained.The process is important for the optimization of air conditioning operation strategy and energy saving.The accuracy of RANS and LES based on experimental results are verified,and the application of the methods used in the practical engineering projects is introduced,which can provide reference for other engineering projects.