大空间建筑下送风分层空调系统区域间换热特性研究

本文采用实验和计算流体力学(CFD)方法,研究了带有柱状下送风系统的大空间建筑中,由气流换热和温差导热组成的对流转移热的计算方法.在缩尺模型实验室中,研究了三种不同排风比的热环境和负荷特性,根据实验得到的中心线垂直温度分布和空调冷负荷验证了CFD模拟结果,并基于相似理论,将缩尺数值模型拓展至全尺寸工况模拟.结果表明:在...

Study on Inter-zonal Heat Transfer for Large Space Buildings with Floor-level Side Wall Air-supply System

This study uses experimental and computational fluid dynamics (CFD) methods to investigate convective heat transfer, heat convection caused by airflow, and heat conduction caused by temperature differences in large-space buildings with floor-level side wall air-supply systems. Three thermal environment experiments with different roof exhaust ratios were conducted in a reduced-scale laboratory to investigate the indoor thermal environment and load characteristics. The CFD simulation results were verified based on the experimentally obtained vertical temperature distribution of the central line and air-conditioning cooling load. Based on similarity theory, reduced-scale numerical models are extended to full-scale configurations. The results show that the heat conduction due to the temperature difference dominates the inter-zonal heat transfer in the floor-level side wall air-supply system. By dividing the entire indoor space into two zones in the vertical direction, the values of inter-zonal heat transfer coefficient Cb for the prototype building are 7.92, 6.14, and 3.81 W/(m2?°C) at 0, 10%, and 20% roof exhaust air ratios respectively. Cb is mainly influenced by the airflow characteristics, zonal division, and airflow pattern, whereas it is less affected by the roof exhaust method.