The air supply terminal located at the floor level attached to side-wall is widely used in large space buildings, leading to potential energy saving as well as significant vertical thermal stratification. The cooling load calculation of such system is challenging, especially the calculation of the load gained from unoccupied zone. This paper adopts experiment and computational fluid dynamics (CFD) methods to study the heat transfer upward and downward across the stratified surface in large space building with floor-level side wall air-supply system. Five experimental cases with different heat source power and exhaust airflow ratios are performed to study their effects on the indoor thermal environment. We investigate the same cases in CFD and verify the result of vertical temperature distribution and cooling load components. As a critical parameter in evaluating the thermal stratification environment of large space building, the inter-zonal heat transfer coefficient C_b is emphatically discussed. By comparing the C_b value obtained through the two methods, the accuracy of the microscopic method is verified by the heat balance method. The results show that the Cb value is mainly affected by the zonal division and air distribution, but less prominently by exhaust airflow ratio and heat source in the occupied zone.

位于与侧壁相连的地板水平上的供气终端广泛用于大型空间建筑，这不仅可以节省能源，而且还可以显着提高垂直热分层。这种系统的冷却负荷的计算是有挑战性的，尤其是从无人区获得的负荷的计算。本文采用实验和计算流体动力学（CFD）方法研究了带有地板水平侧墙供气系统的大空间建筑中分层表面上的热传递。进行了五个具有不同热源功率和排气流量比的实验案例，以研究它们对室内热环境的影响。我们研究了CFD中的相同情况，并验证了垂直温度分布和冷却负荷分量的结果。着重讨论了C _b。通过比较通过两种方法获得的C _b值，通过热平衡方法验证了微观方法的准确性。结果表明，Cb值主要受区域划分和空气分布的影响，而受占空区的排气流量比和热源影响较小。