置换通风中风速对地板辐射供冷影响的仿真与试验研究

Simulation and Experiment on Influence of Wind Velocity on Floor Radiant Cooling in Displacement Ventilation

针对置换通风与地板辐射联合供冷方式存在供冷能力不足的问题,重点分析了风速对房间温度场和换热的影响,利用FLUENT软件对置换通风与地板辐射联合供冷方式中置换通风等进行了研究,得到不同风速下房间温度场的变化规律,并从换热角度分析风速对地板辐射供冷能力的影响;建立了置换通风与地板辐射联合供冷试验装置并进行相关试验,验证了置换通风中在不同出风速度下房间温度梯度的变化规律。结果表明:置换通风中风速的增加不仅可提高地板辐射供冷能力,同时还使房间温度场分布更加均匀且舒适性提高。研究可为置换通风与地板辐射供冷方式在大空调负荷建筑的应用提供指导。

The influence of wind velocity on indoor temperature distribution and heat transfer in displacement ventilation was analyzed with FLUENT and the temperature profiles were obtained at different wind velocity. The influence of wind velocity on floor radiant cooling capacity was discussed. A test rig of combined cooling of displacement ventilation and floor radiation was set up and experiments were conducted to confirm indoor temperature gradient profiles at different wind velocity in displacement ventilation. The results show that the increase of velocity could not only raise the capacity of the floor radiant cooling but also improve distribution uniformity of the temperature field and thermal comfort.