热源面积对室内热压自然通风的影响

针对具有内热源的民用建筑,采用计算流体力学(CFD)方法,通过改变热源面积对热压自然通风流场进行数值模拟分析,得出了不同热源面积下的通风量、排风温度及其变化规律,分析了不同工况下的温度场和速度场,得出了中和面高度和有效热量系数随热源面积的变化规律。结果表明:热源面积的变化主要影响房间下部的温度场,对通风量和排风温度的影响不大,对中和面高度和有效热量系数均有一定的影响。该结论为民用建筑自然通风系统的设计提供了理论依据。

Influence of Heating Source Area on Thermal Pressure Natural Ventilation in Room

Aimed at the civil building with inside heating source,using the method of computational fluid dynamics(CFD),changing the heating source area,and simulating the fluid field of the thermal pressure natural ventilation,authors presented the quantity of air ventilation,the temperature of air flowing out and its changing rule in different heating source area;analysed the temperature field and velocity field in different conditions;gave the variation rule of the height of neutral surface and the effective heating coefficient.The result shows that the variations of heating source area mainly influence the temperature field of bottom area in room,and influence the quantity of air ventilation and the temperature of air flowing out in some sort,and produce some influence on the height of neutral surface and the effective heating coefficient to a certain extent.All these conclusions provide theory foundation for the design of the natural ventilation system in civil building.