【作者】 乐文璞； 陈颖； 莫松平； 郭文仙；

【Author】 Le wenpu;Chen Ying;Mo songping;Guo wenxian;Guangdong University of Technology;

【机构】 广东工业大学；

【摘要】 利用Fluent软件建立了双侧开口的大热源建筑自然通风数值模型,对大气透过率(Sunshine Fraction)分别为0、0.55、0.75和0.91时的室内外流场进行了计算,得到了日照作用对自然通风量、通风口温度、室内气流速度场和温度场分布的影响。计算结果表明:在自然通风条件下,日照强度增大,会使通风口温度升高,同时也可以带来通风量的提升,利于室内气流的对流和扩散,使气流速度分布更均匀。根据温度分布特征的不同,可以将热源与屋面之间的区域分为三个区:Ⅰ区同时发生进入新风的惯性流动和热源附近的热致流动,温度波动幅度大;Ⅱ区主要发生气流的混合,日照的增强可使这一区域的温度和速度分布都更加均匀;Ⅲ区主要发生壁面温度升高驱动下的热致流动,随着日照强度增大,屋面温度升高,该区域气流垂直方向上的温度梯度增大。更多还原

【Abstract】 Numerical model of natural ventilation in large heat-inside buildings including vents on both sides was built with CFD code.Both the internal flow and the external flow were calculated when the Sunshine Fraction(SF)is 0,0.55,0.75,0.91.All the effects of solar radiation on the natural ventilation air flow rate,the average vent temperature,the internal velocity and temperature distribution were analysed.It’s found that:as SF increases,the vent temperature increases as well as the air flow rate increases.And SF increase can engage the air convection and diffusion,which results in more uniform indoor velocity distribution.Depending on the different character of vertical temperature distribution,the area between the heat source and the roof can be divided into 3 zones.The inertial flow and the thermal diffusion flow occurs at the same time which results in a larger temperature fluctuation.The mixing of air flow in different temperature and velocity occurs in the second zone.The increase of SF results in more uniform flow distribution.Flow in the third zone was totally influenced by the roof temperature.as SF increases,the roof temperature increases which leads to a larger vertical temperature gradient.更多还原