新型屋顶式太阳能烟囱通风性能的模拟研究  

Numerical Investigation on Ventilation Performance of a New Roof Solar Chimney

作　　者：顾元[1] 雷勇刚[1] 王飞[1] 

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024

出　　处：《热能动力工程》2016年第6期98-104,127,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51106103);太原理工大学校团队基金资助项目(2013T051)

摘　　要：介绍了一种基于风压和热压耦合作用下的新型屋顶式太阳能烟囱,通过三维数值模拟,研究百叶窗安装高度与烟囱高度比值h_4/h_1、挡风板高度与百叶窗高度比值h_2/h_3、通道Ⅱ宽度与通道Ⅰ宽度比值w_2/w_1、室外风速v和太阳辐射强度I对其通风性能的影响。结果表明:该新型屋顶式太阳能烟囱通风量随h_4/h_1值的增加先增后减,在h_4/h_1=0.15附近通风量达到最大,而烟囱出口截面速度随着h_4/h_1值的增加而减小;随着w_2/w_1值的增加,不同室外风速下的通风量变化趋势不同。A new roof solar chimney based on the coupling action of wind pressure and thermal pressure was introduced.The effects of the ratio of the shutters installation height to the solar chimney height( h_4/ h_1),the ratio of the windshield height to the shutters height( h_2/ h_3),the ratio of the channel Ⅱwidth to the channel Ⅰwidth( w_2/ w_1),outdoor wind speed( v) and solar radiation intensity( I) on the ventilation performance of the new structure were studied by three-dimensional computational fluid dynamics method.The results show that the mass flow rate of the new roof solar chimney firstly increases,and then decreases with the increase of the ratio( h_4/ h_1).There is an optimum ratio( h_4/ h_1) at around 0.15 for the maximum of mass flow rate,but the velocity across the chimney outlet decrease with the increase of the ratio( h_4/ h_1).With the increase of the ratio( w_2/ w_1),the mass flow rates of the solar chimney under different outdoor wind speeds have different variation trends.

关 键 词：屋顶式太阳能烟囱 风压 热压 通风性能 

分 类 号：TU834.1[建筑科学—供热、供燃气、通风及空调工程]