遮阳翻板对厦门市建筑物太阳辐射得热的影响

The Effect of Shading Louvers on the Solar Radiation Heat Gain of Buildings in Xiamen

利用翻板辐射传输计算模型和得热逐时计算模型,研究遮阳翻板对厦门市建筑物窗口及外墙得热的影响。结果表明:相对于无遮阳情形,梭形翻板和穿孔弧形翻板的隔热作用非常明显,其中梭形翻板又比穿孔弧形翻板效果更好;遮阳翻板有效降低了墙体和窗口的峰值得热量,降低的幅度随翻板倾角的增大而增大;但是,由于遮阳板的存在,使得建筑围护结构在夜间的散热能力降低;翻板表面反射率越大,进入窗口的太阳辐射得热量就越大。最后提出:从夏季遮阳节能角度出发,厦门夏季百叶倾角应尽可能大,以阻挡太阳辐射带来的得热,冬季应调整翻板倾角,使得翻板尽量面对太阳直射方向,尽可能使得太阳辐射进入室内。

Based on the radiation calculation model and hourly heat transfer calculating model,effects of shading louvers are studied on buildings in Xiamen,and results show that,compared with no shading,shading effect of shuttle louvers and perforated louvers are obvious,especially the shuttle louvers; shading louvers can effectively reduce the peak heat gain of wall and window,and the effect increases in the rotation angle; however,shading louvers can reduce the cooling capacity of the building envelope at night.The greater the reflectivity of the surface of the plate,the greater the solar heat gain of window,which is more obvious when the rotation angle of the louvers is smaller,however the difference is very small when the rotation angle is larger.Finally,shading strategy for buildings in Xiamen is brought up.In the summer,the rotation angle should be as large as possible to prevent the solar heat gain.In the winter,rotation angle should be adjusted to face the direction of the sun as far as possible to let more solar radiation into the room.