遮阳系数在透光面积上设遮阳设备时所吸收和透过的太阳热与无遮阳设备时所吸收和透过的太阳热之比
Shading coefficient The ratio of the solar heat absorbed and transmitted by the shading device to that absorbed and transmitted without the shading device on the transmittance area
以上为机器翻译结果，长、整句建议使用 人工翻译 。