双层玻璃幕墙的自然采光及照明系统节能研究

自然光通过双层玻璃幕墙后其照度显著下降,透光率仅为10%~20%,在减少空调系统能耗时却影响了自然采光。通过室内自然光的照度测量发现,自然光照度在室内随纵深呈指数形式递减,在晴天和全阴天时距玻璃幕墙较近的位置(玻璃幕墙到1/2纵深)照度值都是高于500 lux的,而在3/4纵深后的工作面照度低于300 lux,室内可以采用部分自然光照明。结合建筑照明平面图,采取优化灯具控制回路开关设置的方法提高自然光利用率时,照明系统能耗将降低50%;采用主动式的采光设计,利用自然光时则照明系统将节能75%以上。

Natural Daylight through Double Glass Curtain Wall and Energy Saving in Lighting System

The illumination of natural light through the double glass curtain wall decreases significantly.Its light transmittance is only 10％～20％,which is benefit for energy saving in air-conditioning system but inverse for natural lighting.It is observed that the illumination in depth decreases in exponential form.It is both higher than 500 lux in the range between double glass curtain wall and 1/2 depth,and changes to a lower value than standard value of 300 lux at about 3/4 depth.Combined with lighting design and measurement,the energy consumption will decrease by 50％,with a switch control of lamps and lanterns and natural daylight utilization.And it will decrease by 75％ when the active lighting design is adopted.