夏季遮阳对建筑制冷照明能耗的影响

对3种不同遮阳特性的典型卷帘进行了遮阳系数和光学性能的实验测定.提出制冷照明综合能耗以及综合节能系数,构建了相应的典型房间尺寸和窗墙比,以此就遮阳装置对于制冷和照明能耗的全面影响进行综合研判.结果表明,可见光透过率高,遮阳系数低的卷帘更为节能.当窗墙比分别为0.3和0.5时,与标准玻璃相比,所研究卷帘的节能率达到66%和47%.当窗墙比为0.3,使用荧光灯时,对卷帘的开启度进行控制优化较之没有控制的情况节能5.4%.如采用光效较低的卤钨灯,节能率可达20.7%.基于模拟计算结果,在考虑光热环境的情况下节能的遮阳装置应该具有较高的可见光透过率和太阳能直接反射比.

Impact of Shading on Building Cooling and Lighting Energy Consumption in Summer

The study measures shading coefficient and optical performance of three kinds of rollers, and then it raises combined cooling and lighting energy consumption and combined energy-saving coefficient. The paper uses typical room and window to wall ratios to assess the impact of shading devices on the cooling and lighting energy consumption. The results show that the roller with high visible transmittance and low shading coefficient is more energy-saving. When window to wall ratio separately equals to 0.3 and 0.5, compared to the standard glass the energy-saving rate of the roller reaches 66% and 47% correspondingly. When window to wall ratio is 0.3 and fluorescent lights are used, the control logic of the roller can save 5.4% energy. If halogen tungsten lights are used, the control method even can save 20.7% energy. Based on the results of simulation and calculation, when outdoor daylight and thermal environment is taken to consideration, energy-saving shading devices should have high visible transmittance and solar light reflectance.