电致变色玻璃窗在北京某办公楼节能改造中的设计方案优化研究

Design Optimization of Electrochromic Windows in Energy-saving Renovation of an Office Building in Beijing

本文以北京某办公楼南向外窗改造为研究案例,以市场销售的电致变色(EC)玻璃窗为研究对象,探讨EC玻璃窗的节能设计方案。根据不同中空层数、不同中空层厚度与有无Low-E膜,设计了12种EC玻璃窗,使用Window 7.6计算玻璃窗热工参数,基于Energy Plus建立建筑仿真模型,通过模拟评估不同EC玻璃窗的节能效果,分析EC玻璃窗设计方案对建筑能耗影响规律。研究结果表明,EC玻璃窗适度增加中空层厚度,提高保温性能有利于减少建筑能耗;增加Low-E膜与中空层数未显示节能效果,主要由于EC玻璃本身具有低辐射性能,同时附加Low-E膜使得玻璃窗透过率进一步降低;增加中空层数降低了EC玻璃窗的太阳得热系数与可见光透过率。EC玻璃窗的最佳设计方案为7 mm EC玻璃+12A+6 mm白玻,相比于普通双玻中空玻璃窗全年建筑能耗节约11.08%。本文研究可为EC玻璃窗的节能应用提供参考。

This paper took the renovation of the south-facing window of an office building in Beijing as a research case,and took the electrochromic(EC)window in the market as the research object to explore the energy-saving design scheme of EC window.According to the different air layers,thicknesses of air layer and the presence of Low-E film,12 kinds of EC glass were designed.WINDOW 7.6 was used to calculate the thermal parameters of the glazing.A building model was established based on EnergyPlus to analyze the influencing laws of EC glass design schemes on building’s energy consumption by evaluating the energy saving performance of different EC glasses.The results show that increasing the thickness of the air layer and improving the thermal insulation performance of EC glass can reduce the building’s energy consumption.Increasing the number of Low-E film and air layer had no effect on energy consumption,which was mainly because EC glazing had Low radiation performance,while Low-E film further reduced the transmittance of glass.Increasing the number of air layer reduced the solar heat gain coefficient and visible light transmittance of EC glass.The best design scheme of EC window is 7 mm EC glass+12 A+6 mm white glass,which can reduce the energy consumption by 11.08%compared with double layer glass.This study can provide a reference for the energy saving application of EC glass.