建立电致变色窗建筑采光和能耗模型,采用新采光指标,以综合性能为目标,对电致变色窗在夏热冬冷地区长沙的档位透过率开展优化研究。结果表明：在长沙地区,电致变色窗4个档位的透过率在过渡季和采暖季分别设置为51.40%、18.80%、4.80%和1.00%时综合性能最佳,有效日光照度分别为75.80%和50.91%,单位面积能耗分别为6.70和11.88 kWh/m2。而在制冷季,档位的透过率设置为51.40%、32.60%、23.60%和14.10%时综合性能最佳,有效日光照度为92.28%,单位面积能耗为8.30 kWh/m2。通过以上档位透过率的设置,与普通双层Low-E玻璃相比,电致变色窗的全年有效日光照度增加40.78%,全年不可感知眩光的时长百分比增加59.75%。由于普通双层Low-E 玻璃节能性能较好,且电致变色窗明暗档位太阳得热系数差值较小,年度单位面积总能耗仅减少4.14%。
Abstract
In this study, daylighting and energy consumption models were established for an office building equipped with electrochromic windows. Two new daylighting indices were introduced. With the above model and indices, the study of transmittonce optimization was carried out in Changsha, a region characterized by hot summers and cold winters. The results indicate that during the transitional and heating seasons, the optimal transmittance settings for the four stalls of electrochromic windows are 51.40%, 18.80%, 4.80%, and 1.00% in Changsha, respectirdy. It can achieve the best comprehensive performance with useful daylight illuminance of 75.80% and 50.91%, and energy consumption of 6.70 kWh/m2 and 11.88 kWh/m2 in the transitional and heating seasons respectively. In the cooling season, the optimal transmittance settings are 51.40%, 32.60%, 23.60%, and 14.10%,respectirely, resulting in a useful daylight illuminance of 92.28% and energy consumption of 8.30 kWh/m2. By adopting the above strategy, the annual useful daylight illuminance increased by 40.78%, and the annual percentage of imperceptible glare increases by 59.75%,compared with ordinary double-layer Low-E glass. Due to the good energy-saving performance of ordinary double-layer Low-E windows and the small difference in solar heat gain coefficient between the light and dark state of electrochromic windows, the annual total energy consumption per unit area is only reduced by 4.14% with electrochromic windows.
关键词
办公建筑 /
节能 /
采光 /
电致变色窗 /
综合性能
Key words
office buildings /
energy efficiency /
daylighting /
electrochromic windows /
comprehensive performance
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基金
国家重点研发计划（2023YFC3806205-3）
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