VO<sub>2</sub>-based thermochromic smart window: From energy savings to generation

图 1 (网络版彩色)(a) 相变前后VO 2 薄膜透过率曲线; (b) VO 2 智能 膜节能机理: VO 2 薄膜在红外光区随着温度变化透过率不同, 高温相 阻隔红外, 低温透过红外.(a)中阴影部分为AM1.5条件下的太阳辐射 能光谱(ASTM G173-03) Figure 1 (Color online) Typical transmittance spectra of a VO 2 film at below and above phase transition temperature (a) and the mechanism of VO 2 -based thermochromic window (TCW) (b): VO 2 film shows different transmittance in near infrared waveband.Infrared waveband is the source of solar heat, thus, the solar heat entering room can be regulated by responding to temperature change.Shadow in (a) is the solar irradiance spectrum for air mass (AM) 1.5 (ASTM G173-03) 利用这一光学特性, 该智能窗可以根据环境温度自 动调节太阳能摄入量, 在外界气温高时, VO 2 智能窗 阻挡太阳能量进入室内, 减少制冷所需的能耗; 在外 界气温较低时, VO 2 智能窗又能让太阳能量进入室内, 节约室内制热的能量.