Solar and thermal management of transparent windows is important for the energy efficiency of human-made structures. Functional layers that partially block solar radiation would also be heated by sunlight, thus accelerating the interior heat exchange and increasing daytime cooling energy consumption. Here, we propose a strategy to improve energy efficiency through window cooling using a transparent double-layer coating, which comprises a near-infrared reflective underlayer and a high mid-infrared emissive top layer. The addition of a top emitter can decrease the temperature of the near-infrared reflective window up to ∼7°C in outdoor tests, and can provide extra cooling energy savings ranging from 20 to 49 MJ ⋅ m⁻² ⋅ year⁻¹ for a typical building located in 11 cities worldwide. This accounts for ∼3%–∼8% of their total annual cooling energy consumption and indicates the significant impact of window cooling on interior energy efficiency.

透明窗户的太阳能和热管理对于人造结构的能源效率非常重要。部分阻挡太阳辐射的功能层也将被日光加热，从而加速内部热交换并增加白天的冷却能耗。在这里，我们提出了一种策略，可通过使用透明双层涂层的窗户冷却来提高能源效率，该涂层包括一个近红外反射底层和一个高中红外发射顶层。加入顶部发射器的可降低室外试验的近红外反射窗口高达~7°C的温度，并能提供额外的冷却能量节约范围从20到49 MJ⋅米^-2 ⋅年^-1位于全球11个城市的典型建筑。这约占其年度制冷总能耗的3％至8％，这表明窗户制冷对室内能效的显着影响。