Radiative cooling is the process to dissipate heat to the outer space through an atmospheric window (8–13 μm), which has great potential for energy savings in buildings. However, the traditional “static” spectral characteristics of radiative cooling materials may result in overcooling during the cold season or at night, necessitating the development of dynamic spectral radiative cooling for enhanced energy saving potential. In this study, we showcase the realization of dynamic radiative cooling by modulating the heat transfer process using a tunable transmittance convection shield (TTCS). The transmittance of the TTCS in both solar spectrum and atmospheric window can be dynamically adjusted within ranges of 28.8–72.9 and 27.0–80.5%, with modulation capabilities of ΔT_solar = 44.1% and ΔT_8–13 μm = 53.5%, respectively. Field measurements demonstrate that through the modulation, the steady-state temperature of the TTCS architecture is 0.3 °C lower than that of a traditional radiative cooling architecture during the daytime and 3.3 °C higher at nighttime, indicating that the modulation strategy can effectively address the overcooling issue, offering an efficient way of energy saving through dynamic radiative cooling.

中文翻译：

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用于动态辐射冷却的机械可调透射率对流屏蔽

辐射冷却是通过大气窗口（8-13μm）将热量散发到外层空间的过程，在建筑节能方面具有巨大潜力。然而，传统的“静态”辐射冷却材料的光谱特性可能会导致在寒冷季节或夜间过冷，因此需要开发动态光谱辐射冷却以增强节能潜力。在这项研究中，我们展示了通过使用可调透射率对流屏蔽（TTCS）调节传热过程来实现动态辐射冷却。 TTCS在太阳光谱和大气窗口的透过率均可在28.8-72.9和27.0-80.5%范围内动态调节，调制能力分别为Δ T _Solar = 44.1%和Δ T _{8-13 μm} = 53.5% 。现场测量表明，通过调制，TTCS架构的稳态温度白天比传统辐射冷却架构低0.3℃，夜间高3.3℃，表明该调制策略可以有效解决传统辐射冷却架构的稳态温度问题。过冷问题，通过动态辐射冷却提供有效的节能方式。