Abstract Passive radiative daytime cooling is a low-cost solution to improve human comfort and reduce the energy demands of cooling on a global scale. We present the first demonstration of direct full-sun daytime radiative cooling using an all-polymer filter that blocks solar irradiance while maintaining high transmittance in the long-wave infrared (LWIR). Warm objects and surfaces radiatively transfer heat through the polymer solar filter to the cold sink of space, decreasing temperatures up to 10 °C during day and night. The polyethylene (PE) filter exploits scattering by size-controlled air pores to maximize reflection of solar photons, while preserving the LWIR transparency inherent to PE. We demonstrated cooling power of over 110 W/m2 for an emissive surface placed beneath the solar filter. Scalable, low-cost manufacturing of a radiative cooling polymer solar filter allows direct full-sun daytime cooling of heat-emitting surfaces in a variety of settings.

中文翻译：

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用于实现白天直接辐​​射冷却的聚合物太阳能过滤器

摘要 被动辐射白天制冷是一种低成本的解决方案，可在全球范围内提高人类舒适度并降低制冷的能源需求。我们首次展示了使用全聚合物滤光片进行全太阳日间辐射冷却的演示，该滤光片可阻挡太阳辐照度，同时保持长波红外 (LWIR) 的高透射率。温暖的物体和表面通过聚合物太阳能过滤器将热量辐射传递到太空的冷阱，白天和黑夜的温度降低高达 10 °C。聚乙烯 (PE) 过滤器利用尺寸控制的气孔散射来最大限度地反射太阳光子，同时保留 PE 固有的 LWIR 透明度。对于放置在太阳能过滤器下方的发射表面，我们展示了超过 110 W/m2 的冷却能力。可扩展，