Daytime radiative cooling using pattern free metal dielectric coating

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2024-11-06 DOI:10.1016/j.ijleo.2024.172098

Jitendra Kumar Pradhan , Dheeraj Pratap

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引用次数: 0

Abstract

Radiative coolers, which dumps the excess heat to the cold outer space by releasing the thermal radiation through the atmospheric window, have offered an alternate and feasible solution to the conventional coolers that are fuelled on the electricity produced by either using renewal or non-renewal sources like fossil fuels. Particularly, daytime passive radiative coolers have paved the way for many energy free technology that are used in reducing the temperature of building tops, power plants, and water harvesting. In this, we propose a pattern free and large area scalable bi-layered thin film based daytime radiative cooler. The proposed design illustrates an average reflectivity of 98.5% for the solar spectrum, while showing average emittance of 91% within the atmospheric window (8-

13 μ m

). The design consists of thin films of transparent dielectrics such as ZnS or BaF₂ placed on top of a thick glass substrate, that is backed by a thin film of silver. We theoretically obtained a cooling power of 119 W m⁻² with a temperature reduction of 9 °C below the ambient.

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利用无图案金属介质涂层进行日间辐射制冷

辐射冷却器通过大气窗口释放热辐射，将多余的热量释放到寒冷的外层空间，为传统冷却器提供了一种替代和可行的解决方案，传统冷却器的电力来源是化石燃料等可再生或不可再生资源。特别是，日间被动辐射冷却器为许多用于降低建筑物顶部温度、发电厂和水收集的无能源技术铺平了道路。在本文中，我们提出了一种无图案、可大面积扩展的基于双层薄膜的日间辐射冷却器。建议的设计对太阳光谱的平均反射率为 98.5%，而在大气窗口（8-13μm）内的平均发射率为 91%。该设计由透明电介质薄膜（如 ZnS 或 BaF2）组成，置于厚玻璃基板之上，基板背面有一层银薄膜。我们从理论上获得了 119 W m-2 的冷却功率，温度比环境温度降低了 9 °C。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.