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Passive radiative cooling, making use of a sky-facing surface simultaneously reflecting solar radiation and emitting mid-infrared radiation to preserve a sub-ambient surface temperature, inspired many novel engineering applications. This article reviews recent progresses on radiative cooling applications for thermal and electrical energy harvesting. Chilled water collection is a form of thermophotonic energy conversion enabled by a fluid-wall heat transfer interface. Discussed by thermal and energy responses of a chilled water collection system subjected to a perturbation in fluid flow and verified by a proof-of-concept experiment, it was shown that water temperature reduction and energy conversion efficiency are always inversely correlated, in which temperature reduction decreases with increasing flow rate, but efficiency increases with increasing flow rate. Moreover, thermoelectricity generation is a form of thermoelectrical energy conversion facilitated by radiative cooling. Demonstrated by a field investigation, it enables direct electricity generation from a renewable resource at nighttime, realizes 24-hour unstopped electricity generation with a deliverable electrical voltage up to 20 mV. However, radiative cooling and derived energy conversion performances can be hindered by local weather conditions heavily. Field investigative results on the surface temperature reduction, as a cardinal indicator on radiative cooling performance, can be correlated with the sky temperature which is a lumped parameter of ambient temperature, relative humidity and cloudiness. This reveals the difficulty in tropical and subtropical radiative cooling, where the cooling demand is the most. Possible overcoming solutions are highlighted for further research and development.

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  This is an Accepted Manuscript of a book chapter published by Routledge/CRC Press in Thermal Plasmonics and Metamaterials for a Low-Carbon Society on 3 June 2024, available online: http://www.routledge.com/9781003409090 or http://www.crcpress.com/9781003409090

Keyword: Radiative cooling, Thermal radiation, Optical nanostructure

Date published: 2024-03-20

Publisher: CRC Press, Taylor & Francis Group

Journal:

• Thermal plasmonics and metamaterials for low carbon society

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4790

First published URL: https://doi.org/10.1201/9781003409090

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Updated at: 2025-06-03 08:30:07 +0900

Published on MDR: 2025-06-03 08:23:31 +0900