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Effect of the spectrally selective features of the cover and emitter combination on radiative cooling performance

Hu, Mingke; Suhendri; Zhao, Bin; Ao, Xianze; Cao, Jingyu; Wang, Qiliang; Riffat, Saffa; Su, Yuehong; Pei, Gang

Effect of the spectrally selective features of the cover and emitter combination on radiative cooling performance Thumbnail


Authors

Mingke Hu

Suhendri

Bin Zhao

Xianze Ao

Jingyu Cao

Qiliang Wang

SAFFA RIFFAT saffa.riffat@nottingham.ac.uk
Professor of Sustainable Energy Systems

YUEHONG SU YUEHONG.SU@NOTTINGHAM.AC.UK
Professor of Thermal Science and Building Technology

Gang Pei



Abstract

Radiative cooling (RC) shows good potential for building energy saving by throwing waste heat to the cosmos in a passive and sustainable manner. However, most available radiative coolers suffer from low cooling flux. The situation becomes even deteriorated in the daytime when radiative coolers are exposed to direct sunlight. To tackle this challenge, an idea of employing both a spectrally selective cover and a spectrally selective emitter is proposed in this study as an alternative approach. A comparative study is conducted among four RC modules with different spectral characteristics for the demonstration of how the spectral profiles of the cover and the emitter affects the RC performance. The results under given conditions show that the RC module with a spectrally selective cover and a spectrally selective emitter (SC/SE) reaches a net RC power of 62.4 W/m2 when the solar radiation is 800 W/m2, which is about 1.8 times that of the typical RC module with a spectrally non-selective cover and a spectrally selective emitter (n-SC/SE). When the ambient temperature is 30°C, the SC/SE based RC module realizes a daytime sub-ambient temperature reduction of 20.0°C, standing for a further temperature decrement of 9.2°C compared to the n-SC/SE based RC module.

Citation

Hu, M., Suhendri, Zhao, B., Ao, X., Cao, J., Wang, Q., …Pei, G. (2021). Effect of the spectrally selective features of the cover and emitter combination on radiative cooling performance. Energy and Built Environment, 2(3), 251-259. https://doi.org/10.1016/j.enbenv.2020.06.008

Journal Article Type Article
Acceptance Date Jul 6, 2020
Online Publication Date Jul 6, 2020
Publication Date 2021-06
Deposit Date Aug 5, 2020
Publicly Available Date Mar 29, 2024
Journal Energy and Built Environment
Print ISSN 2666-1233
Publisher Ke Ai Publishing Communications Ltd.
Peer Reviewed Peer Reviewed
Volume 2
Issue 3
Pages 251-259
DOI https://doi.org/10.1016/j.enbenv.2020.06.008
Public URL https://nottingham-repository.worktribe.com/output/4810546
Publisher URL https://www.sciencedirect.com/science/article/pii/S2666123320300647

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