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

能源与人工环境(英文) 2021年第3期2卷 251-259页

作者： Mingke Hu suhendri Bin Zhao Xianze Ao Jingyu Cao Qiliang Wang Saffa Riffat Yuehong Su Gang Pei Department of Architecture and Built Environment University of NottinghamUniversity ParkNottingham NG72RDUK Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China Department of Building Services Engineering The Hong Kong Polytechnic UniversityKowloonHong KongChina

Radiative cooling(RC)shows good potential for building energy saving by throwing waste heat to the cosmos in a passive and sustainable ***,most available radiative coolers suffer from low cooling *** situation becomes even deteriorated in the daytime when radiative coolers are exposed to direct *** 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 *** 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/m^(2)when the solar radiation is 800 W/m^(2),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.

关键词： Radiative cooling Sky cooling Spectral selectivity Sensitive analysis Cover Solar energy

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