Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system

Hu, Mingke; Pei, Gang; Wang, Qiliang; Li, Jing; Wang, Yunyun; Ji, Jie

Abstract

© 2016 A type of composite surface was manufactured for trial to achieve integrated solar heating and radiative cooling functions. The spectral properties of the composite surface present a relatively clear selectivity in the spectra of solar heating and radiation cooling wavelengths. A combined system for both solar heating and radiative cooling (named SH-RC system) based on the composite surface was mounted together with a traditional flat-plate solar heating system. Comparative experiments were carried out to investigate their thermal performances both at daytime and nighttime. Results showed that the composite surface has a relatively evident spectral selectivity. In diurnal collector testing mode, the thermal efficiency of the SH-RC collector was 62.7% at zero-reduced temperature, which was about 86.4% of that of the traditional flat-plate solar heating collector. In nocturnal collector testing mode, the SH-RC collector had net radiative cooling powers of 50.3 W/m2 on a clear night and 23.4 W/m2 on an overcast night; by contrast, the traditional flat-plate solar heating collector exhibited very little radiative cooling capacity. In diurnal system testing mode, the daily average thermal efficiency of the SH-RC system and the traditional flat-plate solar heating system at zero-reduced temperature was 38.6% and 48.4%, respectively. Based on experimental results, the SH-RC system showed a considerable performance for both diurnal solar heating and nocturnal radiative cooling.

Citation

Hu, M., Pei, G., Wang, Q., Li, J., Wang, Y., & Ji, J. (2016). Field test and preliminary analysis of a combined diurnal solar heating and nocturnal radiative cooling system. Applied energy, 179, 899-908. https://doi.org/10.1016/j.apenergy.2016.07.066

• Journal Article Type: Article
• Acceptance Date: Jul 16, 2016
• Online Publication Date: Jul 25, 2016
• Publication Date: Oct 1, 2016
• Deposit Date: Mar 24, 2022
• Publicly Available Date: May 23, 2022
• Journal: Applied Energy
• Print ISSN: 0306-2619
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 179
• Pages: 899-908
• DOI: https://doi.org/10.1016/j.apenergy.2016.07.066
• Keywords: Solar heating; Radiative cooling; Atmospheric window; Thermal performance
• Public URL: https://hull-repository.worktribe.com/output/3602668