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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

A SIMPLIFIED PANEL FOR BOTH DIURNAL PHOTOVOLTAIC CONVERSION AND NOCTURNAL RADIATIVE COOLING

Get access (open in a dialog) DOI: 10.1615/IHTC16.nee.022440
pages 7812-7817

要約

Radiative cooling has recently drawn much attention for its potential as a passive method for thermal management. Here, we will consider the possibility of combining diurnal photovoltaic (PV) conversion and nocturnal radiative cooling (RC) process in a single system (PV-RC system). We know that conventional PV panel has high solar absorption within PV conversion band to enlarge electricity production, whereas single RC emitter exhibits high emissivity within atmospheric window (i.e., 8 μm ~ 13 μm) to achieve space cooling. Thus, integrating aforementioned two spectral characteristics in a single unit is a feasible method for PV-RC hybrid system. Considering the cooling of PV cells in diurnal PV process, high emissivity of such a unit in thermal radiation band (i.e., 4 μm ~ 25 μm) is better than that just in atmospheric window(i.e., 8 μm ~ 13 μm) . In this work, a composite panel was proposed and manufactured by laminating mono-crystalline cells onto a 3.2mm glass for trial to achieve both diurnal PV and nocturnal RC. The result of spectral characterization shows such a panel exhibits high spectral emissivity (absorptivity) in PV conversion band and thermal radiation band (i.e., 0.3μm ~ 1.1 μm and 4 μm ~ 25 μm). A simplified PV-RC hybrid system was also mounted and the experiments were carried out both at daytime and nighttime in Hefei, China. It is found that the diurnal PV conversion efficiency of the system is approximately 11.75% and the nocturnal equilibrium temperature of panel is about 10.0° lower than ambient temperature, which proves that such a panel has considerable performance for both diurnal PV and nocturnal RC. This work advances the applications of exploiting solar energy harvesting and radiative cooling utilization.