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A novel thermal model for PV panels with back surface spray cooling

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  • Bevilacqua, Piero
  • Bruno, Roberto
  • Rollo, Antonino
  • Ferraro, Vittorio

Abstract

To improve the performances of photovoltaic panels, water-based cooling systems have been considered as an interesting solution. This study proposes a novel mono-dimensional thermal model that includes the spray cooling phenomena on the back surface. The model is based on the energy balance method with a Finite Difference approach providing the thermal field across the thickness, and was validated with data of an experimental setup with a PV panel equipped with two spray nozzles. Simulations were carried out over a large number of days in the summer period with a short time step (5 s). Results showed an average RMSE of 1.37 °C, RMSEP of 0.005% and NSE of 96.5% for the back surface temperature, and an average RMSE of 3.39 W, RMSEP of 0.36% and NSE of 99.6% for the electric power. A further assessment of the cooling phenomenon highlighted the contribution of sensible and latent energy exchanges to the panel energy balance. Finally, a comparison of the performances with a non-cooled PV panel showed an average increase of 7.8% of the electric power in solar radiation peak hours and a reduction of 28.2% of the average cell temperature.

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  • Bevilacqua, Piero & Bruno, Roberto & Rollo, Antonino & Ferraro, Vittorio, 2022. "A novel thermal model for PV panels with back surface spray cooling," Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222013044
    DOI: 10.1016/j.energy.2022.124401
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