PV panels are affected by many degradation modes. We list the Potential Induced Degradation, the Light Induced Degradation, the UltraViolet Light Degradation, the Moisture Induced Degradation, and the Cell Cracks. These degradation modes are affected by external environmental conditions as irradiance, temperature and humidity. The common factor that affects the degradation modes is temperature. The degradation process follows an Arrhenius equation; it is exponentially related to temperature. In this paper we evaluate precisely the effect of temperature on the degradation process of PV panels.

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To cite this version:Bechara Nehme, Nkm 'Sirdi, Tilda Akiki. A geometric approach for PV modules degradation. REDEC-2014, Nov 2014 A geometric approach for PV modules degradation Abstract-This paper presents an overview of two degradation modes of PV panels: the Moisture Induced Degradation and the Cell Cracks. The two mentioned degradation modes affect PV cells differently according to their position in the module. At a previous stage, we have build a PV model that takes into consideration three degradation modes, the Potential Induced Degradation, the Light Induced Degradation, and the Ultraviolet Light Degradation. In this paper, we update our model to take into consideration all degradation modes.

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For the past years, many studies have been conducted to understand and analyze the behavior of fuel cells in order to improve this source of energy. In our present work, we are interested in polymer electrolyte membrane (PEM) type fuel cells (FC) often encountered in transportation; we investigate the effects of FC compression on the properties of the cell. We first analyze the influence of different pressures (applied on graphite or steel bipolar plates BP) on the porosity, permeability, and deformation of the gas diffusion layer (GDL) and then we evaluate these local fields of GDL porosity and permeability. Moreover, a new numeric approach based on fluid mechanics is elaborated to study the effects of mechanical compression of the GDL on the performance of the cell through the variation of the local pressure at the GDL/BP interface. Finally, we model the contact resistance between the GDL and the BP and then calculate the local electrical resistivity field at this interface. These effects of FC compression are incorporated into a multiphysical model that considers the chemical phenomena and the effects of mechanical compression of the fuel cell to correctly simulate and report the polarization and power density curves and to conclude about the performance of the cell. It was found that the GDL porosity and permeability as well as the pressure at the interface between the GDL and the BP vary locally with compression and should not be kept constant. Also, it was found that the compression applied on the FC decreases the contact resistance and the effect of contact resistance at the GDL/BP interface is smaller than that of electrolyte resistance which is a source for current limitation.