19 August 2010 Measuring and simulation of water vapour permeation into PV modules under different climatic conditions
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This paper is dealing with measuring the water ingress to PV-modules under different climatic conditions and simulating it over an expected lifetime of 20 years. Furthermore different kinds of back sheet / encapsulant combinations were considered. For this purpose an own developed high sensitive test device composed of a climate cabinet and a mass spectrometer was used to investigate the temperature dependent permeation and diffusion processes that takes place in the polymers. Furthermore the results - permeation and diffusion coefficient - were used to simulate the mass transport through the back sheet and inside the encapsulant materials. In a second part the amount of absorbed water was analysed by a gravimetric method. For this study encapsulant materials were exposed to different ambient climates to quantify the sorption isotherme. With these results - permeation / diffusion coefficient and absorbed water amount - the mass transport and water concentration were simulated over the lifetime of a PV-module under different climatic conditions. Additional the influence of various tight back sheets on water ingress will be shown.
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P. Hülsmann, P. Hülsmann, M. Jäger, M. Jäger, K.-A. Weiss, K.-A. Weiss, M. Köhl, M. Köhl, } "Measuring and simulation of water vapour permeation into PV modules under different climatic conditions", Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 777307 (19 August 2010); doi: 10.1117/12.860598; https://doi.org/10.1117/12.860598

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