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Measuring and simulation of water vapour permeation into PV modules under different climatic conditions

: Hülsmann, P.; Jäger, M.; Weiss, K.-A.; Köhl, M.


Dhere, N.G. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Reliability of photovoltaic cells, modules, components, and systems III : 3 - 5 August 2010, San Diego, California, United States
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7773)
ISBN: 978-0-8194-8269-3
Paper 777307
Reliability of Photovoltaic Cells, Modules, Components, and Systems Conference <3, 2010, San Diego/Calif.>
Conference Paper
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; Silicium-Photovoltaik; Photovoltaische Module und Kraftwerke; Modulintegration; Modulentwicklung; Modultechnologie und -analyse

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.