Measuring and simulation of water vapour permeation into PV-modules under different climatic conditions
2010
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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