TY - GEN
T1 - Extrapolating Accelerated UV Weathering Data: Perspective From PVQAT Task Group 5 (Presentation)
T2 - NREL(National Renewable Energy Laboratory)
AU - Miller, David
AU - Kempe, Michael
AU - Annigoni, Eleonora
AU - Ballion, Amal
AU - Bokria, Jayesh
AU - Bruckman, Laura
AU - Burns, David
AU - Elliott, Lamont
AU - French, Roger
AU - Fowler, Sean
AU - Gu, Xiaohong
AU - Honeker, Christian
AU - Khonkar, Hussam
AU - Köhl, Michael
AU - Krommenhoek, Peter
AU - Perret-Aebi, Laure-Emmanuelle
AU - Phillips, Nancy
AU - Scott, Kurt
AU - Sculati-Meillaud, Fanny
AU - Shioda, Tsuyoshi
AU - Suga, Shigeo
AU - Watanabe, Shin
PY - 2015
Y1 - 2015
N2 - Taskgroup 5 (TG5) is concerned with a accelerated aging standard incorporating factors including ultraviolet radiation, temperature, and moisture. Separate experiments are being conducted in support of a test standard via the regional sub-groups in Asia, Europe, and the United States. The authors will describe the objectives and timeline for the TG5 interlaboratory study being directed out of theUSA. Qualitative preliminary data from the experiment is presented. To date, the encapsulation transmittance experiment has: replicated behaviors of fielded materials (including specimen location- and formulation additive-specific discoloration); demonstrated coupling between UV aging and temperature; demonstrated that degradation in EVA results from UV- aging; and obtained good qualitativecomparison between Xe and UVA-340 sources for EVA. To date, the encapsulation adhesion experiment (using the compressive shear test to quantify strength of attachment) has demonstrated that attachment strength can decrease drastically (>50%) with age; however, early results suggest significant factor (UV, T, RH) dependence. Much remains to be learned about adhesion.
AB - Taskgroup 5 (TG5) is concerned with a accelerated aging standard incorporating factors including ultraviolet radiation, temperature, and moisture. Separate experiments are being conducted in support of a test standard via the regional sub-groups in Asia, Europe, and the United States. The authors will describe the objectives and timeline for the TG5 interlaboratory study being directed out of theUSA. Qualitative preliminary data from the experiment is presented. To date, the encapsulation transmittance experiment has: replicated behaviors of fielded materials (including specimen location- and formulation additive-specific discoloration); demonstrated coupling between UV aging and temperature; demonstrated that degradation in EVA results from UV- aging; and obtained good qualitativecomparison between Xe and UVA-340 sources for EVA. To date, the encapsulation adhesion experiment (using the compressive shear test to quantify strength of attachment) has demonstrated that attachment strength can decrease drastically (>50%) with age; however, early results suggest significant factor (UV, T, RH) dependence. Much remains to be learned about adhesion.
KW - durability
KW - indoor accelerated test
KW - polymers
KW - reliability
M3 - Presentation
T3 - Presented at the 2015 NREL PV Photovoltaic Module Reliability Workshop, 24-27 February 2015, Golden, Colorado
ER -