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51313-02851-Prediction of Long-Term Degradation of Insulating Materials Based on Short Term Laboratory Testing

Picture for Prediction of Long-Term Degradation of Insulating Materials Based on Short Term Laboratory Testing
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Product Number: 51313-02851-SG
ISBN: 02851 2013 CP
Author: Larry Stephenson
Publication Date: 2013
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Advanced thermal insulation materials used in building envelopes to mitigate energy losses are subject to environmental aging which may degrade their performance over time. Experiments are being conducted to develop a methodology to predict durability of insulation materials and to determine R-value degradation over service life. We have investigated the degradation of insulation materials by simulating aging by exposure to elevated temperature under high moisture conditions. R-value versus time was determined for 4 commercially available insulating materials that included: (1) Fiberglass insulation (2) closed cell polyurethane foam (3) extruded polystyrene and (4) aerogel blankets.

Of the four types of samples evaluated fiberglass and extruded polystyrene insulations were only slightly affected by aging retaining over 97% of their initial R-values while the aerogels and closed cell polyurethane samples degraded by 15% and 27.5% respectively. Even though they lost significant R-value the aerogels still had the highest R-value after aging under high humidity conditions at elevated temperatures. These results have indicated that the reduction in R-values over time for closed cell polyurethanes and aerogel blankets follows an exponential decay law consistent with an Arrhenius mechanism.
 

Advanced thermal insulation materials used in building envelopes to mitigate energy losses are subject to environmental aging which may degrade their performance over time. Experiments are being conducted to develop a methodology to predict durability of insulation materials and to determine R-value degradation over service life. We have investigated the degradation of insulation materials by simulating aging by exposure to elevated temperature under high moisture conditions. R-value versus time was determined for 4 commercially available insulating materials that included: (1) Fiberglass insulation (2) closed cell polyurethane foam (3) extruded polystyrene and (4) aerogel blankets.

Of the four types of samples evaluated fiberglass and extruded polystyrene insulations were only slightly affected by aging retaining over 97% of their initial R-values while the aerogels and closed cell polyurethane samples degraded by 15% and 27.5% respectively. Even though they lost significant R-value the aerogels still had the highest R-value after aging under high humidity conditions at elevated temperatures. These results have indicated that the reduction in R-values over time for closed cell polyurethanes and aerogel blankets follows an exponential decay law consistent with an Arrhenius mechanism.
 

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