Experimental and simulation analysis of thermal transmittance of vacuum insulated glazing for predicting service life / Alexander Hayes, Travis Moore, Marzieh Riahinezhad. : NR24-144/2026E-PDF

"To determine whether high performance glazing systems such as vacuum insulated glazing (VIG) units will maintain their insulating properties over their service life, a series of accelerated ageing tests must be employed. However, in order to determine whether there has been any change to the insulating properties of the insulating glazing units during the accelerated aging process, quantifiable metrics such as thermal transmittance must be periodically measured. Following current guidelines such as the National Fenestration Rating Council (NFRC) 100-2020, the thermal transmittance of glazing systems can be determined through experimental testing and/or computer simulations. This paper outlines a proposed testing procedure along with a list of assumptions used to compare thermal transmittance values calculated from experimental measurements to those calculated through computer simulations for VIG units. The procedure will first compare the temperature dependent center-of-glass (COG) thermal transmittance (U-factor) results for VIG tested in a heat flow meter to the thermal transmittance values generated from guarded hot box testing, guided by both ISO and ASTM protocols. The experimentally measured results will then be used as a means of validating the estimated COG and total thermal transmittance results generated through computer simulations following NFRC guidelines using WINDOW and THERM software. The results of both the measured and predicted thermal transmittance values will then be used as a baseline for unaged VIG samples before they are subjected to future accelerated aging testing and degradation analysis. Future measurements will seek to develop degradation curves for VIG units, enabling more accurate computer simulation to better predict the total operational energy savings and thermal comfort metrics of VIG during service life. This will support broader adoption of high-performance glazing systems"--Abstract, page 1.

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