Why is there a difference between the ACCURATE and the BERS Pro NFRC values for the same window?
The discrepancy between the NFRC U values and SHGC displayed in BERS Pro and those displayed in ACCURATE has arisen because of the frame fractions chosen. The standard window size that is used to calculate NFRC values is 1500×1800 mm. This window size usually has a divider. I have calculated the frame fraction assuming a divider. The ACCURATE values have been calculated without a divider. This results in the current BERS Pro U values being larger and the SHGC being smaller than in ACCURATE. Even though I think that the way I have done this is more correct, I have now changed my algorithms to give the same values as ACCURATE.
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