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Download NFRC Simulation Manual - National Fenestration Rating Council
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7. TOTAL PRODUCT CALCULATIONS USING WINDOW 7.4 Overall Product U-factor, SHGC, VT, and CR Calculations 6. Determine the Sightline Group Leader The sightline group leader is the mid-point of each band: Group leader = Areadaylight,largest – [(Group Leader Number - 0.5) * GABW)] So, for example: 1st group leader = Areadaylight,largest – (0.5) * GABW) 2nd group leader = Areadaylight,largest – (1.5 * GABW) 3rd group leader = Areadaylight,largest – (2.5 * GABW) And so forth for the number of GABW calculated. 7. Calculate SHGC and VT for each Sightline Group Leader Model each group leader and use the SHGC0, SHGC1, VT0, and VT1 numbers to calculate the SHGC and VT for each group. THERM6.3/WINDOW6.3 NFRC Simulation Manual June 2013 7-11
