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Qslab = F-value x HTDh + Lexposed slab edge

Where:

 

 Qslab                = Total heat loss through slab, Btuh
 F-value                = F-value for slab from Table 4A Manual J 8, Btuh/ft·°F
 HTDh                = Winter temperature difference (inside temperature - outside temperature), °F
 Lexp.                = Perimeter of exposed slab edge for current room, zone, or structure, ft

 

Ref: Manual J 8 - Page 3-2