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P_cond= Q/t=kA (T_(h )- T_c)/L R=L/K P_cond= Q/t=A (T_(h )- T_c)/R P_cond = Thermal energy transferred per unit time [BTU/hr] Q = Heat [BTU] t = Time [hr] k = Thermal conductivity of material [BTU/(hr*ft*° F)] A = Area [sq ft] T_(h ) = Hot temperature [° F] T_c = Cold temperature [° F] L = Thickness of material R = Thermal resistance of material [BTU/(hr*sq ft*° F)] Annual Heat = (A*HI)/(R*yr) = loss/yr Annual Heat = (h*HI)/(R*ft-yr) loss/(ft-yr) HI = Annual Heating Index= 13980 F*days/year for Fairbanks h = Height of wall = 8ft
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