# Lecture_5.1_Thermal_Gradient - AE202 Lecture 5.1 Thermal...

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1 AE202 Name______________________ Lecture 5.1 Thermal Gradient Date_______________________ Reference: Thermal Properties o Appendix Table E.1 to E.5 U Value - Wall Assembly 1 2 3 1. @ air space 2. @ Studs (Pine) 3. @ Insulation Brick R (per inch) = R (actual thickness) = Stud R (per inch) = R (actual thickness) = Coefficient of Transmission U value [BTU/hr-ft 2 -°F] Air space Direction of heat flow Î Mean temperature Temperature difference Thickness E R

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2 Averaging o _____% Framing o _____% Air space or insulation u average = .85(u air ) + .15(u framing ) Wall w/air space (no insulation) u avg = .85(.39) + .15(.21)=. _________ [BTU/hr•ft 2•° F] Wall w/insulation u avg = .85(.068) + .15(.21)= _________ [BTU/hr•ft 2•° F] @ Air Space @ Stud @Insulation Outside 3-1/2” Brick 3-1/2” Air Space/stud/insul ½” G.W.B. Inside Σ R u=1/ Σ R
3 Thermal Gradient Dew Point = Vapor Barrier Place Vapor barrier on: ____________________________________________ Surface Σ Ro-x Tx o-1 1-2 2-3 3-i Σ Ro-i T inside = 70º / 50%RH T outside = 10º T i -T o = T dp o i o x i o x o T T T T Σ R Σ R = = x T

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4 Framing Insulating

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