Jacob Allen J. Erik Hulme ME 340 Semester Project Jacob Allen J. Erik Hulme

Objective 1. Heat Transfer through the walls and windows. 2. Heat Transfer through the walls and windows if the windows are double paned.

Schematics

Heat Transfer through the walls and windows Brick k = .72 W/m*K L = .102m A = 74.38 m2   Glass k = 1.4 W/m*K L = .06 m A = 10 m2 Stud k = .16 W/m*K L = .102 m A = 6.99 m2 Insulation k = .038 W/m*K L = .102 m A = 67.41 m2 Sheet Rock k = .22 W/m*K L = .0254 m A = 74.38 m2 R = L/(k*A)   R brick = .0019 K/W R stud = .091 K/W R ins = .04 K/W R sheet rock = .016 K/W R window = .0043 K/W R total = .0039 K/W q = (T s,0 – T s,i )/R total q = 7692 W

Heat Transfer through with double paned windows (H/L) = 9.21 Therefore: Nul = .22(Pr* Ral /.2+Pr).028 +(H/L)-.25 Nul = .193 Ral = gβ(T1 – T2) L3 /αν Ral = 4.97 * 10-6 h = Nul*(k/L) = .0436 W/m2*K Diagram of Window: Rair = 1/h*A = 2.29 K/W Rtot = .045 K/W q = (T s,0 – T s,i )/R total q = 667 W q is reduced by a factor of 11.5

Appendices