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

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

3. Schematics

4. Heat Transfer through the walls and windows
Brick
k = .72 W/m*K
L = .102m
A = 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 = m2
Sheet Rock
k = .22 W/m*K
L = m
A = m2
R = L/(k*A)
R brick = K/W
R stud = .091 K/W
R ins = .04 K/W
R sheet rock = .016 K/W
R window = K/W
R total = K/W
q = (T s,0 – T s,i )/R total
q = 7692 W

5. Heat Transfer through with double paned windows
(H/L) = 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) = 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

6. Appendices