Part A Some properties of glass are listed here. Density: 2300 kg/m^3 Specific h
ID: 1610446 • Letter: P
Question
Part A Some properties of glass are listed here.
Density: 2300 kg/m^3
Specific heat: 840 J/kg·C°
Coefficient of linear thermal expansion: 8.5 × 10^-6 (C°)^-1
Thermal conductivity: 0.80 W/(m·C°)
A glass window pane is 1.8 m high, 1.5 m wide, and 2.0 mm thick. The temperature at the inner surface of the glass is 20°C and at the outer surface 4.0°C. How much heat is lost each hour through the window under steady state conditions?
Answer choices
a.) 1.7×104 J
b.) 6.2×105 J
c.) 17 J
d.) 6.2×104 J
e.) 6.2×107 J
Thank you for your help. It is appreciated.
Explanation / Answer
rate of heat transfer P = K*A*dT/l
amount of heat transfer Q = P*t
Q = K*A*dT*t/l
K = thermal conductivity
A = area of cross section = 1.8*1.5
l = thickness
dT = temperature difference
t = time interval
Q = 0.8*1.8*1.5*(20-4)*60*60/(2*10^-3)
Q = 6.2*10^7 J <<<-answer
OPTION (e)
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