Calculate the heat loss through a 1-m *3-m glass window 7-mm-thick if the inner surface temperature is 20°C and the outer surface temperature is 17°C. Comment on the possible effect of radiation on your answer.
IVEN
• Window: 1 m by 3 m
• Thickness (L) = 7 mm = 0.007 m
• Surface temperature
? Inner (Ti) = 20°C
? outer (To) = 17°C
FIND
• The rate of heat loss through the window (q) ASSUMPTIONS
• One dimensional, steady state conduction through the glass
• Constant thermal conductivity
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity of glass (k) = 0.81 W/(m K)
The heat loss by conduction through the window is
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