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

Physics & Space Science

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