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(Solution) - If in Problem 1 11 the outer air temperature is 2 C

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If in Problem 1.11 the outer air temperature is ?2°C, calculate the convective heat transfer coefficient between the outer surface of the window and the air assuming radiation is negligible. Problem 1.11: Calculate the heat loss through a 1 m by 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.
GIVEN
Window: 1 m by 3 m
Thickness (L) = 7 mm = 0.007 m
Surface temperatures
Inner (Ti) = 20°C and outer (To) = 17°C
The rate of heat loss = 1040W (from the solution to Problem 1.11)
The outside air temperature = ?2°C
ASSUMPTIONS
The system is in steady state and radiative loss through the window isnegligible

 







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This question was answered on: Jul 11, 2017

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