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.GIVENWindow: 1 m by 3 mThickness (L) = 7 mm = 0.007 mSurface temperaturesInner (Ti) = 20?C and outer (To) = 17?CThe rate of heat loss = 1040W (from the solution to Problem 1.11)The outside air temperature = ??2?CASSUMPTIONSThe system is in steady state and radiative loss through the window isnegligible

Transcribed Image Text:

L= 0.007 m To=-2°C Як To= 17°C Tj= 20°C