The t 4-mm-thick glass windows of an automobile have a

Chapter , Problem 3.2

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The t 4-mm-thick glass windows of an automobile have a surface area of A 2.6 m2 . The outside temperature is T,o 32 C while the passenger compartment is maintained at T,i 22 C. The convection heat transfer coefficient on the exterior window surface is ho 90 W/m2 K. Determine the heat gain through the windows when the interior convection heat transfer coefficient is hi 15 W/m2 K. By controlling the air- flow in the passenger compartment the interior heat transfer coefficient can be reduced to hi 5 W/m2 K without sacrificing passenger comfort. Determine the heat gain through the window for the reduced inside heat transfer coefficient

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