Warm air is blown over the inner surface of the windshield of an automobile to defrost ice accumulated on the outer surface. The windshield has a thickness of 5 mm and thermal conductivity of 1.4 W/m-K. The outside ambient temperature is -10°C and the convection heat transfer coefficient is 200 W/m2-K, while the ambient temperature inside the automobile is 25°C. Determine the value of the convection heat transfer coefficient for the warm air blowing over the inner surface of the windshield necessary to cause the accumulated ice to begin melting.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Warm air is blown over the inner surface of the windshield of an automobile to
defrost ice accumulated on the outer surface. The windshield has a thickness of
5 mm and thermal conductivity of 1.4 W/m-K. The outside ambient temperature is
-10°C and the convection heat transfer coefficient is 200 W/m2-K, while the ambient
temperature inside the automobile is 25°C. Determine the value of the convection
heat transfer coefficient for the warm air blowing over the inner surface of the
windshield necessary to cause the accumulated ice to begin melting.
Transcribed Image Text:Warm air is blown over the inner surface of the windshield of an automobile to defrost ice accumulated on the outer surface. The windshield has a thickness of 5 mm and thermal conductivity of 1.4 W/m-K. The outside ambient temperature is -10°C and the convection heat transfer coefficient is 200 W/m2-K, while the ambient temperature inside the automobile is 25°C. Determine the value of the convection heat transfer coefficient for the warm air blowing over the inner surface of the windshield necessary to cause the accumulated ice to begin melting.
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