To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown over the inner surface of the windshield. Consider an automobile windshield with 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. L-5 mm Outside air, -10°C h, = 200 W/m²-K Windshield k=1.4 W/m-K Inside air, 25°C AAAA T; = 0°C FIGURE P17-37

To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown over the inner surface of the windshield. Consider an automobile windshield with 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. L-5 mm Outside air, -10°C h, = 200 W/m²-K Windshield k=1.4 W/m-K Inside air, 25°C AAAA T; = 0°C FIGURE P17-37

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown
over the inner surface of the windshield. Consider an automobile windshield with 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.
L-5 mm
Outside air, -10°C
h, = 200 W/m²-K
Windshield
k= 1.4 W/m-K
Inside air, 25°C
AAAA
T; = 0°C
FIGURE P17-37

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