To defog the rear window of an automobile, a very thin transparent heating element is attached to the inner surface of the window. A uniform heat flux of 1300 W/m2 is provided to the heating element for defogging a rear window with thickness of 5 mm. The interior temperature of the automobile is 22°C and the convection heat transfer coefficient is 15 W/m2·K. The outside ambient temperature is -5°C and the convection heat transfer coefficient is 100 W/m2·K. If the thermal conductivity of the window is 1.2 W/m·K, determine the inner surface temperature of the window.
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
To defog the rear window of an automobile, a very
thin transparent heating element is attached to the inner surface
of the window. A uniform heat flux of 1300 W/m2 is
provided to the heating element for defogging a rear window
with thickness of 5 mm. The interior temperature of the automobile
is 22°C and the
15 W/m2·K. The outside ambient temperature is -5°C and
the convection heat transfer coefficient is 100 W/m2·K. If the
thermal
the inner surface temperature of the window.
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