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Consider steady heat transfer through the wall of a room in winter. The convection heat transfer coefficient at the outer surface of the wall is three times that of the inner surface as a result of the winds. Hence, at the inner surface, the temperature will be closer to the surrounding air temperature. Explain.

Respuesta :

The heat transfer which is in steady state, the heat transfer rate to the wall is equal to the wall.

Explanation:

  • The convection transfer of heat to the wall is

         [tex]Q=h A\left(T_{s}-T_{f}\right)[/tex]

  • Here, [tex]T_{S}[/tex] is the temperature of solid surface, [tex]T_{f}[/tex] is the temperature of moving fluid stream which is adjacent of solid surface, h is the heat transfer coefficient.
  • The coefficient of convection heat transfers outer surface contains 3 times to the inner surface which experience smaller drop of temperature for 3 times that compares to inner surface.
  • Hence, the temperatures outer surface get close to the surroundings of air temperature.

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