GATE ME 2015 Set 3 — Question 64
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Heat Transfer → Conduction → 1D Steady Conduction
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Question
A brick wall () of thickness separates the warm air in a room from the cold ambient air. On a particular winter day, the outside air temperature is and the room needs to be maintained at . The heat transfer coefficient associated with outside air is . Neglecting the convective resistance of the air inside the room, the heat loss, in , is
Correct answer
(C) 128
Solution
Given:
Thermal conductivity of brick wall,
Thickness of wall,
Inside room temperature,
Outside ambient temperature,
Outside convective heat transfer coefficient,
Inside convective resistance is neglected ().The total thermal resistance per unit area is:The heat loss per unit area () is given by:Thus, the correct option is (C).
Thermal conductivity of brick wall,
Thickness of wall,
Inside room temperature,
Outside ambient temperature,
Outside convective heat transfer coefficient,
Inside convective resistance is neglected ().The total thermal resistance per unit area is:The heat loss per unit area () is given by:Thus, the correct option is (C).
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