Thermodynamics HW Solutions 27

Thermodynamics HW Solutions 27 - Chapter 1 Basics of Heat...

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Chapter 1 Basics of Heat Transfer 1-65 Heat is transferred steadily to boiling water in the pan through its bottom. The inner surface of the bottom of the pan is given. The temperature of the outer surface is to be determined. Assumptions 1 Steady operating conditions exist since the surface temperatures of the pan remain constant at the specified values. 2 Thermal properties of the aluminum pan are constant. Properties The thermal conductivity of the aluminum is given to be k = 237 W/m ⋅° C. Analysis The heat transfer area is A = π = (0.1 m)² = 0.0314 m² Under steady conditions, the rate of heat transfer through the bottom of the pan by conduction is & Qk A T L kA TT L == Δ 21 105 ° C 800 W Substituting, m 0.004 C 105 ) m C)(0.0314 W/m (237 W 800 2 2 ° ° = T 0.4 cm which gives T 2 = 105.43 ° C 1-66E The inner and outer surface temperatures of the wall of an electrically heated home during a winter night are measured. The rate of heat loss through the wall that night and its cost are to be determined.
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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