Thermodynamics HW Solutions 374

# Thermodynamics HW Solutions 374 - Chapter 4 Transient Heat...

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Chapter 4 Transient Heat Conduction 4-106 A curing kiln is heated by injecting steam into it and raising its inner surface temperature to a specified value. It is to be determined whether the temperature at the outer surfaces of the kiln changes during the curing period. Assumptions 1 The temperature in the wall is affected by the thermal conditions at inner surfaces only and the convection heat transfer coefficient inside is very large. Therefore, the wall can be considered to be a semi-infinite medium with a specified surface temperature of 45 ° C. 2 The thermal properties of the concrete wall are constant. Properties The thermal properties of the concrete wall are given to be k = 0.9 W/m. ° C and α = 0.23 × 10 -5 m 2 /s. Analysis We determine the temperature at a depth of x = 0.3 m in 3 h using the analytical solution, = t x erfc T T T t x T i s i α 2 ) , ( 2 ° C 42 ° C 30 cm Kiln wall x 0 Substituting, C 9.1 ° = = = × × = ) , ( 1782
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## This note was uploaded on 01/19/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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