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Chapter 3
Steady Heat Conduction
3154
A cylindrical tank filled with liquid propane at 1 atm is exposed to convection and radiation. The
time it will take for the propane to evaporate completely as a result of the heat gain from the surroundings
for the cases of no insulation and 7.5cm thick glass wool insulation are to be determined.
Assumptions
1
Heat transfer is steady.
2
Heat transfer is onedimensional.
3
The combined heat transfer
coefficient is constant and uniform over the entire surface.
4
The temperature of the thinshelled spherical
tank is said to be nearly equal to the temperature of the propane inside, and thus thermal resistance of the
tank and the internal convection resistance are negligible.
Properties
The heat of vaporization and density of liquid propane at 1 atm are given to be 425 kJ/kg and
581 kg/m
3
, respectively. The thermal conductivity of glass wool insulation is given to be
k
= 0.038
W/m
⋅
°C.
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 Fall '10
 Dr.DanielArenas
 Thermodynamics, Convection, Mass, Heat, Radiation

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