Thermodynamics HW Solutions 265

Thermodynamics HW Solutions 265 - Chapter 3 Steady Heat...

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Chapter 3 Steady Heat Conduction 3-155 Hot water is flowing through a 3-m section of a cast iron pipe. The pipe is exposed to cold air and surfaces in the basement, and it experiences a 3°C-temperature drop. The combined convection and radiation heat transfer coefficient at the outer surface of the pipe is to be determined. Assumptions 1 Heat transfer is steady since there is no indication of any significant change with time. 2 Heat transfer is one-dimensional since there is thermal symmetry about the centerline and no significant variation in the axial direction. 3 Thermal properties are constant. Properties The thermal conductivity of cast iron is given to be k = 52 W/m °C. Analysis Using water properties at room temperature, the mass flow rate of water and rate of heat transfer from the water are determined to be & & (/ & & (. ) ( ) mV V A Qm CT cc p == = = ° ° ρρ π 1000 4 106 70 67 kg / m )(1.5 m / s)
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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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