Heat Chap12-074

# Heat Chap12-074 - Chapter 12 Radiation Heat Transfer...

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0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 V h Chapter 12 Radiation Heat Transfer 12-80 The convection heat transfer coefficient for a clothed person while walking in still air at a velocity of 0.5 to 2 m/s is given by h = 8.6 V 0.53 where V is in m/s and h is in W/m 2 . C. The convection coefficients in that range vary from 5.96 W/m 2 . C at 0.5 m/s to 12.4 W/m 2 . C at 2 m/s. Therefore, at low velocities, the radiation and convection heat transfer coefficients are comparable in magnitude. But at high velocities, the convection coefficient is much larger than the radiation heat transfer coefficient.
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