Heat Transfer-1 (color)
Heat Transfer-1 (color)
Heat Transfer-1 (color)
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Example Calculations #3<br />
Given the steel pipe with conditions described in Example #1, with<br />
10°F air surrounding the pipe and 210°F steam flowing on the<br />
inside, evaluate the convective heat transfer coefficients on each of<br />
the pipe surfaces and indicate the operating mechanisms.<br />
1) q r/A i = 16,700 Btu.hr -1 .ft -2<br />
T steam - T surface = 210 -205°F<br />
h = 16,700 / 5 = 3,340 Btu.hr -1 .ft -2 .°F -1<br />
Steam is condensing on the inside of the pipe<br />
2) q r/A o = 13,150 Btu.hr -1 .ft -2<br />
T surface - T air = 195 -10°F<br />
h = 13,150 / 185 = 71 Btu.hr -1 .ft -2 .°F -1<br />
Air must be in forced convection
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