Calculate the temperatures of the inside and outside surfaces of the metal pipe or tubing in cases

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Calculate the temperatures of the inside and outside surfaces of the metal pipe or tubing in cases 1 to 3 of Prob. 11.1.

Cases 1 to 3 of Prob. 11.1

Calculate the overall heat-transfer coefficients based on both inside and outside areas for the following cases. 

Case 1    Water at 10°C flowing in a 3/4-in. 16 BWG condenser tube and saturated steam at 105°C condensing on the outside. h= 12 kW/m2 · °C. h = 14 kW/m2∙°C. km = 120 W/m · °C. 

Case 2    Benzene condensing at atmospheric pressure on the outside of a 25-mm steel pipe and air at 15°C flowing within at 6 m/s. The pipe wall is 3.5 mm thick. hi = 20 W/m · °C. h = 1.200 W/m2 · °C. km = 45 W/m · °C. 

Case 3    Dropwise condensation from steam at a pressure of 50 lbƒ/in.2 gauge on a 1-in. Schedule 40 steel pipe carrying oil at 100°F, h = 14,000 Btu/ft2 · h · °F.  h=130 Btu/ft2 · h · °F. k= 26 Btu/ft · h · °F.

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Unit Operations Of Chemical Engineering

ISBN: 9780072848236

7th Edition

Authors: Warren McCabe, Julian Smith, Peter Harriott

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