# Problem 13-1 - Example 13-1 Seawater enters the inner tube...

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Example 13-1 Seawater enters the inner tube of a double pipe heat exchanger. In the outer tube, steam is condensed. The tube, which is made of aluminum ( k = 102 Btu/h·ft·R), has an inner diameter of 1 in. and a wall thickness of 0.125 in. On the water side, h = 150 Btu/h·ft 2 ·R and on the steam side, h = 860 Btu/h·ft 2 ·R. For the length of time the exchanger has been in service, the fouling factor is 0.0001 m 2 ·K/W on both the inside and outside. Find U i . Solution: The overall heat transfer coefficient can be found from '' ln 11 1 2 o i io tot ii i o oo D D RR R UA hA A kL A π ⎛⎞ ⎜⎟ ⎝⎠ == + + + + A DL = A = ln 1 2 o i i o D D U DL h DL DL h DL ππ =+ + + + 1 ln 1 2 i o i i oi i i o o U D D D RD D R hk D h D = ++ + +

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2 2o o '' o m C 1 ft 1.8 F 1 W 0.0001 Btu W 0.3048 m 1 C 3.412 h i R ⎛⎞ ⎜⎟ ⎛⎞⎛ = ⎜⎟⎜ ⎝⎠ ⎝⎠⎝ 4 ft F h 5.7 10 Btu i R 4 ft F h 5.7 10
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Problem 13-1 - Example 13-1 Seawater enters the inner tube...

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