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(LMTD method) A 2 shell, 4 tube pass heat exchanger is being used to heat 40 kg/s of a process fluid in the tubes from an inlet temperature of 15°C to a target temperature of 70°C using condensing steam at 150°C. The overall heat transfer coefficient for a clean heat exchanger was Uo=1500W/m2.°C, however, the design engineer neglected to take into account fouling of the heat exchanger. After 5 years of use, fouling has occurred with fouling factors of 0.0005m2.°C/W (on the tube side) and 0.0008 m2.°C/W (on the shell side) estimated to need to be used to determine whether the heat transfer area is still sufficient or whether there needs to be a change of steam inlet temperature. Taking into account the fouling, determine what the heat transfer area of the exchanger is before and after fouling.

Cp (process fluid) = 2280 J/kg.K

1.0 0.9 1 0.8 Correction factor F R=4.01 3.0 2.0.1.5 L 1.0 0.8.0.6 0.4 0.2 0.7 0.6 R= T-T 12-11 0.5 0.2 1.0 P= 0 0.1 0.3 0.4


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