Question

Question 5 - LMTD Heat Exchangers A 2 shell, 4 tube pass heat exchanger is being used to heat 50 kg/s of a process fluid in the tubes from an inlet temperature of 25°C to a target temperature of 80°C using condensing steam at 150°C. The overall heat transfer coefficient for a clean heat exchanger was U-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. (10 marks) specific heat capacity of fluid = 1000 w/m 2. K

Answer 1

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S-I. 18o'c any n. shell- & tubo page Hood eicharge 1M1): 3.kals. C181110 W/4'-K Chong 1504 (01.411. 1955. 70 94.952 70c] qoc 950 In 195 10 Bef dueto farting = 2500 Achel Hettrometer 0. My se toti) : 50 X 1070 180 25) 0 -- 2,50.000 Hatt No= 1500 wlme 0 - V.A OT) LTD A: 2,750,000 19.124² 1570X44-45 Head foran stap tak de creare but for some heat frangly rate, tube ejdafi orro 5 Moyw RP 7.05 Shull side (Rt.) = 0.0009 Mic low Rova Riit Polo 2000 4 12.00 = 182.50 wf ey?. c Voney u To ਸ਼ + = 9.74 35x10 4 3250 Vover a 1026.92 wlag? K 2,750,000 OF NALALAHO A. = 12.50 whyle 0.000% Row 102.6.328 94.95 2 29.2442 for some heat franeder id requfted more and for Heat transfer becaußen due to fooling Heat transly sate de creare . So to maintain Some ratef Heat transfer . We will increase the Area for feet franslar