please use the ntu method not the lmtd method

QUESTION 1 A counter-flow shell-and-tube heat exchanger with 2-shell passes and 8-tube passes is used to heat ethyl alcohol (Cp = 2670 J/kg.C) in the tubes from 28 to 72 C at a rate of 2 kg/s. The heating is to be done by water (Cp = 4190 J/kg.C) that enters the shell at 92 C and leaves at 56 C. (a) Sketch the process and locate different variables listed above within the heat exchanger setup. (6) (b) If the overall heat transfer coefficient is 1000 W/m2.C, determine the heat transfer surface area of the heat exchanger using the e-NTU method. Please refer to Figures 1.1 and 1.2 and Tables 1.1 and 1.2. (22) TOTAL /28/ 100 =0 80 60 40 20 Effectiveness &, % veness E, % IC max Cmin/C 0.25 0.50 0.75 1.00 Shell fluid -Tube fluid 0 1 2 3 4 5 Number of transfer units NTU = A,UIC min Figure 1.1: Effectiveness of a shell-and-tube heat exchanger with one shell pass and any multiple of two tube passes (two, four, etc., tube passes) UNIVERSITY OF KWAZULU-NATAL, TEST: APRIL 2022 COURSE CODE: ENCH3HE PAGE: 2 of 10 100 80 60 C min IC, =0 max ,0.25- -0.50- 0.75- 1.00