A type 2-4 shell and tube heat exchanger (two pass through the shell and four passages through the tubes) with an internal diameter of the shell 489 mm and that it is formed by 204 tubes of in OD, 16 BWG with a length of 4.9 m distributed in a 25.4 mm square array and supported by cut-out baffles of 25% spaced every 127 mm. 4.17 kg/s of n-butyl alcohol are cooled from 100C up to 40C through a stream of water which enters the exchanger at 35C and leaves at 45C. If the maximum allowable pressure drops are 70 kPa on both sides. Determine

a) what is the fouling factor

b) Is this interchange suitable for the proposed service?