5. A 2- tube pass HX, made of steel tubes (400 tubes, 0.d = 4 cm , t = 10 cm), is used to cool hot oil ( fed at 180 C, comes out at 120 C, C = 2.1 kJ/kg K) Cooling is done by cold water fed at 30 C and comes out at 60 C. The value of U = 400 W/mK, F = 0.82, calculate the max. feed rate of the oil in (ton/d) [12 Mark)