Cold water (cp = 4180 J. kg-1 C^-1) enters the tubes of a heat exchanger with 2 shell passes and 12 tube passes at 14 C with a mass rate of 3 kg/s, while hot oil (cp =2200 J. kg^-1 C^-1) enters the hull at 200 C with the same mass flow rate. The overall heat transfer coefficient based on the outer surface of the tube is 300 W. m^-2.C-¹ and the heat transfer surface with respect to the outer diameter is 20m². Assume that the currents of the fluids are countercurrent. Determine the heat transfer rate using: Using the LMTD method and Using the -NTU method.