Problem 2) [25 pts] Oil (C^p=2.1kJ/kgK) is used to heat water in a tube-and-shell heat exchanger with a single shell pass and two tube passes. The overall heat transfer coefficient is 525W/m2K. The mass flow rates are 7kg/s for the oil and 10kg/s for the water. The oil and water enter the heat exchanger at 240C and 20C, respectively. The heat exchanger is to be designed so that the water leaves the heat exchanger with a minimum temperature of 80C. Calculate the heat transfer surface area required to achieve this temperature