Oil (cp = 2.1 kJ/(kg K)) is used to heat water in a shell and tubeheat exchanger with a single shell and two tube passes. The overall heat transfer coefficient is 525 W/(m2 K). The mass flow rates are 7 kg/s for the oil and 10 kg/s for the water. The oil and water enter the heat exchanger at 240?C and 20?C, respectively. The heat exchanger is to be designed so that the water leaves the heat exchanger with a minimum temperature of 80?C. Calculate the heat transfer surface area required to achieve this temperature.GIVENOil heats water in a heat exchanger with one shell pass and two tube passesOil specific heat (cpo) = 2.1 kJ/(kg K) = 2100 J/(kg K)Overall heat transfer coefficient (U) = 525 W/(m2 K)Oil mass flow rate (mo) = 7 kg/sWater mass flow rate (mw) = 10 kg/sInlet temperatures: Oil (To,in) = 240? Water (Tw,in) = 20?CMinimum water outlet temperature (Tw,out) = 80?CASSUMPTIONSOil is in thetubes

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Water Twh= 20°C m- 10 kg/s Tah-240°C mw-7 kg/s Tw, out =80°C %3D