Water at 25 C with a mass flow rate of 6 kg/s is available to cool...

 

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Water at 25 C with a mass flow rate of 6 kg/s is available to cool hot oil from 80 C to 20 C. The oil mass flow rate is 2 kg/s. A shell-and-tube heat exchanger with one-shell pass and four tube-passes is proposed for this process. Using uniform Cp values of 2.5 kJ/(kg C) and 4.2 kJ/(kg C) for oil and water, respectively, and assuming an overall heat transfer coefficient of 260 W/(m2 C) for the heat exchanger: a) determine the surface area of the heat exchanger b) plot the heat exchanger surface area as a function of water mass flow rate, when the mass flow rates vary between 8 and 30 kg/s. Water at 25 C with a mass flow rate of 6 kg/s is available to cool hot oil from 80 C to 20 C. The oil mass flow rate is 2 kg/s. A shell-and-tube heat exchanger with one-shell pass and four tube-passes is proposed for this process. Using uniform Cp values of 2.5 kJ/(kg C) and 4.2 kJ/(kg C) for oil and water, respectively, and assuming an overall heat transfer coefficient of 260 W/(m2 C) for the heat exchanger: a) determine the surface area of the heat exchanger b) plot the heat exchanger surface area as a function of water mass flow rate, when the mass flow rates vary between 8 and 30 kg/s.