Heat exchanger ( shell-and-tube) is being designed to heat water from Temp of water inlet =20°C to T of water outlet= 90°C by passing hot oil at Temp of oil inlet= 160 °C through the shell side of the exchanger. Water flows through a 0.03 m Diamter thin wall tube; mass flow rate of m= 3 kg/s. 8 tube passes and a single shell pass is the design. average specific heats of oil and water inside this device are c_oil=2350 J/kg-K and c_water=4180 J/kg-K 1) The oil has to leave the exchanger at a temperature of at least 100 °C. What's the required mass flow rate of the oil? 2) Find the effectiveness of the exchanger? 3) Find the REQUIRED NTU 4) The average convection coefficient between the oil and the outside of the tube is found to be h = 500 W/m2-K, while the average convection coefficient between the water and the inside of the tube is found to be h = 2500 W/m2-K. Using this information and the NTU value, determine the tube length per pass needed to achieve the desired heating of the water. Assume) conduction thermal resistance is negligible for a thin-walled tube. Outer and inner surface areas of the tube that are in contact with the water and the oil, respectively, are approximately the same (Aw = Ao)

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.39P

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Heat exchanger ( shell-and-tube) is being designed to heat water from Temp of water inlet =20°C to T of water outlet= 90°C by passing hot oil at Temp of oil inlet= 160 °C through the shell side of the exchanger. Water flows through a 0.03 m Diamter thin wall tube; mass flow rate of m= 3 kg/s. 8 tube passes and a single shell pass is the design. average specific heats of oil and water inside this device are c_oil=2350 J/kg-K and c_water=4180 J/kg-K

1) The oil has to leave the exchanger at a temperature of at least 100 °C. What's the required mass flow rate of the oil?

2) Find the effectiveness of the exchanger?

3) Find the REQUIRED NTU

4) The average convection coefficient between the oil and the outside of the tube is found to be h = 500 W/m2-K, while the average convection coefficient between the water and the inside of the tube is found to be h = 2500 W/m2-K. Using this information and the NTU value, determine the tube length per pass needed to achieve the desired heating of the water.

Assume) conduction thermal resistance is negligible for a thin-walled tube.

Outer and inner surface areas of the tube that are in contact with the water and the oil, respectively, are approximately the same (Aw = Ao)

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