4 1 pt heating of a product in parallel flow or counterflow heat excha
4. (1 pt) Heating of a Product in Parallel Flow or Counterflow Heat Exchanger: NTU Method
Consider a concentric-tube heat exchanger that is 3 m in length. The inside diameter of the inner tube is
0.01 m and the inside diameter of the outer tube is 0.02 m. The wall thickness of the inner tube can be
neglected. A fluid enters the inner tube at 10 °C and flows at an average velocity of 0.3 m/s. Water enters
the annular region between the tubes at 50 °C and flows at an average velocity of 0.1 m/s. The overall heat-
transfer coefficient is 350 W/m²-K. Properties of the fluid: p = 1300 kg/m³, c = 2500 J/kgK. Properties
of water: p = 1000 kg/m³, c = 4200 J/kgK. Using the NTU method, determine the temperature of the
fluid exiting the tube if:
A. It is a counterflow heat exchanger.
B. It is a parallel-flow heat exchanger.
C. Which type of heat exchanger provides a higher heat-transfer rate and by what %?
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