The inlet temperatures for a double-pipe heat exchanger contains water are 35 °C and 200 °C. If their flow rates are 84 kg/h (cold) and 42 kg/h (hot), then; a) Draw the schematic diagrams of counter flow and parallel flow operated for this heat exchanger. b) Evaluate the maximum rate of heat transfer. c) Evaluate the temperatures of water at the outlet of heat exchanger. If it is counterflow, the heat transfer area of heat exchanger and overall heat transfer coefficient are 0.33 m² and 180 W/m².K, respectively.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter10: Heat Exchangers
Section: Chapter Questions
Problem 10.18P
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The inlet temperatures for a double-pipe heat exchanger contains water are 35 °C and 200 °C. If
their flow rates are 84 kg/h (cold) and 42 kg/h (hot), then;
a) Draw the schematic diagrams of counter flow and parallel flow operated for this heat
exchanger.
b) Evaluate the maximum rate of heat transfer.
c) Evaluate the temperatures of water at the outlet of heat exchanger. If it is counterflow, the
heat transfer area of heat exchanger and overall heat transfer coefficient are 0.33 m² and
180 W/m².K, respectively.
d) Determine the maximum rate of heat transfer for a parallel heat exchanger with same inlet
condition. Assume the heat exchanger is very long.
e) Find the effectiveness of the heat exchanger of part (c).
Transcribed Image Text:The inlet temperatures for a double-pipe heat exchanger contains water are 35 °C and 200 °C. If their flow rates are 84 kg/h (cold) and 42 kg/h (hot), then; a) Draw the schematic diagrams of counter flow and parallel flow operated for this heat exchanger. b) Evaluate the maximum rate of heat transfer. c) Evaluate the temperatures of water at the outlet of heat exchanger. If it is counterflow, the heat transfer area of heat exchanger and overall heat transfer coefficient are 0.33 m² and 180 W/m².K, respectively. d) Determine the maximum rate of heat transfer for a parallel heat exchanger with same inlet condition. Assume the heat exchanger is very long. e) Find the effectiveness of the heat exchanger of part (c).
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