Consider a water-to-water double-pipe heat exchanger whose flow arrangement is not known. The temperature measurements indicate that the cold water enters at 20°C and leaves at 50°C, while the hot water enters at 80°C and leaves at 45°C. Do you think this is a parallel-flow or counter-flow heat exchanger? Explain.

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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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.54P
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Consider a water-to-water double-pipe heat exchanger
whose flow arrangement is not known. The temperature measurements
indicate that the cold water enters at 20°C and
leaves at 50°C, while the hot water enters at 80°C and leaves
at 45°C. Do you think this is a parallel-flow or counter-flow
heat exchanger? Explain.

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