In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is _____________ the outlet temperature of the cold fluid?
Correct answer: C. Equal to
- A. Less than
- B. More than
- C. Equal to
- D. Either more or less than (depending upon the fluid)
Explanation
In parallel flow, the hot and cold streams move in the same direction, and the hot-fluid outlet cannot practically fall below the cold-fluid outlet. In the limiting case of infinitely large area, the two outlet temperatures become equal.
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