In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is_________________?
Correct answer: C. Zero
- A. Minimum
- B. Maximum
- C. Zero
- D. Infinity
Explanation
For parallel flow, equal hot- and cold-stream outlet temperatures make the terminal temperature difference zero. The LMTD therefore becomes zero in the limiting case, indicating no finite driving force at that end.
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