The LMTD correction factor (FT) is defined as the __________________?
Correct answer: D. Ratio of true temperature difference to the LMTD
- A. Geometric mean of the true temperature difference and the LMTD
- B. Ratio of LMTD to the true temperature difference
- C. Differenced of true temperature difference and the LMTD
- D. Ratio of true temperature difference to the LMTD
Explanation
For multipass or cross-flow exchangers, the actual mean temperature driving force is lower than the ideal countercurrent LMTD. Thus, the correction factor is defined as true mean temperature difference divided by the countercurrent LMTD.
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