Question:medium

Saturated steam at 100 \(^\circ\)C condenses on the outside of a tube. Cold fluid enters the tube at 20 \(^\circ\)C and exits at 50 \(^\circ\)C. The value of the Log Mean Temperature Difference (in \(^\circ\)C) is:

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For phase-change heat exchangers (condensers/evaporators), the LMTD is completely identical for both parallel and counter-flow arrangements because the hot or cold fluid temperature remains absolutely flat. As a quick estimation check, the LMTD must always lie between the values of \(\Delta T_1\) and \(\Delta T_2\). Here, \(50 < 63.83 < 80\), verifying that our answer falls within the correct physical bound.

Updated On: Jun 25, 2026

54.89
63.83
72.39
89.36

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The Correct Option is B

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