HKIE Professional Assessment - Energy Discipline Practice Questions - HKIE Professional Assessment - Energy Discipline (Hong Kong Institution Of Engineers) Exam

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In heat transfer analysis for energy efficiency, what is the main advantage of using the Logarithmic Mean Temperature Difference (LMTD) method over a simple arithmetic mean temperature difference?

LMTD accounts for the non-linear variation of temperature difference along the heat exchanger flow length. LMTD allows direct calculation without knowing fluid inlet and outlet temperatures. LMTD eliminates the requirement for heat transfer coefficient determination. LMTD applies only to phase-change boiling heat transfer processes.

Correct Answer:

LMTD accounts for the non-linear variation of temperature difference along the heat exchanger flow length.

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