Question Bank • QB_EXP_DFE_HEX_016 MSQ • 2 Marks

Section 7: Dairy and Food Engineering

Heat Exchangers: LMTD & NTU-Effectiveness Methods

Subtopic: Counterflow heat exchanger LMTD calculation

Question Statement:

Referring to the counterflow heat exchanger temperature profile diagram, which of the following statements is/are correct?

Options:

  • (A) The exit temperature of the cold fluid can exceed the exit temperature of the hot fluid
  • (B) For given inlet and outlet temperatures, LMTD for counterflow is always greater than or equal to that for parallel flow
  • (C) For a specified heat duty, counterflow requires less surface area than parallel flow
  • (D) The effectiveness can reach 1.0 in counterflow as NTU approaches infinity

Answer Key:

A, B, C, D

Step-by-Step Solution & Explanation

All four statements are fundamental thermodynamic advantages of counterflow heat exchangers.
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