Question Bank • QB_EXP_DFE_HEX_043 MCQ • 1 Mark

Section 7: Dairy and Food Engineering

Heat Exchangers: LMTD & NTU-Effectiveness Methods

Subtopic: Counterflow heat exchanger LMTD calculation

Question Statement:

In the design of sanitary plate heat exchangers for milk processing, counterflow arrangement is preferred over parallel flow primarily because:

Options:

  • (A) It maximizes regeneration efficiency and minimizes required floor space
  • (B) It prevents any turbulent mixing inside plate channels
  • (C) It eliminates the need for gaskets between plates
  • (D) It reduces the milk pressure to atmospheric levels

Answer Key:

A

Step-by-Step Solution & Explanation

Counterflow maximizes the temperature driving force ($LMTD$), enabling up to 90-95% heat regeneration and minimizing surface area/floor space.
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