Question Bank • QB_DFE_EXP_060 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Unit Operations in Dairy and Food Engineering

Subtopic: Pasteurization

Question Statement:

In an HTST milk pasteurization plant, raw milk enters the regeneration section at $4^\circ\text{C}$ and leaves regeneration at $65^\circ\text{C}$ after being preheated by pasteurized milk. The pasteurization holding temperature is $72^\circ\text{C}$. Calculate the percentage regeneration efficiency.

Answer Key:

89.71

Step-by-Step Solution & Explanation

Regeneration efficiency: $\eta_{\text{reg}} = \frac{T_{\text{regen}} - T_{\text{feed}}}{T_{\text{pasteur}} - T_{\text{feed}}} \times 100 = \frac{65 - 4}{72 - 4} \times 100 = \frac{61}{68} \times 100 \approx 89.706\%$
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