Allied & ICAR Exam Bank • ALLIED_1333 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Heat and Mass Transfer in Food Processing

Subtopic: Plate Heat Exchanger Area

Question Statement:

A plate heat exchanger transfers heat at a rate $Q = 100\text{ kW}$ with an overall heat transfer coefficient $U = 2000\text{ W/(m}^2\cdot\text{K)}$ and $LMTD = 10.0\text{ K}$. Using $Q = U A \Delta T_m$, the required effective heat transfer area $A$ in m$^2$ is:

Answer Key:

5.0

Step-by-Step Solution & Explanation

$A = \frac{Q}{U \times LMTD} = \frac{100,000\text{ W}}{2000\text{ W/(m}^2\cdot\text{K)} \times 10.0\text{ K}} = \frac{100,000}{20,000} = 5.0\text{ m}^2$.
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