Question Bank • QB_DFE_003 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Preservation of Food

Subtopic: Refrigeration and cold storage basics and applications

Question Statement:

A milk chilling refrigeration plant operates on a vapour compression refrigeration cycle with a cooling capacity of $10\text{ TR}$ ($1\text{ TR} = 3.5\text{ kW}$). If the electrical power input to the compressor is $7.0\text{ kW}$, the Coefficient of Performance (COP) of the refrigeration unit is ________ (answer in integer).

Answer Key:

5

Step-by-Step Solution & Explanation

1. Cooling capacity $Q_c$: $Q_c = 10\text{ TR} \times 3.5\text{ kW/TR} = 35.0\text{ kW}$ 2. Power input $W = 7.0\text{ kW}$ 3. Coefficient of Performance ($COP$): $COP = \frac{\text{Refrigeration Effect}}{\text{Work Input}} = \frac{Q_c}{W} = \frac{35.0}{7.0} = 5$
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