Question Bank • QB_SUB_DFE_CYC_001 NAT • 2 Marks

Section 7: Dairy and Food Engineering

Refrigeration Cycles, Refrigerants & Cold Storage Design

Subtopic: Carnot COP upper bound

Question Statement:

An ideal Carnot refrigerator operates between an evaporator temperature of $-23^\circ\text{C}$ ($250\text{ K}$) and a condenser temperature of $27^\circ\text{C}$ ($300\text{ K}$). The theoretical maximum COP of the refrigerator is:

Answer Key:

5.0

Step-by-Step Solution & Explanation

$\text{COP}_{\text{Carnot}} = \frac{T_L}{T_H - T_L} = \frac{250}{300 - 250} = \frac{250}{50} = 5.00$
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