The coefficient of performance (COP) of a refrigerator quantifies its efficiency. For a theoretical Carnot refrigerator (which represents the maximum possible efficiency), the COP is calculated using the absolute temperatures (in Kelvin) of the cold reservoir ($T_C$) and the hot reservoir ($T_H$) as $COP = \frac{T_C}{T_H - T_C}$.
A refrigerator is to maintain eatables kept inside at $9$ $^\circ$C. If room temperature is $36$ $^\circ$C, calculate the coefficient of performance.
Asked in Co operative Supervisor & Environment Supervisor (Group C) Exam 2023 · Topic: Heat and Thermodynamics (Second Law of Thermodynamics (Entropy, Heat Engines, Refrigerators, Carnot Cycle))
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