Refrigeration Cycles, Refrigerants & Cold Storage Design

The theoretical maximum COP of a Carnot refrigeration cycle operating between an evaporator temperature $T_L$ and a condenser temperature $T_H$ (in Kelvin) is given by:

Options:

• (A) $COP_{\text{Carnot}} = \frac{T_L}{T_H - T_L}$
• (B) $COP_{\text{Carnot}} = \frac{T_H - T_L}{T_L}$
• (C) $COP_{\text{Carnot}} = \frac{T_H}{T_H - T_L}$
• (D) $COP_{\text{Carnot}} = \frac{T_L}{T_H}$