Answer
$\dot{W}_i=0.623\ kW$
Work Step by Step
$COP_R=\dfrac{1}{1-\frac{T_L}{T_H}}$
Given $T_H=25°C,\ T_L=-8°C$
$COP_R=8.03$
$COP_R=\dot{Q}_L/\dot{W}_i$
With $\dot{Q}_L=300\ kJ/min$
$\dot{W}_i=0.623\ kW$
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