Answer
$\dot{W}_i=0.463\ kW$
Work Step by Step
$COP_R=\dfrac{1}{1-\frac{T_L}{T_H}}$
Given $T_H=35°C,\ T_L=24°C$
$COP_R=27.0$
$COP_R=\dot{Q}_L/\dot{W}_i$
With $\dot{Q}_L=750\ kJ/min$
$\dot{W}_i=0.463\ kW$
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