Answer
The measurements are not reasonable.
Work Step by Step
$COP_{R,max}=\dfrac{1}{1-\frac{T_L}{T_H}}$
Given $T_L=-30°C,\ T_H=25°C$
$COP_{R,max}=4.42$
$W_i=2kW\times20min\times60s/min$
$W_i=2400\ kJ$
$COP_R=Q_L/W_i,\quad Q_L=30000\ kJ$
$COP_R=12.5$
$COP_R>COP_{R,max}$: measurements are not reasonable.