Answer
a) $COP=2.64$
b) $\dot{Q}_L=1.96\ kW$
Work Step by Step
From tables A-11 to A-13:
Inlet ($P_1=0.8\ MPa, T_1=35°C$): $h_1=271.24\ kJ/kg$
Outlet ($P_2=0.8\ MPa, x_2=0$): $h_2=95.48\ kJ/kg$
The heat rejected (with $\dot{m}=0.018\ kg/s$):
$\dot{Q}_H=\dot{m}(h_1-h_2)$
$\dot{Q}_H=3.164\ kW$
$COP_{HP}=\dot{Q}_H/\dot{W}_i$
Given $\dot{W}_i=1.2\ kW$
$COP=2.64$
$\dot{Q}_H=\dot{W}_i+\dot{Q}_L$
$\dot{Q}_L=1.96\ kW$
