Refrigerant-134a enters the evaporator coils placed at the back of the freezer section of a household refrigerator at $120$ $kPa$ with a quality of $20\%$ and leaves at $120$ $kPa$ and $-20^{\circ}C$. If the compressor consumes $420$ $W$ of power and the COP of the refrigerator is $1.25$, determine:
  1. the power consumed by the refrigerator
  2. the mass flow rate of the refrigerant
  3. the change in enthalpy of the refrigerant
  4. the rate of heat rejection

$P=$ $kW$

$\Delta h=$ $kJ/kg$

$\dot{m}=$ $kg/s$

$\dot{Q_H}=$ $kW$

# Pay attention to the unit of each parameter