An ideal vapour-compression refrigerator operates between −20 °C and 40 °C; the refrigerant enters the condenser as saturated vapour and leaves as saturated liquid. At −20 °C: h_{f} = 20, h_{g} = 180 kJ/kg, s_{f} = 0.07, s_{g} = 0.7366 kJ/kg·K; at 40 °C: h_{f} = 80, h_{g} = 200 kJ/kg, s_{f} = 0.3, s_{g} = 0.67 kJ/kg·K. For 0.025 kg/s find the refrigeration effect (in kW) and the COP.