4. (12 points) The figure shows the main components of a steadily operating refrigerator using R-134a as a refrigerant. As shown in this figure, R134a enters the condenser at 800

kPa and 35 °C at a rate of 0.5 kg/s,and exits at 800 kPa as a saturated liquid. The compressor consumes 34 kW of mechanical power. (4a). (8p) Determine the rate of heat rejected from the condenser. (4b). (2p) Determine the rate of heat absorption from the cooling compartment to the evaporator. (4c). (2p) Determine the coefficient of performance(COP) of this refrigerator.