A vapor-compression refrigeration system circulates Refrigerant 134a at a rate of 6 kg/min. The refrigerant enters the compressor at -10 °C, 1.4 bar, and exits at 7 bar. The isentropic compressor efficiency is 67%. There are no appreciable pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar, 24 °C. Ignoring heat transfer between the compressor and its surroundings, determine: (a) the rate at which heat energy is removed from the refrigerated space, in kJ/s, (b) the coefficient of performance.