3. (i) The working fluid, R-134a, in a car refrigeration system enters the compressor as saturated vapor at 10C and exits the condenser as saturated liquid at 900kPa. The actual compressor exit temperature is 60C. Calculate the cycle COP and the compressor isentropic efficiency. (ii) A household refrigerator using R-134a is to keep the air inside the fridge at 0C when the outside kitchen air is at 25C. Assuming a temperature difference of 10C between the refrigerant and the air for effective heat transfer, determine the evaporator and condenser pressures (in kPa ). Also, calculate the maximum coefficient of performance of a cycle operating between the same saturation temperature limits of the working fluid. 3. (i) The working fluid, R-134a, in a car refrigeration system enters the compressor as saturated vapor at 10C and exits the condenser as saturated liquid at 900kPa. The actual compressor exit temperature is 60C. Calculate the cycle COP and the compressor isentropic efficiency. (ii) A household refrigerator using R-134a is to keep the air inside the fridge at 0C when the outside kitchen air is at 25C. Assuming a temperature difference of 10C between the refrigerant and the air for effective heat transfer, determine the evaporator and condenser pressures (in kPa ). Also, calculate the maximum coefficient of performance of a cycle operating between the same saturation temperature limits of the working fluid