Consider a Carnot-cycle refrigerator with ammonia as the working fluid. Heat is rejected from the ammonia at 20 deg C during which process the ammonia changes from saturated vapor to saturated liquid. Heat is transferred to the ammonia at 0 deg C. Assume a mass flow rate of 0.02 kg/s. Show the cycle on a T-s diagram.
Determine:
a) The quality of the ammonia at the beginning and end of the isothermal heat addition process at 0 deg C (Answer: x1=0.947,x4=0.0713)
b) The rate of heat addition (Answer: 22kJ/s)
c) The rate of heat rejection
d) The coeficient of performance for the cycle (Answer: 13.66)
e) The power input in kJ/s