An ideal vapor compression refrigeration cycle with ammonia as the working fluid has an evaporator temperature of -20°c and a condenser pressure of 12 bar. saturated vapor enters the compressor and saturated liquid exits the condenser. the mass flow rate of the refrigerant is 3 kg/min. determine (a) the coefficient of performance. (by) the refrigerating capacity, in tons. to determine the effect of changing the evaporator temperature on the cycle performance, plot the coefficient of performance and the refrigerating capacity, in tons, for saturated vapor entering the compressor at temperatures ranging from -40 to -10° c.