Refrigerant-134a is the working fluid in a vapor-compression refrigeration system with two evaporators. The system uses only one compressor. Saturated liquid leaves the condenser at 11 bar, one part of the liquid is throttled to 3 bar, the second part is throttled to the second evaporator at a temperature of -15oC. Vapor leaves the first evaporator as saturated vapor and is throttled to the pressure of the second evaporator. The refrigerating capacity in the first evaporator is 1 ton, in the second is 2 tons. All processes of the working fluid are internally reversible, except for the expansion through each valve. The compressor and valves operate adiabatically. Kinetic and potential energy effects are negligible. Determine (a) The mass flow rates through each evaporator,
(b) The compressor power input,
(c) The heat transfer from the refrigerant passing through the condenser.