Water and refrigerant R-134a are the working fluids in a binary cycle used for cogeneration of power and process steam. In the steam cycle, superheated vapor enters the turbine with a mass flow rate of 5 kg/s at 4 MPa, 470oC and expands is entropically to 150 kPa. Half of the flow is extracted at 150 kPa and is used for industrial process heating. The rest of the stream passes through a heat exchanger, which serves as the boiler for the refrigerant cycle and the condenser of the steam cycle. The condensate leaves the heat exchanger as saturated liquid at 100 kPa, which is combined with the return flow from the process, at 100 kPa and65oC, before being pumped is entropically to the steam generator pressure. Refrigerant 134a is in an ideal Rankine cycle with refrigerant entering the turbine at 1.5 MPa, 101oC and saturated liquid leaving the condenser at 800 kPa. Determine
The rate of heat transfer to the working fluid passing through the steam generator of the steam cycle,
The net power output of the binary cycle,
The mass flow rate of the refrigerant and
The rate of heat transfer to the industrial process.