Assume a variation of the cycle in Problem 9.49 with a closed FWH at 0.8 MPa and one open FWH at 100 kPa. A pump is used to bring the water leaving the condenser up to 100 kPa for an open FWH,and a secondpumpbrings the feedwater up to 3.0 MPa, as shown in Fig. P9.60. Condensate from the closed FWH is drained through a trap to the open FWH. Calculate the thermal efficiency of the cycle and the specific net work.

Data from Problem 9.49

Consider an ideal steam regenerative cycle in which steam enters the turbine at 3.0 MPa, 400◦C and exhausts to the condenser at 10 kPa. Steam is extracted from the turbine at 0.8 MPa for an open FWH. The feedwater leaves the heater as saturated liquid. The appropriate pumps are used for the water leaving the condenser and the FWH. Calculate the thermal efficiency of the cycle and the specific net work.

Transcribed Image Text:

Boiler Turbine Closed FWH 5 7 100kPa 7a 6 Condenser P2 3 Open FWH Trap P1 1 7c FIGURE P9.60 2.