A regenerative Rankine cycle utilized the schematic of Fig. 5.6. Conditions are as follows: stream 1, 450°C, 3 MPa; stream 2, 250°C, 0.4 MPa; stream 3, 150°C, 0.1 MPa; stream 4, 0.01 MPa; stream 9, 140°C, H = 592 kJ/kg.

(a) Determine the pressures for streams 5, 6, 8, 9, and 10.

(b) Determine ṁ₂/ ṁ₁.

(c) Determine the enthalpies of streams 5 and 6 if the pump is 80% efficient.

(d) Determine the efficiency of turbine stage I.

(e) Determine the output of turbine stage III per kg of stream 4 if the turbine is 80% efficient.

(f) Determine ṁ₂/ ṁ₁. 

(g) Determine the work output of the system per kg of stream 1 circulated.

Transcribed Image Text:

1 Boiler/ Superheater QH 9 A I 2 10 8 A II m 3 6 Pump III 5 4 Qc Condenser 11 Figure 5.6 Schematic for a system with a closed feedwater preheater, A, and an open feedwater preheater, B.