A modified Rankine cycle using a single feedwater preheater as shown in Fig. 5.7 has the following characteristics.

(a) The inlet to the first turbine is at 500°C and 0.8 MPa.

(b) The feedwater preheater reheats the recirculated water so that stream 7 is 140°C, and steam at 0.4 MPa is withdrawn from the outlet of the first turbine to perform the heating.

(c) The efficiency of each turbine and pump is 79%.

(d) The output of the plant is to be 1 MW.

(e) The output of the second turbine is to be 0.025 MPa. 

Determine the flow rates of streams 1 and 8 and the quality of stream 9 entering the condenser (after the throttle valve). Use the stream numbers from Fig. 5.7 to label streams in your solution.

Transcribed Image Text:

1 Boiler/ Superheater Q 7 I Feedwater Preheater 2 8 6 3 II Condenser Pump 5 4 9 Figure 5.7 Regenerative Rankine cycle for Example 5.3.