1. Write the analysis (continuity and energy equations) for the closed FWH with a drip pump, as shown in Fig. 9.13. Assume that the control volume has state 4 out, so it includes the drip pump. Find the equation for the extraction fraction.
2. A closed FWH in a regenerative steam power cycle heats 20 kg/s of water from 100?C, 20 MPa to 200?C, 20 MPa. The extraction steam from the turbine enters the heater at 4 MPa, 275?C and leaves as saturated liquid. What is the required mass flow rate of the extraction steam?