A steam power plant operates steadily or an Ideal regenerati

A steam power plant operates steadily or an Ideal regenerative Rankin cycle and w_set, out=1248.7903 kJ/kg. Steam enters the High-P turbine at 15MPa and 550PC degree C and expands to a pressure of 1.6MPa. At this pressure, 20 percent (that is y = 0.2) of the steam is extracted from the High-P turbine and routed to the dosed FWH, while the remainder is reheated to 500 degree C and expanded through the low-P turbine. The steam exits the Low-P turbine at state 8 as a saturated steam. The water at outlet 3 of the closed FWH is saturated liquid. The enthalpy of the steam at state 1 is 356.8248 kJ/kg. Neglect the change in kinetic energy and potential energy. Diagrams are from the thermodynamics textbook by Cengel and Boles. Determine the specific enthalpy of the steam at the inlet of the High-P turbine in kJ/kg. Express your answer to 4 decimal places. When coding your numerical answer on your scantron, leave out the unit.

Solution

solution

here, we want to find the specific enthalpy at the inlet of the high-P turbine.

condition at inlet of high-P turbine is 15 MPa and 550^o C

so,

   from steam table at this temperature and pressure

specific enthalpy = 3450.47 KJ/Kg