Problem 8.1 - A 10 MPa Steam Power Plant with an Open Feedwater Heater
Consider the steam power plant with an open feedwater heater operating under the conditions shown in the following diagram:
Carefully draw the complete cycle above on the
pressure-enthalpy [P-h]
diagram provided below, indicating clearly all 9 stations on the
diagram. 
Using
the conditions shown on the diagram above and values obtained from
the Steam
Tables:
a) determine the enthalpy values at all nine stations. Indicate these values on the axis of the P-h diagram above and check them for feasibility.
b) determine the mass fraction [y] of steam bled from the turbine set at station (2).[y = 0.207]
c) determine the thermal efficiency [ηth] of this power plant. (You may neglect the pump work for this evaluation.) [39%]
d) Consider the condition that the throttling valve is completely shut off, and that the state at station (9) is reduced to 10 MPa, 40C. Determine the thermal efficiency [ηth] under this condition.[35%]
Note: Justify all values used and derive all equations used starting from the basic energy equation for a flow system, and basic definition of thermal efficiency of a heat engine. ______________________________________________________________________________________