ASSIGNMENT

Consider a steam power plant operating on the ideal regenerative Rankine cycle with one open feedwater heater . Steam enters the turbine at 20 MPa and 500°C and is condensed in the condenser at a pressure of 10 kPa. Some steam is extracted from the turbine, at the extraction pressure, and enters the open feedwater heater. Using the EES program :

• Investigate the effect of extraction pressure on the thermal efficiency of the cycle using a pressure range of 2 MPa. .
• Investigate the effect of extraction pressure on the second-law efficiency of the cycle. Heat is supplied to the steam in a furnace maintained at 800 K, and waste heat is rejected to the surroundings at 300 K.
• Determine the energy destruction in the boiler, turbine and feed water heaters? Comment on the results.
• Repeat the same analysis (1 to 3) if the OFWH is replaced by a closed feed water heater

.

Note:

• All thermo-physical properties should be calculated as functions of the state pressure and temperature using the EES library.
• Assumptions, if any, should be mentioned clearly and justified in your report.
• Create parametric tables and plot efficiency versus extraction pressure.
• The report (word format) should include: schematic diagrams , T-s diagrams, thermodynamics analysis of the cycles, results and discussions, and conclusions.