A power station consists  of  a  four-unit  coal fired power  station,  having  a  combined  capacity  of  2,880  MW. The current efficiency of each unit is around 37.7%. You are asked to improve the thermal efficiency of each unit by lowering the condenser pressure. To simplify this task, assume that each  unit  operates on  a  simple  ideal  Rankine  cycle.  If  the  superheated  vapour  enters  the  turbine at 10 MPa and 500 ֯C and is cooled in the condenser at a lower pressure 10 kPa, determine the quality of the steam at the turbine exit and the thermal efficiency of the cycle for one unit.

Problem 2 Consider a reheat Rankine cycle utilizing steam. Steam leaves the boiler and enters the turbine at 600 psia, 800 °F. After expansion in the turbine to 60 psia, the steam is reheated to 800 °F and then expanded in the low-pressure turbine to 1 psia. After presenting a schematic of the problem in addition to clearly labeled and explained T-s and h-s diagrams, you are asked to determine the following: (a) Pump work required per Ibm of working fluid. Quality of fluid at turbine inlet. (b) (d) (e) (f) Work output of turbine per Ibm of working fluid. Energy input to the boiler per Ibm of working fluid. Heat rejection by the condenser per Ibm of working fluid. Determine the cycle thermal efficiency.

Regenerative Cycle (Open Feedwater Heater):  4. Steam enters the turbine at 10 MPa and 550 °C with mass flow rate of 10 kg/s and is condensed in the condenser at a pressure of 10 KPa. Some Steam is extracted from the turbine at 0.8 MPa and enters in an open feedwater heater. Determine the amount of steam that is condensed in the condenser.5. 23 percent of the steam is extracted from the turbine. The enthalpy and pressure at point 6 is 3100 KJ/KG and 1.26 MPa respectively. Determine the enthalpy of point 2.6. A Steam exits the boiler at 15 MPa and 550 °C and the pressure at point 1 and point 3 is 12 KPa and 1.3 MPa respectively. Determine the Overall Pump work of the cycle if 18 % of the steam is extracted from the turbine.

An ideal RANKINE cycle delivers 210 MW of power. Steam enters the turbine at 10 MPa and500C and is cooled in a condenser at 10 kPaa. Determine the thermal efficiency of this cycleb. Mass flow of waterc. Heat rejected in the condenserd. Work inputted to the pump (remember the volume is constant)