Repeat Prob. 10–98 assuming both the pump and the turbine are isentropic.
10–98 Consider a steam power plant that operates on a regenerative Rankine cycle and has a net power output of 150 MW. Steam enters the turbine at 10 MPa and 500°C and the condenser at 10 kPa. The isentropic efficiency of the turbine is 80 percent, and that of the pumps is 95 percent. Steam is extracted from the turbine at 0.5 MPa to heat the feedwater in an open feedwater heater. Water leaves the feedwater heater as a saturated liquid. Show the cycle on a T-s diagram, and determine (a) the mass flow rate of steam through the boiler and (b) the thermal efficiency of the cycle. Also, determine the exergy destruction associated with the regeneration process. Assume a source temperature of 1300 K and a sink temperature of 303 K.
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Thermodynamics: An Engineering Approach
- Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the specific enthalpy (kJ/kg) at the boiler outlet. (Use 2 decimal places for the final answer.)arrow_forwardConsider a steam power plant operating on a simple ideal Rankine cycle. Steam enters the turbine at 15 MPa and 650°C and is condensed in the condenser at a pressure of 15 kPa. Determine the Wnet (kJ/kg). (Use 2 decimal places for the final answer.)arrow_forwardConsider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual Qout (kJ/kg). (Use 2 decimal places for the final answer.)arrow_forward
- Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Determine the mass flow rate of the stream (kg/s). (Use 2 decimal places for the final answer.)arrow_forwardConsider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual Wp (kJ/kg). (Use 2 decimal places for the final answer.)arrow_forwardConsider a steam power plant operating on a simple Rankine cycle. Steam enters the turbine at 15 MPa and 650°C and is condensed in the condenser at a pressure of 15 kPa. Assuming an isentropic efficiency of 84% and 86% for the pump and turbine, respectively, determine the actual Qout (kJ/kg). (Use 2 decimal places for the final answer.)arrow_forward
- Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the quality ofthe steam at the turbine exit, the thermal efficiency of the cycle, specific enthalpy (kJ/kg) at the condenser, and actual Qin (kJ/kg).arrow_forwardConsider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual mass flow rate (kg/s) of the steam. (Use 2 decimal places for the final answer.)arrow_forwardConsider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Assuming an isentropic efficiency of 85 percent for both the turbine and the pump, determine the actual specific enthalpy (kJ/kg) at the boiler inlet. (Use 2 decimal places for the final answer.)arrow_forward
- Consider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Determine the Wnet (kJ/kg). (Use 2 decimal places for the final answer.)arrow_forwardConsider a 210-MW steam power plant that operates on a simple ideal Rankine cycle. Steam enters the turbine at 10 MPa and 500C and is cooled in the condenser at a pressure of 10 kPa. Determine the quality of the steam (%) at the turbine exit. (Use 2 decimal places for the final answer.)arrow_forwardConsider a 150-MW steam power plant that operates on a simple Rankine cycle. Steam enters the turbine at 7 MPa and 500°C and is cooled in the condenser at 10 kPa. Calculate the mass flow rate of steam produced by the boiler. Assume an isentropic efficiency of 87% for both the turbine and the pump.arrow_forward
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