Water is the working fluid in a Carnot vapor power cycle. Saturated liquid enters the boiler at a pressure of 10 MPa, and saturated vapor enters the turbine. The condenser pressure is 8 kPa. The effects of irreversibilities in the adiabatic expansion and the compression processes are taken into consideration. The turbine and pump efficiencies are 80% and 75%, respectively. Determine (a) the thermal efficiency, (b) the back work ratio, (c) the heat transfer to the working fluid per unit mass passing through the boiler in kJ/kg and (d) the heat transfer from the working fluid per unit mass passing through the condenser in kJ/kg.

Water is the working fluid in a Carnot vapor power cycle. Saturated liquid enters the boiler at a pressure of 10 MPa, and saturated vapor enters the turbine. The condenser pressure is 8 kPa. The effects of irreversibilities in the adiabatic expansion and the compression processes are taken into consideration. The turbine and pump efficiencies are 80% and 75%, respectively. Determine (a) the thermal efficiency, (b) the back work ratio, (c) the heat transfer to the working fluid per unit mass passing through the boiler in kJ/kg and (d) the heat transfer from the working fluid per unit mass passing through the condenser in kJ/kg.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Need help with this engineering problem.
A simple power plant utilizing the Rankine Cycle operates with an inlet boiler pressure of 5 MPa and an inlet condenser pressure of 300 kPa. Because of frictional effects, the pressure of the water drops 0.3 MPa in the boiler and 3 kPa in the condenser. The temperature of the steam as it enters the turbine is 700 °C. The adiabatic efficiency of the pump and of the turbine are 83 percent and 88 percent, respectively. The pump and the turbine are adiabatic, and the water enters the pump as saturated liquid. It can be assumed that heat transfer to the water in the boiler is from a reservoir at 1500 K, and the environment is at 25 °C. Determine the thermal efficiency of the cycle and compare it with the thermal efficiency of (a) a Carnot cycle, and (b) the ideal Rankine Cycle. Specify the amount of entropy generated in each step of the real cycle.
2. A Rankine cycle is characterized by turbine inlet conditions of 10 MPa and 500°C. The condenser pressure is 6 kPa. The heat transfer to the steam in the boiler occurs at the rate of 7.0 X 100 kW. The cooling water in the condenser increases in temperature from 20⁰ to 30°C. Determine (a) the net power produced; (b) the cooling-water flow rate in kg/s; (c) the cycle thermal efficiency.
Compare the thermal efficiency of a two-stage gas turbine with regeneration, reheating, and intercooling to that of a three-stage gas turbine with the same equipment when the maximum cycle temperature is 800°C.
Problem: Water is used as the working fluid in an ideal Rankine cycle. Saturated liquid enters the pump with a specific volume of 1.2720 X 10-3m3/Kg and exits (the pump) at 1.7530 X 10-3 m3/Kg and a temperature of 380°C.The internal energy at the exit of the turbine is 2,500KJ/Kg. Determine:1. The network produced in KJ/Kg2. The heat transfer to the steam in the steam generator in KJ/Kg3. The thermal efficiency4. The heat transfer to cooling water passing through the condenser in KJ/Kg of steam condensed.
Determine the thermal efficiency
A simple Rankine cycle uses water as the working fluid. The boiler operates at 6400 kPa and the condenser at 70 kPa. At the entrance to the turbine, the temperature is 490 °C. The isentropic efficiency of the turbine is 84 %, pressure and pump losses are negligible, and the water leaving the condenser is subcooled by 6.7 °C. The boiler is sized for a mass flow rate of 18 kg/s. Determine the following values. (1) The temperature at the pump inlet. / 80.3 (2) The specific volume at the pump inlet. (3) The specific enthalpy at the turbine exit. X 346 (4) The rate at which heat is added in the boiler. (5) The power required to operate the pumps. (6) The net power produced by the cycle. (7) The thermal efficiency. o °C O m/kg O kJ/kg O kW O kW O kW 0.001030
Consider a steam power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 8000 kPa, the reheat section at 1000 kPa, and the condenser at 20 kPa. The mixture quality at the exit of both turbines is 90 percent. Determine (a) the temperature at the inlet of each turbine, (b) the cycle's thermal efficiency, efficiency of this cycle. Assume a source temperature of 1500 K and a sink temperature of 295 K. (d) the second-law
Consider an ideal Rankine cycle. Water exits the condenser at a pressure of 0.08 bar and a flow rate of 30 kg/s. Saturated steam exits the boiler at a pressure of 150 bar. Determine: (a) the net power developed by the power plant, in kW. (b) the rate of heat transfer in the boiler, in kW. (c) the thermal efficiency of the cycle.
A Rankine Cycle operates at a throttle pressure and temperature of 5 MPa and 450°C, respectively. The generator produces 20 MW at an efficiency of 95% while the mechanical efficiency is 97%. The actual expansion efficiency of the turbine is 85% and the pressure of the condenser is 10 kPa. Determine the ideal engine heat rate in kJ/kWh.
Q2-Consider a Carnot heat-engine cycle executed in a steady-flow system using steam as the working fluid. The cycle has a thermal efficiency of 30 percent, and steam changes from saturated liquid to saturated vapor at 275°C during the heat addition process. If the mass flow rate of the steam is 3 kg/s, determine the net power output of this engine