A turbine receives 8 kg/s of air at 9 MPa, 677 C and 60 m/s (pressure, temperature and velocity). It discharges the air at a temperature of 77 C and a velocity of 15 m/s. In addition, there is heat transfer from the turbine to the surroundings for 150 kW. Find the power produced by the turbine in kW and its isentropic efficiency. You may use specific heats at the average temperature.

A turbine receives 8 kg/s of air at 9 MPa, 677 C and 60 m/s (pressure, temperature and velocity). It discharges the air at a temperature of 77 C and a velocity of 15 m/s. In addition, there is heat transfer from the turbine to the surroundings for 150 kW. Find the power produced by the turbine in kW and its isentropic efficiency. You may use specific heats at the average temperature.

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

Water vapor enters an adiabatic turbine at a pressure of 8 MPa, a temperature of 600 ℃ and a speed of 100 m/s, and then a pressure of 50 kPa exits at a temperature of 150 ℃ and a speed of 160 m/s. The turbine power is 10 MW. According to this; a) The steam flow rate from the turbine b) Do you find the isanthropic efficiency of the turbine?
Steam is expanded isentropically in a turbine from 800 kPa, 250 °C to 200 kPa. How much work is done in this process per kg of water?
Steam to a turbine at a mass flow rate of 1.4 kg/s, 700 kPa pressure and 400 °C enters the temperature. Steam at 100 kPa pressure and 1.4 m3/kg specific volume exits the turbine. Heat transfer from turbine to environment 50 kW, with turbine Since the boundary temperature between the environment is 70 °C, a) Find the power produced by the turbine, entropy produced in the turbine and isentropic efficiency of the turbine. Note: The changes in kinetic and potential energies will be neglected and T (K) = 273 + °C will be taken.
The power required for the compressor, to handle air adiabatically from 101.325kPaa and 300 °K to 305 kPaa, 2550 Hp. The inlet velocity is 21 m/s and the dischargevelocity of air is 85 m/s. a) If the process is isentropic, find the volume of air handles,in lps, measured at inlet conditions. b) If the compression is irreversible adiabatic totemperature 157.5 °C, with the capacity obtained in a), find the power input.
2.) Water vapor enters a turbine with a mass flow of 2kg / s, 6 MPa pressure, 500 ° C temperature and 40 m / s velocity and exits at 300 kPa pressure, 200 ° C and 100 m / s velocity. 200 W heat transfer is made to the environment from the turbine with a surface temperature of 150 ° C. Note: Take T (K) = 273.15 + ◦C and ambient temperature 25◦C. a) Find the power of the turbine, kW. b) Find the amount of entropy produced in the turbine, kW / K. c) Find the exergy of the turbine at the output conditions, in kW. d) Find the second-law efficiency (exergy efficiency) of the turbine. e) Find the exergy (kW) destroyed in the turbine.
The power of a steam turbine in a thermal power plant is 60 MW. Water vapor enters the turbine at 3MPa pressure, 4000C temperature and 50 m / s speed, 10 kPa pressure, 0.9 dry degree and 200 m / s speed leaves the turbine. Considering the turbine as adiabatic; 1-Find the mass flow of steam 2-Find the turbine outlet cross-sectional area, its ratio (A2 / A1) to the inlet cross-sectional area.
Professor Modyn feeds superheated steam at 1.00 MPa1.00 MPa and 350 ∘C350 ∘C into an adiabatic reversible turbine. The water exits at 800.0 kPa.800.0 kPa. Neglect changes in kinetic and potential energy. What is the exit temperature? Calculate the work for the turbine.
Water vapor enters a turbine with a mass flow of 2kg / h, 6 MPa pressure, 500 ° C temperature and 40 m / s velocity and exits with 300 kPa pressure, 200 ° C and 100 m / s velocity. 200 W heat transfer is made to the environment from the turbine with a surface temperature of 150 ° C.Note: Take T (K) = 273.15 + ◦C and ambient temperature 25◦C.a) Find the power of the turbine, (kW).b) Find the amount of entropy produced in the turbine, (kW / K).c) Find the exergy (kW) of the turbine at the exit conditions.d) Find the second-law efficiency (exergy efficiency) of the turbine.e) Find the exergy (kW) destroyed in the turbine.
Air enters a turbine at 900K and leaves at 300K. The turbine shaft is connected to a generator with an efficiency of 80%. If the mass flow rate of air through the turbine is 150kg/s, what is the electrical power produced by this turbine generator?
Problem 4: In the pump of a steam power plant, saturated liquid at 75 kPa pressure is compressed to 3 MPa pressure. Since the adiabatic efficiency of the pump is 85%, find the work consumed by the pump.
Air flowing at 0.5 m3/min enters a compressor at 101 kPa and 25°C. The air exits at 600 kPa and 300°C. During this process, 250 W of heat are lost to the environment. What is the required power input?
A Camot engine uses air and operates between temperature limits of 7400F and 400F. The pressure at state 1 is 200 psia, and the specific volume doubles during the heat addition process. Determine the net work per unit mass.