7. The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 12. Air enters the compressor at 310 K and the turbine at 1400 K. The combustion gases leaving the gas turbine are used to heat the steam at 12.5 MPa to 500 °C in a heat exchanger. The combustion gases leave the heat exchanger at 247 °C. Steam expands in a high-pressure turbine to a pressure of 2.5 MPa and is reheated in the combustion chamber to 550 °C before it expands in a low-pressure turbine to 10 kPa. The mass flow rate of steam is 12 kg/s. Assuming all the compression and expansion processes to be isentropic, determine 154 kJ/s 1.44 105 kJ/s [50.1% (a) the mass flow rate of air in the gas-turbine cycle, (b) the rate of total heat input, and (c) the thermal efficiency of the combined cycle 8. Repeat previous problem assuming isentropic efficiencies of 100 % for the pump, 85 % for the compressor, and 90 % for the gas and steam turbines

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
icon
Related questions
Question

Please solve Q8

 

7. The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 12. Air enters
the compressor at 310 K and the turbine at 1400 K. The combustion gases leaving the gas turbine
are used to heat the steam at 12.5 MPa to 500 °C in a heat exchanger. The combustion gases leave
the heat exchanger at 247 °C. Steam expands in a high-pressure turbine to a pressure of 2.5 MPa
and is reheated in the combustion chamber to 550 °C before it expands in a low-pressure turbine
to 10 kPa. The mass flow rate of steam is 12 kg/s. Assuming all the compression and expansion
processes to be isentropic, determine
154 kJ/s
1.44 105 kJ/s
[50.1%
(a) the mass flow rate of air in the gas-turbine cycle,
(b) the rate of total heat input, and
(c) the thermal efficiency of the combined cycle
8. Repeat previous problem assuming isentropic efficiencies of 100 % for the pump, 85 % for the
compressor, and 90 % for the gas and steam turbines
Transcribed Image Text:7. The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 12. Air enters the compressor at 310 K and the turbine at 1400 K. The combustion gases leaving the gas turbine are used to heat the steam at 12.5 MPa to 500 °C in a heat exchanger. The combustion gases leave the heat exchanger at 247 °C. Steam expands in a high-pressure turbine to a pressure of 2.5 MPa and is reheated in the combustion chamber to 550 °C before it expands in a low-pressure turbine to 10 kPa. The mass flow rate of steam is 12 kg/s. Assuming all the compression and expansion processes to be isentropic, determine 154 kJ/s 1.44 105 kJ/s [50.1% (a) the mass flow rate of air in the gas-turbine cycle, (b) the rate of total heat input, and (c) the thermal efficiency of the combined cycle 8. Repeat previous problem assuming isentropic efficiencies of 100 % for the pump, 85 % for the compressor, and 90 % for the gas and steam turbines
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 10 steps with 10 images

Blurred answer
Knowledge Booster
Free Body Diagram
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY