(a) Explanation Show the simple Brayton cycle, and with air as the working fluid on T − s diagram. For the given simple Brayton cycle with air as the working fluid, let T i , P i , h i and P r i be the temperature, pressure, specific enthalpy and relative pressure at i t h state respectively. Write the expression of temperature and pressure relation ratio for the compression process 1-2. T 2 s = T 1 ( P 2 P 1 ) ( k − 1 ) / k (I) Here, the specific heat ratio is k . Write the expression of efficiency of the compressor ( η C ) . η C = h 2 s − h 1 h 2 − h 1 η C = c p ( T 2 s − T 1 ) c p ( T 2 − T 1 ) (II) Here, specific heat at constant pressure is c p . Write the expression of temperature and pressure relation ratio for the expansion process 3-4. T 4 s = T 3 ( P 4 P 3 ) ( k − 1 ) / k (III) Write the expression of efficiency of the turbine ( η T ) . η T = h 3 − h 4 h 3 − h 4 s η T = c p ( T 3 − T 4 ) c p ( T 3 − T 4 s ) (IV) Conclusion: Substitute 295 K for T 1 , 10 for P 2 P 1 , and 1 (b) To determine The net work output of the simple Brayton cycle. (c) To determine The thermal efficiency of the cycle.

8th Edition

ISBN: 9781307434316

Author: CENGEL

Publisher: INTER MCG

See similar textbooks

Question

Chapter 9.12, Problem 85P

(a)

To determine

The air temperature at the turbine exit.

(b)

To determine

The net work output of the simple Brayton cycle.

(c)

To determine

The thermal efficiency of the cycle.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Chapter 9.12, Problem 83P

Chapter 9.12, Problem 86P

Students have asked these similar questions

Refrigerant-134a is expanded isentropically from 600 kPa and 70°C at the inlet of a steady-flow turbine to 100 kPa at the outlet. The outlet area is 1 m2, and the inlet area is 0.5 m2. Calculate the inlet and outlet velocities when the mass flow rate is 0.65 kg/s. Use the tables for R-134a. The inlet velocity is m/s. The outlet velocity is m/s.

A container filled with 70 kg of liquid water at 95°C is placed in a 90-m3 room that is initially at 12°C. Thermal equilibrium is established after a while as a result of heat transfer between the water and the air in the room. Assume the room is at the sea level, well sealed, and heavily insulated. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Determine the final equilibrium temperature. Use the table containing the ideal gas specific heats of various common gases. The final equilibrium temperature is °C.

Steam at 100 psia and 650°F is expanded adiabatically in a closed system to 10 psia. Determine the work produced, in Btu/lbm, and the final temperature of steam for an isentropic expansion efficiency of 80 percent. Use steam tables. The work produced is Btu/lbm. The final temperature of steam is °F.

Chapter 9 Solutions

THERMODYNAMICS(SI UNITS,INTL.ED)EBOOK>I

Ch. 9.12 - What are the air-standard assumptions?Ch. 9.12 - What is the difference between air-standard...Ch. 9.12 - How does the thermal efficiency of an ideal cycle,...Ch. 9.12 - What does the area enclosed by the cycle represent...Ch. 9.12 - Prob. 5P Ch. 9.12 - Prob. 6P Ch. 9.12 - Can the mean effective pressure of an automobile...Ch. 9.12 - Prob. 8P Ch. 9.12 - What is the difference between spark-ignition and...Ch. 9.12 - Prob. 10P

Knowledge Booster