a) Explanation Write the expression to calculate the entropy change during the process 3-4. s 4 − s 3 = − − q o u t , 34 T 0 (I) s 4 − s 3 = c p ln T 4 T 3 − R ln P 4 P 3 Here, in process 3-4 temperature T 4 and T 3 are equal. s 4 − s 3 = c p ln T 4 T 3 ↵ 0 − R ln P 4 P 3 = − R ln P 4 P 3 (II) Here, heat output during the process 3-4 is q o u t , 34 , surrounding temperature is T 0 , temperature at state 4 is T 4 , temperature at state 3 is T 3 , pressure at state 3 is P 3 , pressure at state 4 is P 4 , gas constant is R and the specific heat of air at constant pressure is c p . Conclusion: Substitute 150 kJ / kg for q o u t and 27 ° C for T L in Equation (I) b) To determine The net work output per unit mass of air. c) To determine The thermal efficiency of the cycle

8th Edition

ISBN: 9780100257054

Author: CENGEL

Publisher: YUZU

See similar textbooks

Question

Chapter 9.12, Problem 71P

To determine

The maximum pressure in the cycle.

To determine

The net work output per unit mass of air.

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 70P

Chapter 9.12, Problem 72P

Students have asked these similar questions

A shaft is loaded in bending and torsion such that Ma = 70 N·m, T₁ = 45 N · m, M = 55 N. m, and T = 35 N m. For the shaft, S₁ = 700 MPa and S = 560 MPa, and a fully corrected endurance limit of S₂ = 210 MPa is assumed. Let K = 2.2 and K = 1.8. With a Se design factor of 2.0 determine the minimum acceptable diameter of the shaft using the a) DE- Goodman b) DE-Morrow c) DE-Gerber d) DE-SWT

The feed flow rate to an adiabatic continuous stirred tank reactor (CSTR) in which an exothermicreaction is occurring is increased from 1000 to 1400. kg/h, causing the outlet temperature to change as shown:a) Briefly explain on a physical basis why the temperature in this system oscillates after a step increasein the inlet flow rate. Be clear, complete, and concise. c) You know that this oscillating response cannot be that of two first order processes with real timeconstant acting in series. Assuming the reaction is first order and the CSTR operates with constant holdup,derive the block diagram with all transfer functions indicating how the temperature would respond to the feedflow rate step change (W’(s) as input and T’(s) as output). An intermediate variable in this block diagram willbe the concentration of A in the reactor, represented by CA’(s). d) A correct result for part c) will include a feedback loop in the block diagram, indicating the responsein T to a change in w is not…

Spur gears Note : Exam is open notes &tables / Answer all questions. Q.1. The press shown for Figure.1 has a rated load of 22 kN. The twin screws have double start Acme threads, a diameter of 50 mm, and a pitch of 6 mm. Coefficients of friction are 0.05 for the threads and 0.08 for the collar bearings. Collar diameters are 90 mm. The gears have an efficiency of 95 percent and a speed ratio of 60:1. A slip clutch, on the motor shaft, prevents overloading. The full-load motor speed is 1720 rev/min. (a) When the motor is turned on, how fast will the press head move? (Vm= , Vser. = ) (5M) (b) What should be the horsepower rating of the motor? (TR=, Tc= Pser. = " Bronze bushings Foot Motor Bearings watt, Pm= watt, Pm= h.p.) (20M) 2['s Fig.1 Worm Collar bearing

Chapter 9 Solutions

EBK THERMODYNAMICS: AN ENGINEERING APPR

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