kJ Air (Rair = 0.287 ) as an ideal gas flows through the turbine and heat exchanger arrangement kg-K) shown below. Steady-state data are given on the figure. Stray heat transfer and kinetic and potential energy effects can be ignored. Sketch a T – s diagram of processes 1-4 and determine: (a) The entropy production of turbine 1 [3.2 kW /K] (b) The isentropic efficiency of turbine 1 [75%] (c) The exit temperature of turbine 2 if its isentropic efficiency is 77, = 0.85 [960 K] (d) The entropy production within the intermediate heat exchanger [3.2 kW /K] Wn = 10,000 kW Wn =? Turbine Turbine P3= 4.5 bar T3 = ? T = 1100 K P2=5 bar P4 =1 bar Air 2 3 T, = 1400 K Pi = 20 bar www Ts = 1480 K -5 Ps 1.35 bar ms = 1200 kg/min Heat exchanger V T = 1200 K P6 = 1 bar Air in

kJ Air (Rair = 0.287 ) as an ideal gas flows through the turbine and heat exchanger arrangement kg-K) shown below. Steady-state data are given on the figure. Stray heat transfer and kinetic and potential energy effects can be ignored. Sketch a T – s diagram of processes 1-4 and determine: (a) The entropy production of turbine 1 [3.2 kW /K] (b) The isentropic efficiency of turbine 1 [75%] (c) The exit temperature of turbine 2 if its isentropic efficiency is 77, = 0.85 [960 K] (d) The entropy production within the intermediate heat exchanger [3.2 kW /K] Wn = 10,000 kW Wn =? Turbine Turbine P3= 4.5 bar T3 = ? T = 1100 K P2=5 bar P4 =1 bar Air 2 3 T, = 1400 K Pi = 20 bar www Ts = 1480 K -5 Ps 1.35 bar ms = 1200 kg/min Heat exchanger V T = 1200 K P6 = 1 bar Air in

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

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Concept explainers

Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

Air (Rair = 0.287 )
as an ideal gas flows through the turbine and heat exchanger arrangement
kg-K,
shown below. Steady-state data are given on the figure. Stray heat transfer and kinetic and potential
energy effects can be ignored. Sketch a T - s diagram of processes 1-4 and determine:
(a) The entropy production of turbine 1 [3.2 kW /K]
(b) The isentropic efficiency of turbine 1 [75%]
(c) The exit temperature of turbine 2 if its isentropic efficiency is nr, = 0.85 [960 K]
(d) The entropy production within the intermediate heat exchanger [3.2 kW/K]
W1 = 10,000 kW
Wn= ?
Turbine
Turbine
P3= 4.5 bar
T3 = ?
T = 1100 K
P2=5 bar
P4 = 1 bar
Air
wwww
www
2
4
T = 1400 K
Pi = 20 bar
Ts = 1480 K
5 Ps = 1.35 bar
ms = 1200 kg/min
Heat exchanger
V T = 1200 K
P6 =1 bar
%3D
Air
in

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