21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is 1 bar. Determine reversible work and actual work assuming the process to be adiabatic. Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow. Take for air : e, = 1 kJ/kg K; R = 287 J/kg K. (Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]

21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is 1 bar. Determine reversible work and actual work assuming the process to be adiabatic. Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow. Take for air : e, = 1 kJ/kg K; R = 287 J/kg K. (Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]

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

21. In a steady flow air enters the system at a pressure of 10 bar and 200°C with a velocity of 100 m/s and leaves
at 1.5 bar and 25°C with a velocity of 50 m/s. The temperature of the surroundings is 25°C and pressure is
1 bar. Determine reversible work and actual work assuming the process to be adiabatic.
Determine also the irreversibility and effectiveness of the system on the basis of one kg of air flow.
Take for air : e, = 1 kJ/kg K ; R = 287 J/kg K.
(Ans. 200.65 kJ ; 178.75 kJ/kg, 21.90 kJ/kg ; 0.894]

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