13. 2 kg of air at 5 bar, 80°C expands adiabatically in a closed system until its volume is doubled and itstemperature becomes equal to that of the surroundings which is at 1 bar, 5°C. For this process, determine :(i) The maximum work;(i) The change in availability;(iii) The irreversibility.For air take :c, = 0.718 kJ/kg K, u = c T, where c, is constant and pV = mRT, where p is in bar, v volumein m', m mass in kg, R is constant equal to 0.287 kJ/kg K, and T temperature in K.[Ans. (i) 122.72 kJ ; (ii) 82.2 kJ ; (iii) 15.2 kJ]

Given Data m=2 kgP1=500 kPaT1=80oCP2=100 kPaT2=5oC=278 KCv=0.718KJKg·KR=0.287 KJKg·K (a) maximum…

2 kg of air at 5 bar, 80°C expands adiabatically in a closed system until its volume is doubled and its temperature becomes equal to that of the surroundings which is at 1 bar, 5°C. For this process, determine : (i) The maximum work ; (ii) The change in availability; (iii) The irreversibility. For air take :e = 0.718 kJ/kg K, u = c, T, where c, is constant and pV = mRT, where p is in bar, V volume in m', m mass in kg, R is constant equal to 0.287 kJ/kg K, and T temperature in K. [Ans. (i) 122.72 kJ ; (i) 82.2 kJ ; (i) 15.2 kJ]

2 kg of air at 5 bar, 80°C expands adiabatically in a closed system until its volume is doubled and its temperature becomes equal to that of the surroundings which is at 1 bar, 5°C. For this process, determine : (i) The maximum work ; (ii) The change in availability; (iii) The irreversibility. For air take :e = 0.718 kJ/kg K, u = c, T, where c, is constant and pV = mRT, where p is in bar, V volume in m', m mass in kg, R is constant equal to 0.287 kJ/kg K, and T temperature in K. [Ans. (i) 122.72 kJ ; (i) 82.2 kJ ; (i) 15.2 kJ]

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

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

13. 2 kg of air at 5 bar, 80°C expands adiabatically in a closed system until its volume is doubled and its
temperature becomes equal to that of the surroundings which is at 1 bar, 5°C. For this process, determine :
(i) The maximum work;
(i) The change in availability;
(iii) The irreversibility.
For air take :c, = 0.718 kJ/kg K, u = c T, where c, is constant and pV = mRT, where p is in bar, v volume
in m', m mass in kg, R is constant equal to 0.287 kJ/kg K, and T temperature in K.
[Ans. (i) 122.72 kJ ; (ii) 82.2 kJ ; (iii) 15.2 kJ]

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