An ideal gas undergoes the following sequence of mechanically reversible processes in a closed system: (a) From an initial state of 70 C and 1 bar, it is compressed adiabatically to 150°C. (b) It is then cooled from 150 to 70°C at constant 70°C 150 C pressure. (c) Finally, it is expanded isothermally to its original state. 70 C Calculate W, Q, AU, and AH for each of the three processes and for the entire cycle. Take Cy = (3/2)R and Cp = (5/2)R. %3D %3D If these processes are carried out irreversibly but so as to accomplish exactly the same changes of state (i.e. the same changes in P, T, U, and H), then different values of Q and W result. Calculate Q and W if each step is carried out with an efficiency of 80%.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
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OCESS ENGINEERING THERMODYANMICS
5: Learning Material
CHEM 3003/MECH3508
part 2
Exercise Problem
An ideal gas undergoes the following sequence of
mechanically reversible processes in a closed system:
(a) From an initial state of 70 C and 1 bar, it is
compressed adiabatically to 150°C.
(b) It is then cooled from 150 to 70°C at constant
70°C
150 C
pressure.
(c) Finally, it is expanded isothermally to its original
state.
Calculate W, Q, AU, and AH for each of the three
processes and for the entire cycle. Take Cy = (3/2)R
and Cp = (5/2)R.
70°C
%3D
%3D
If these processes are carried out irreversibly but so as to accomplish exactly the
same changes of state (i.e. the same changes in P, T, U, and H), then different
values of Q and W result. Calculate Q and W if each step is carried out with an
efficiency of 80%.
Transcribed Image Text:OCESS ENGINEERING THERMODYANMICS 5: Learning Material CHEM 3003/MECH3508 part 2 Exercise Problem An ideal gas undergoes the following sequence of mechanically reversible processes in a closed system: (a) From an initial state of 70 C and 1 bar, it is compressed adiabatically to 150°C. (b) It is then cooled from 150 to 70°C at constant 70°C 150 C pressure. (c) Finally, it is expanded isothermally to its original state. Calculate W, Q, AU, and AH for each of the three processes and for the entire cycle. Take Cy = (3/2)R and Cp = (5/2)R. 70°C %3D %3D If these processes are carried out irreversibly but so as to accomplish exactly the same changes of state (i.e. the same changes in P, T, U, and H), then different values of Q and W result. Calculate Q and W if each step is carried out with an efficiency of 80%.
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