Air is compressed from an initial state of 1 bar and 298.15 K to a final state of 3 bar and 298.15 K by three different mechanically reversible processes in a closed system: (a) Heating at constant volume followed by cooling at constant pressure. (b) Isothermal compression. (c) Adiabatic compression followed by cooling at constant volume. These processes are shown in the figure. We assume air to be in its ideal-gas state, and assume constant heat capacities, c = 20.785 and C=29.100 J.mol-¹.K-1. Calculate the work required, heat transferred, and the changes in internal energy and enthalpy of the air for each process. 6
Air is compressed from an initial state of 1 bar and 298.15 K to a final state of 3 bar and 298.15 K by three different mechanically reversible processes in a closed system: (a) Heating at constant volume followed by cooling at constant pressure. (b) Isothermal compression. (c) Adiabatic compression followed by cooling at constant volume. These processes are shown in the figure. We assume air to be in its ideal-gas state, and assume constant heat capacities, c = 20.785 and C=29.100 J.mol-¹.K-1. Calculate the work required, heat transferred, and the changes in internal energy and enthalpy of the air for each process. 6
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
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Air is compressed from an initial state of 1 bar and 298.15 K to a final state of 3 bar
and 298.15 K by three different mechanically reversible processes in a closed system:
(a) Heating at constant volume followed by cooling at constant pressure.
(b) Isothermal compression.
(c) Adiabatic compression followed by cooling at constant volume.
These processes are shown in the figure. We assume air to be in its ideal-gas state,
and assume constant heat capacities, ci= 20.785 and C=29.100 J.mol-¹.K-1.
Calculate the work required, heat transferred, and the changes in internal energy and
enthalpy of the air for each process.
P bar
6
4
2
0 5
с
2
10 15
20
vig x 103 m³
a
1
25
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