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02.15 Closed and Steady-State Open Systems
Book navigation
- Chapter 1 - Basic concepts
-
Chapter 2 - The energy balance
- 02.01 Expansion/Contraction Work
- 02.03 Work Associated with Flow
- 02.04 Lost Work Versus Reversibility
- 02.06 Path Properties and State Properties
- 02.07 The Closed-System Energy Balance
- 02.08 The Open-System, Steady-State Energy Balance
- 02.09 The Complete Energy Balance
- 02.10 Internal Energy, Enthalpy, and Heat Capacities
- 02.11 Reference States
- 02.13 Energy Balances for Process Equipment
- 02.15 Closed and Steady-State Open Systems
- 02.16 Unsteady State Open Systems
- 02.18 Chapter 2 Summary
- Chapter 3 - Energy balances for composite systems.
- Chapter 4 - Entropy
- Chapter 5 - Thermodynamics of Processes
- Chapter 6 - Classical Thermodynamics - Generalization to any Fluid
- Chapter 7 - Engineering Equations of State for PVT Properties
- Chapter 8 - Departure functions
- Chapter 9 - Phase Equlibrium in a Pure Fluid
- Chapter 10 - Introduction to Multicomponent Systems
- Chapter 11 - An Introduction to Activity Models
- Chapter 12 - Van der Waals Activity Models
- Chapter 13 - Local Composition Activity Models
- Chapter 14 - Liquid-liquid and solid-liquid equilibria
- Chapter 16 - Advanced Phase Diagrams
- Chapter 15 - Phase Equilibria in Mixtures by an Equation of State
- Chapter 17 - Reaction Equilibria
- Chapter 18 - Electrolyte Solutions
Ideal gas compression
Adiabatic Compression of an Ideal Gas (LearnChemE.com, 6min) calculate adiabatic temperature for compression of an ideal gas, both reversibly and irreversibly.
Comprehension Questions:
1. 10 mol/s of air is compressed adiabatically and reversibly from 298K and 1bar to 5 bar.
(a) Compute the exit temperature (K). (Hint: check out Eqn. 2.51.)
(b) Compute the power requirement (kW) for this compressor.
(c) Suppose the compressor was only 75% efficient, where efficiency≡Wrev/Wact for compression. Is the temperature of the irreversible compressor higher or lower than that of the reversible compressor? Explain.
(d) Calculate the temperature exiting a 75% efficient compressor.
2. Air is expanded adiabatically and reversibly (through a turbine) from 298K and 5 bar to 1 bar.
(a) Is the outlet temperature higher or lower than 298K?
(b) Suppose the air was expanded through a 50% efficient turbine. Would the temperature be higher or lower than the reversible turbine? Explain.
Adiabatic, Reversible, Ideal gas
Reversible Adiabatic Compression of Ideal Gas (LearnChemE.com, 5min) calculate the final conditions for adiabatic, reversible compression of an ideal gas. Here, we derive an important equation that should be memorized: (T2/T1)=(P2/P1)^(R/Cp).