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02.16 Unsteady State Open Systems
Book navigation
- Chapter 1 - Basic concepts
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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
Steam Tank Filling
Energy Balance: Filling a Tank (LearnChemE.com, 5min) determine the final properties of a tank to which steam is added.
Comprehension Questions:
1. An empty tank is filled by opening a valve and allowing steam at 300°C and 8MPa to flow into it until the pressure equalizes. Estimate the final temperature (°C).
2. An empty tank is filled by opening a valve and allowing steam at 350°C and 8MPa to flow into it until the pressure equalizes. Estimate the final temperature (°C).
3. An empty tank is filled by opening a valve and allowing steam at 300°C and 6MPa to flow into it until the pressure equalizes. Estimate the final temperature (°C).
Evaporative Cooling
Evaporative Cooling Energy Balance (LearnChemE.com, 6min) apply the energy balance to liquid water that is evaporating and undergoing evaporative cooling.
Steam Tank Filling (Unevacuated)
Tank filling: Steam, Unevacuated (uakron.edu, 15min) Unsteady state problems are relatively easy to solve for ideal gases, especially when the tank is empty to begin. The solution process becomes more difficult using steam with some H2O already in the vessel. This demonstration shows how to adapt to the new situation. The point is to learn the manner of adapting, not so much answer for this particular problem. You may not be filling many tanks with steam in your life, but you will certainly be adapting to new situations. The steps of analysis, identifying pieces of the puzzle, and putting them together are key components of any such adaptation.