FIRST LAW OF THERMODYNAMICS
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Instructor’s Visual Aids Heat Work and Energy. A First Course in Thermodynamics © 2002, F. A. Kulacki Chapter 4 Module 5 Slide 1 The First Law of Thermodynamics FIRST LAW OF FIRST LAW OF THERMODYNAMICS THERMODYNAMICS
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FIRST LAW OF THERMODYNAMICS. Heat Loss, (W). Mechanical Work Out. Motor. Electrical Power Input (W). m. z. Adiabatic work. Work Transfer. System. Adiabatic Boundary. Surroundings. Equivalence of adiabatic processes. State 1. Any adiabatic path can be used to connect - PowerPoint PPT Presentation
Transcript of FIRST LAW OF THERMODYNAMICS
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 1The First Law of Thermodynamics
FIRST LAW OF FIRST LAW OF THERMODYNAMICSTHERMODYNAMICS
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 2The First Law of Thermodynamics
Mechanical Work OutMechanical Work Out
Heat Loss, (W)Heat Loss, (W)
Motor
ElectricalElectricalPower InputPower Input(W)(W)
inW
Q
mout PEW
cz
g
gmF ,0,0
mm zz
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 3The First Law of Thermodynamics
Adiabatic workAdiabatic work
SystemSystem
Work Transfer
SurroundingsSurroundings
Adiabatic Boundary
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 4The First Law of Thermodynamics
Equivalence of adiabatic processesEquivalence of adiabatic processes
AnyAny adiabatic path adiabatic path can be used to connectcan be used to connectthe two states, and the two states, and allall adiabatic paths betweenadiabatic paths betweenthe states will require the states will require the same amount of the same amount of work transfer.work transfer.
State 1State 1
State 2State 2
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 5The First Law of Thermodynamics
First Law StatementFirst Law Statement
The adiabatic work done onThe adiabatic work done ona closed system to connect a closed system to connect
two equilibrium statestwo equilibrium statesis independent of path.is independent of path.
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 6The First Law of Thermodynamics
The First Law The First Law
1221, EEWadb
Work done by the system is Work done by the system is positive by convention.positive by convention.
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 7The First Law of Thermodynamics
Internal energy, U Internal energy, U
1221, UUWadb
Work done by the system is positive byWork done by the system is positive byconvention. convention. KEKE1-21-2 = 0, and = 0, and PEPE1-21-2= 0. = 0.
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 8The First Law of Thermodynamics
The First Law of ThermodynamicsThe First Law of Thermodynamics
State 1State 1
State 2State 2
2121, UWadb
Experimentally base, Experimentally base, and never refuted byand never refuted byexperiment or theory.experiment or theory.
Adiabatic ProcessesAdiabatic Processes
Instructor’s Visual AidsHeat Work and Energy. A First Course in Thermodynamics© 2002, F. A. Kulacki
Chapter 4 Module 5 Slide 9The First Law of Thermodynamics
Key concepts and termsKey concepts and terms
Adiabatic Work TransferAdiabatic Work Transfer
Total Energy, ETotal Energy, E
Expansion ProcessExpansion Process
First Law of ThermodynamicsFirst Law of Thermodynamics
Internal Energy, UInternal Energy, U
Path independencePath independence
Quasistatic processQuasistatic process
Shaft WorkShaft Work
