Thermodynamics I
Examples
 2.25
 2.74
 2.89
Wrap-up
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Heat – work equivalent
Chapter 2 Equations
One-Minute Paper
Test 1:
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1/27
Chapter 2
Text – graphs & tables
Formula sheet
Chapter 3
 to_3_g
 Evaluating Properties
Conservation of energy
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First law of thermodynamics
Q – W = E
For closed system
Q – W = KE + PE + U
System
 Isolated
 Closed
 Open
Process
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Isometric
Isothermal
Isobaric
Adiabatic
Polytropic
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Process
 Properties
 Work & heat
 Direction convention
Thermodynamics I
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Work
Fxs
Piston/cylinder
Shaft work
Heat exchanger?
Rate of doing work?
Expansion work
Working Fluid
 Pure substances
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Liquid
Gas
 Properties – determine phase
 Property diagrams
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Compressed liquid
Mixture of liquid & vapor
Vapor
Property Diagram
 Pv ,Tv, & Ts useful
 Tv
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Constant pressure heating
Liquid
Saturated liquid
Vaporization – quality
Saturated vapor
Superheated
Critical point
Property diagram
 Quality definition
 Tables
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Pressure – saturated
Temperature – saturated
Specific volume
Internal energy
Enthalpy
Entropy
 Interpolation
Property tables
 Homework – fill in table
Ideal gas
 Ideal gas characteristics
 Ideal gas processes
 Handout
Polytropic process
 Expansion/compression work
Performance
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Result/effort expended
Evaluate: degree, location?
What can be done?
Costs of improvements?
Payback?