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Thermodynamics I

Thermodynamics I. Examples. 2.25 2.74 2.89. Wrap-up. Heat – work equivalent Chapter 2 Equations One-Minute Paper Test 1: 1/27 Chapter 2 Text – graphs & tables Formula sheet. Chapter 3. to_3_g Evaluating Properties. Conservation of energy. First law of thermodynamics Q – W = E

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Thermodynamics I

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  1. Thermodynamics I

  2. Examples • 2.25 • 2.74 • 2.89

  3. Wrap-up • Heat – work equivalent • Chapter 2 Equations • One-Minute Paper • Test 1: • 1/27 • Chapter 2 • Text – graphs & tables • Formula sheet

  4. Chapter 3 • to_3_g • Evaluating Properties

  5. Conservation of energy • First law of thermodynamics • Q – W = E • For closed system • Q – W = KE + PE+ U

  6. System • Isolated • Closed • Open

  7. Process • Isometric • Isothermal • Isobaric • Adiabatic • Polytropic 

  8. Process • Properties • Work & heat • Direction convention

  9. Thermodynamics I • Work • F x s • Piston/cylinder • Shaft work • Heat exchanger? • Rate of doing work? • Expansion work

  10. Working Fluid • Pure substances • Liquid • Gas • Properties – determine phase • Property diagrams • Compressed liquid • Mixture of liquid & vapor • Vapor

  11. Property Diagram • Pv ,Tv, & Ts useful • Tv • Constant pressure heating • Liquid • Saturated liquid • Vaporization – quality • Saturated vapor • Superheated • Critical point

  12. Property diagram • Quality definition • Tables • Pressure – saturated • Temperature – saturated • Specific volume • Internal energy • Enthalpy • Entropy • Interpolation

  13. Property tables • Homework – fill in table

  14. Ideal gas • Ideal gas characteristics • Ideal gas processes • Handout

  15. Polytropic process • Expansion/compression work

  16. Performance • Result/effort expended • Evaluate: degree, location? • What can be done? • Costs of improvements? • Payback?

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