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Thermodynamics I

Thermodynamics I. Homework. Solutions. Working Fluid. Pure substances Liquid Gas Properties – determine phase Property diagrams Compressed liquid Mixture of liquid & vapor Vapor. Property Diagram. Pv , Tv , & Ts useful Tv Constant pressure heating Liquid Saturated liquid

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Thermodynamics I

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  1. Thermodynamics I

  2. Homework • Solutions

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

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

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

  6. Property tables • Homework – fill in table

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

  8. Ideal gas • Ideal gas characteristics • Ideal gas processes • Handout

  9. Polytropic process • Expansion/compression work

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

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

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

  13. System • Isolated • Closed • Open

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

  15. Working fluid • Pure • Property diagrams

  16. Example • A heating furnace burns fuel oil that releases 140,000 Btu/gal of thermal energy. Furnace combustion efficiency is 92%. How much energy is available in 100 gal?

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