Thermodynamics I. Homework  Solutions Pressure  Reference: absolute & atmospheric  Pascal’s contributions  Manometer  Hydraulic jack.

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Presentation transcript:

Thermodynamics I

Homework  Solutions

Pressure  Reference: absolute & atmospheric  Pascal’s contributions  Manometer  Hydraulic jack

Thermodynamics I  Energy Potential Kinetic Thermal – heat Work – pressure/volume Flow Internal

Thermo I  E  e  examples

Thermodynamics I  Work & heat Not properties Path functions: need direction of function Equivalence of work & heat: Joule

Thermo I  Heat Conduction Convection Radiation

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

Process  Properties  Work & heat  Direction convention

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

System  Isolated  Closed  Open

Process  Isometric  Isothermal  Isobaric  Adiabatic  Polytropic

Working fluid  Pure  Property diagrams

Example  th ED.  th ED.  th ED.  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?