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FIRST LAW OF THERMODYNAMICS

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

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FIRST LAW OF THERMODYNAMICS

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  1. FIRST LAW OF THERMODYNAMICS

  2. Heat Loss, (W) Mechanical Work Out Motor Electrical Power Input (W) m z

  3. Adiabatic work Work Transfer System Adiabatic Boundary Surroundings

  4. Equivalence of adiabatic processes State 1 Any adiabatic path can be used to connect the two states, and all adiabatic paths between the states will require the same amount of work transfer. State 2

  5. First Law Statement • The adiabatic work done on • a closed system to connect • two equilibrium states • is independent of path.

  6. The First Law Work done by the system is positive by convention.

  7. Internal energy, U Work done by the system is positive by convention. DKE1-2 = 0, and DPE1-2= 0.

  8. The First Law of Thermodynamics State 1 Experimentally base, and never refuted by experiment or theory. State 2 Adiabatic Processes

  9. Key concepts and terms Adiabatic Work Transfer Total Energy, E Expansion Process First Law of Thermodynamics Internal Energy, U Path independence Quasistatic process Shaft Work

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