Heat Engine - Heat Engine Processes

Heat Engine Processes

Cycle Process 1-2
(Compression)		 Process 2-3
(Heat Addition)		 Process 3-4
(Expansion)		 Process 4-1
(Heat Rejection)		 Notes
Power cycles normally with external combustion - or heat pump cycles:
Bell Coleman adiabatic isobaric adiabatic isobaric A reversed Brayton cycle
Carnot isentropic isothermal isentropic isothermal
Ericsson isothermal isobaric isothermal isobaric the second Ericsson cycle from 1853
Rankine adiabatic isobaric adiabatic isobaric Steam engine
Scuderi adiabatic variable pressure
and volume		 adiabatic isochoric
Stirling isothermal isochoric isothermal isochoric
Stoddard adiabatic isobaric adiabatic isobaric

Power cycles normally with internal combustion:
Brayton adiabatic isobaric adiabatic isobaric Jet engines
the external combustion version of this cycle is known as first Ericsson cycle from 1833
Diesel adiabatic isobaric adiabatic isochoric
Lenoir isobaric isochoric adiabatic Pulse jets
(Note: Process 1-2 accomplishes both the heat rejection and the compression)
Otto adiabatic isochoric adiabatic isochoric Gasoline / petrol engines

Each process is one of the following:

  • isothermal (at constant temperature, maintained with heat added or removed from a heat source or sink)
  • isobaric (at constant pressure)
  • isometric/isochoric (at constant volume), also referred to as iso-volumetric
  • adiabatic (no heat is added or removed from the system during adiabatic process which is equivalent to saying that the entropy remains constant, if the process is also reversible.)

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