constant expansion with heat addition, then constant volume

with internal heat transfer from the working fluid to a regenerator, then

constant compression with heat rejection, then constant volume with internal

heat transfer from the regenerator back to the working fluid

Isentropic

compression, then Constant-pressure heat addition, then Isentropic expansion,

then Constant-volume heat rejection

Isentropic compression, then

Constant-volume heat addition, then Isentropic expansion, then Constant-volume

heat rejection

Isentropic compression, then

Constant-pressure heat addition, then Isentropic expansion, then

Constant-pressure heat rejection

Isentropic compression, then

Constant-pressure heat rejection, then throttling, then Constant-pressure heat

absorption