the system consisting of a turbine, an associated control-volume, and a throttling process.
the expansion process
the turbine
the control volume associated with the extraction turbine in the extraction-turbine-system
(Forall (?Self ?Time)
(<=> (Active ?Time Extraction-Turbine-System ?Self)
(And (Extraction-Turbine-System ?Self)
(Active ?Time System-Model ?Self))))
(=> (Extraction-Turbine-System ?Self)
(And (Cv-Component (Xtbn-Cv ?Self) (Xtbn ?Self))
(Component-Cv (Xtbn ?Self) (Xtbn-Cv ?Self))
(Process-Cv (Expsn-Prcs ?Self) (Xtbn-Cv ?Self))))