the system consisting of a boiler, an associated control-volume, and a ?? process.
the boiler
the control volume associated with the boiler in the boiler-system
the heat transfer process in the boiler
the water flowing through the boiler
(Forall (?Self ?Time) (<=> (Active ?Time Boiler-System ?Self) (And (Boiler-System ?Self) (Active ?Time System-Model ?Self)))) (=> (Boiler-System ?Self) (And (Cv-Component (Blr-Cv ?Self) (Blr ?Self)) (Component-Cv (Blr ?Self) (Blr-Cv ?Self)) (Process-Cv (Htfr-Prcs ?Self) (Blr-Cv ?Self)) (Substance-In (Blr-Cv ?Self) (Water-In-Blr ?Self)) (Substance-In (Inlet-Stream (Blr-Cv ?Self)) (Water-In-Blr ?Self)) (Substance-In (Outlet-Stream (Blr-Cv ?Self)) (Water-In-Blr ?Self))))