the three-input, one-output control volume
(Forall (?Self ?Time) (<=> (Active ?Time 3-1-Control-Volume ?Self) (And (3-1-Control-Volume ?Self) (Active ?Time 3-Input-Control-Volume ?Self) (Active ?Time 1-Output-Control-Volume ?Self))))
(Forall (?Self ?Time) (<=> (Active ?Time 3-1-Control-Volume ?Self) (And (3-1-Control-Volume ?Self) (Active ?Time 3-Input-Control-Volume ?Self) (Active ?Time 1-Output-Control-Volume ?Self)))) (Inherited-Facet-Value Slot-Value-Type 3-1-Open-Feedwater-Heater-System Fwt-Htr-Cv 3-1-Control-Volume) (=> (3-1-Open-Feedwater-Heater-System ?Self) (And (Value-Cardinality ?Self Fwt-Htr 1) (Value-Type ?Self Fwt-Htr 3-1-Open-Feedwater-Heater) (Value-Cardinality ?Self Fwt-Htr 1) (Value-Cardinality ?Self Fwt-Htr-Cv 1) (Value-Type ?Self Fwt-Htr-Cv 3-1-Control-Volume) (Value-Cardinality ?Self Fwt-Htr-Cv 1) (Value-Cardinality ?Self Mxng-Prcs 1) (Value-Type ?Self Mxng-Prcs Steady-Flow-Adiabatic-Mixing) (Value-Cardinality ?Self Mxng-Prcs 1) (Cv-Component (Fwt-Htr-Cv ?Self) (Fwt-Htr ?Self)) (Component-Cv (Fwt-Htr ?Self) (Fwt-Htr-Cv ?Self)) (Process-Cv (Mxng-Prcs ?Self) (Fwt-Htr-Cv ?Self)))) (=> (Fwt-Htr-Cv $X $Y) (3-1-Control-Volume $Y))