Bypass Steam Flow Formula

When the outlet water temperature would exceed the safe boiling point, some steam must be bypassed around the heat exchanger to limit the heat transfer. The bypass steam flow is calculated as the difference between the total steam flow and the steam flow required to achieve the safe boiling point temperature. This is only calculated when the boiling point warning flag is triggered.

\begin{equation}\label{eq:water-heating-steam-bypass-steam-flow} \dot{m}_{bypass} = \dot{m}_{steam} - \frac{\dot{Q}_{gain,adj}}{h_{s,in} - h_{s,out}}\end{equation}

Symbols

\(\dot{m}_{bypass}\)	Bypass steam flow \([\unit{ \kilogram\per\hour}]\)
\(\dot{m}_{steam}\)	Total steam mass flow rate \([\unit{ \kilogram\per\hour}]\)
\(\dot{Q}_{gain,adj}\)	Adjusted heat gain rate \([\unit{ \kilo\joule\per\hour}]\)
\(h_{s,in}\)	Inlet steam specific enthalpy (saturated vapor) \([\unit{ \kilo\joule\per\kilogram}]\)
\(h_{s,out}\)	Outlet steam specific enthalpy (saturated liquid/condensate) \([\unit{ \kilo\joule\per\kilogram}]\)