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% Verbal description for system Pump (Pump_desc.tex)
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The acausal bond graph of system \textbf{Pump} is
displayed in Figure \Ref{Pump_abg} and its label
file is listed in Section \Ref{sec:Pump_lbl}.
The subsystems are listed in Section \Ref{sec:Pump_sub}.
\textbf{Pump} represents an ideal pumping component for compressible
or incompressible flow though a pipe.
The pump is ideal in the sense that the mass flow rate $\dot m$
depends only on the shaft speed $\omega$:
\begin{equation}
\dot m = k_p \omega
\end{equation}
It is implemented using three components:
\begin{itemize}
\item the ideal isentropic \textbf{wPipe} component which gives the
correct energy flows
\item the polytropic expansion \textbf{Poly} component which imposes
the correct temperature at the output of the pump. This component
imposes zero flow at all its ports and therefore does not affect
energy balance. It has a bicausal output imposing both the
temperature measured by the \textbf{SS} component ``T'' and a zero
flow.
\item the \emph{effort-bicausal transformer} \textbf{EBTF}
component. This component is an energy-conserving \textbf{TF}
component with non-standard causality. The modulus is determined by
the two imposed efforts ($T$ and $T_2$), and this modulus determines
the flows in the usual way. In particular, it makes sure that the
internal energy flowing from the pump to the following components
(imposing $T_2$) is correct.
\end{itemize}