% Verbal description for system Cycle (Cycle_desc.tex)
% Generated by MTT on Thu Dec 4 15:59:55 GMT 1997.
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% %% Revision 1.2 1998/06/30 12:46:49 peterg
% %% Changed CT2 to CU
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% %% Revision 1.1 1998/06/30 12:46:24 peterg
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% Revision 1.1 1997/12/08 09:37:04 peterg
% Initial revision
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The acausal bond graph of system \textbf{Cycle} is
displayed in Figure \Ref{Cycle_abg} and its label
file is listed in Section \Ref{sec:Cycle_lbl}.
The subsystems are listed in Section \Ref{sec:Cycle_sub}.
The system has two heat engine ports:
\begin{enumerate}
\item \textbf{[Heat]} and
\item \textbf{[Work]}
\end{enumerate}
By convention, energy flows in to the \textbf{[Heat]} port and out of
the \textbf{[Work]} port. Both ports are true energy ports.
The subsystem \textbf{CU} (Section \Ref{sec:CU}) is a two-port
component describing an ideal gas. It has two energy ports which, with
integral causality correspond to
\begin{enumerate}
\item Entropy flow in; temperature out
\item Volume rate of change in; pressure out
\end{enumerate}
Four \textbf{SS} components are set up as sensors to measure the
important quantities pertaining to the cycle:
\begin{enumerate}
\item \textbf{S} to measure the integrated entropy flow
\item \textbf{T} to measure the (absolute) temperature
\item \textbf{V} to measure the integrated volume change
\item \textbf{P} to measure the pressure
\end{enumerate}
\begin{table}[htbp]
\begin{center}
\leavevmode
\begin{tabular}{|l|l|l|l|l|}
\hline
Cycle & Compression & Heating & Expansion & Cooling \\
\hline
Otto & II & II & II & II \\
Carnot & II & DI & II & DI \\
Diesel & II & ID & II & II \\
Joule & II & ID & II & ID \\
\hline
\end{tabular}
\caption{Cycles and their causality}
\label{tab:cycles}
\end{center}
\end{table}
A number of cycles can be built depending on the causality of the
two ports \textbf{[Heat]} and \textbf{[Work]} of \textbf{Cycle}
Some possible cycles listed in Tables \Ref{tab:cycles} where each
table entry gives the causality on the heat and work ports
respectively.