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<p>
In the next figure, several features of the library are demonstrated with
a simple heating system with a closed flow cycle. By just changing one configuration parameter in the system object the equations are changed between steady-state and dynamic simulation with fixed or steady-state initial conditions.
</p>


<img src=\"modelica://Modelica/Resources/Images/Fluid/UsersGuide/HeatingSystem.png\" border=1>

<p>
With respect to previous versions, the design
of the connectors has been changed in a non-backward compatible way,
using the recently developed concept
of stream connectors that results in much more reliable simulations
(see also <a href=\"modelica://Modelica/Resources/Documentation/Fluid/Stream-Connectors-Overview-Rationale.pdf\">Stream-Connectors-Overview-Rationale.pdf</a>).
This extension was included in Modelica 3.1.
As of Jan. 2009, the stream concept is supported in Dymola 7.1.
It is recommended to use Dymola 7.2 (available since Feb. 2009), or a later Dymola version,
since this version supports a new annotation to connect very
conveniently to vectors of connectors.
Other tool vendors will support the stream concept as well.
</p>