This model approximates a transport delay using a first order differential equations.
The model consists of a mixing volume with two ports. The size
of the mixing volume is such that at the nominal mass flow rate
m_flow_nominal, the time constant of the volume is
equal to the parameter tau.
The heat flux connector is optional, it need not be connnected.
V0 to V_nominal to use consistent
notation.Modelica.Fluid to
Buildings library. This was done to track the
auxiliary species flow mC_flow.sta0. The earlier
implementation required temperature to be a state, which is not
always the case.