The Modelica.Fluid.Pipes.DynamicPipe model looks very convenient. It is like an "all in one" model. But I don't see any info about the convection heat transfer between the pipe and the fluid inside.
Is the model taking heat convection into account?
I am trying to model a heat exchanger made by a bundle of pipes. That's why it is important to incorporate the convection from both sides of the pipe.
Is it a better idea to use the Modelica.Thermal.Components.ThermalConductor model with combination with two convection models?
Thanks in advance.
DynamicPipe offers three different models for convective heat transfer. You select which one to use on the second parameter tab Assumption with the dropdown parameter HeatTransfer. (use_HeatTransfer must be set to true).
The models are the following:
IdealHeatTransfer: the temperature(s) on the heat_port is equal to the bulk temperature(s) in the fluid, i.e. no convective heat transfer in the fluid.
ConstantHeatTransfer: The temperature(s) on the heat_port are given by the relation Q_flow = h*A(heat_port.T - fluid.T) where the convective heat transfer coefficient h is constant (set h by clicking on the table icon next to the drop down).
LocalPipeFlowHeatTransfer: same relation as above, but is flow dependent. h is calucated as a function of geometry and fluid properties, i.e. h=f(Re,Pr)
You could choose to implement you own heat transfer correlation, by writing a model that extends from PartialHeatTransfer or PartialFlowHeatTransfer.
Regards, Rene Just Nielsen
Note: If you need a model of the wall separating the two fluids in you heat exchanger, you could use Modelica.Fluid.Examples.HeatExchanger.BaseClasses.WallConstProps