Hello,
I got started in Modelica and I think I know how to create a component and a Library. Unfortunetaly, I am trying to create a heat exchanger model and it is not obvious. I can see the example of Heat Exchnger in the Fluids Library. It seems to be too complicated to be understand by a beginner. Please, does somebody have something that can help me to create step by step a heat exchanger so that I can understand the philosophy?

I use OpenModelica and Dymola demo.
Thank you.