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OpenStudio: should you add adiabatic pipes and bypass branches manually?

I noticed that OpenStudio tends to add automatically some adiabatic pipes in the plant loops even if you didn't put any, including:

  • A Supply outlet pipe
  • A Demand inlet pipe
  • A Demand bypass pipe
  • A Demand outlet pipe

Why is it adding a bypass only to the demand and not the supply?

It seems that OpenStudio checks whether you have included the inlet/outlet pipes and doesn't add them if there are already there. But it seems that it will always add a demand pipe, even if you do have one. Why?

Should/can you manually create the pipes?