Hi all,

we (@GregorB and I) have a problem with solving our oemof energy system model in combination with non-convex investment decisions.

Our model optimizes the power and heat supply of 7 buildings. The investment options include a district heating network with a total of 21 pipeline sections, for which two different pipeline types can be designed (DN20 or DN32), each.

Now the problem: If we give the model the possibility to design the pipelines linearly, solving the model takes about 10 minutes. If we set the pipe layout as non-convex decisions, we get no result even after 24 hours of calculation. We use the Gurobi solver with default settings.

Has anyone had such a problem before? We are grateful for every hint!