Allocation of a system procesns to multiple unit process an its display in the Sankey diagramm

Question

Hello everyone!

I have established a process chain for aluminium processing. Every step need electric energy for sure, which is provided by the same system process (electricity mix low voltage for Austria). in the Sankey diagram I only see the accumulated contribution of all steps allocated to the last step. How can I display the share to the (modeled) custom upstream processes?? In my opinion, this way of displaying is changing the interpretation of results.

Kind regards,

Dieter

Comments

can you maybe post a screenshot - I do not understand the point I think, thank you!

Answer 1

a short remark after the case is sort of closed: after installation of openLCA2.0.2 the Sankey diagram looks like what I thought when asking the question six days ago (I was using 2.0.0). Now in the sankey diagram the Electricity mix process has connection to all three production process like it is drawn in the model graph. Thanks for the change done with the update

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Answer 2

Dear Mr. Ciroth,

sorry for not being clear! Here is the LCA model..

After calculation the Sankey diagram looks like this: 

In this view of the Sankey diagram it seems that all of the electric energy is allocated to the heat treatment process... If not how I can determine the contribution of electric energy to the other two processes.

Kind regards,

Dieter

Comments

doesnt it say the upstream amount in the sankey? Since the other two processes flow into the final process, they are allocated to it. Maybe check the contribution tree tab? or create a product system for each process you want to inspect, and the create a project to compare them side by side.
What impact method are you using and what category are you displaying in the sankey?

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Thanks for your comment! The hints regarding the upstream amount in the sankey diagram and the contribution tree tab were the right ones. in the contribution tree tab the electric energies and their impact category of every process step are listed. So there is no need of creating separate product systems.

Case closed I think... :)