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Hello everyone,

here is my situation:

I imported the ecoinvent database in my openLCA software -> I copied two ident datasets in a now folder -> I changed one of the processes from unit to system -> I created two product systems (one with unit and one with system) and calculated both of them.

I can still not see any change anywhere and do not understand what the difference is or what a unit/system process would be useful for.

What am I missing?

Thank you very much in advance!
in openLCA by (230 points)

2 Answers

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by (2.4k points)
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Also to add that marking a process as "system" or "unit" does not change anything about the process itself. One can incorrectly tag a unit process as a system process or vice versa. The main reason for this tag is that it is used when creating a product system if you ask openLCA to prefer system processes over unit processes
by (230 points)
Awesome, this makes it so much clearer!
Thank you very much!
+1 vote
by (2.5k points)
A system process only contains elementary flows, resulting from aggregating the background system.

A unit process contains process inputs/ouputs (besides also elementary flows) such as electricity, processed materials, ...
by (80.9k points)
(and basically, the system process is an LCA calculation result, fully aggregated)