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I still don't understand the difference between unit and system process. Could anyone explain it to me again?
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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!
openlca
unit process
system process (lci)
asked
Sep 6, 2021
in
openLCA
by
LisaEhm
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240
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answered
Sep 7, 2021
by
byoung
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selected
Sep 9, 2021
by
LisaEhm
Best answer
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
commented
Sep 9, 2021
by
LisaEhm
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240
points)
Awesome, this makes it so much clearer!
Thank you very much!
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+1
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answered
Sep 7, 2021
by
Bernhard
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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, ...
commented
Sep 7, 2021
by
Andreas Ciroth
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122k
points)
(and basically, the system process is an LCA calculation result, fully aggregated)
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