Why are my LCA results inflated when I connect my processes into a product system?

Question

I am modeling a process in openLCA 2.5 using ecoinvent 3.12 and ReCiPe 2016 midpoint (H). when I connect the processes and create the product system, some impact results become unexpectedly high.

Answer 1

I would upgrade to 2.7 and you need to post some examples / images. Of course impacts get higher than in the first process when you calculate the life cycle with a product system.

Answer 2

Hello,

Make sure you have set providers for all your flows, if not this can lead to varying results when comparing results from a process calculation to a product system calculation.

(You can easily check this by running "Check linking properties" that can be found in the "Database" menu.)