Unit vs System Process in EN15804 add-on for Ecoinvent 3.9.1 problem

Question

Greetings.

I am using the EN15804 add-on for Ecoinvent 3.9.1

I run calculation for provider "treatment of waste concrete, S" and treatment of waste concrete, U" with the impact method 15804+A2.

The system process game negative results and the unit process gave me positive results. The values were the same.

I think that the positive results of the unit process are correct cause there is not any kind of absorption of emission for waste concrete treatment apart from carbonation for carbon emissions.

Is the system process also correct but from a different point of view??

I thought that both processes should always provide the same result.

Can anyone help?

Thanks

Comments

Hey Matias, thanks for letting me know. So it might be still an issue. Are you also using the Lazy/On-Demand calculations? They yield the same results, just that the process contributions or the Sankey Diagram are "calculated" on-demand when clicking on it. The Lazy calculations take a few seconds (standard and preferred way to calculate results) whereas the Eager calculations take a few minutes. SSD storage can improve the speed a lot, as well as sufficient RAM (at least 8GB).

Answer 1

Hello Giannis,

I raised this issue with EcoInvent before the update to 3.10. I hope they have updated it in the newest version, which i can see is available in Nexus.

If you cannot download it, i would agree that the disposal with an impact is the one to go with.

Good luck

Comments

The system process database from the EN15804 add-on by GreenDelta (based on ecoinvent 3.10) is online again on Nexus.

Nevertheless, I would always recommend the unit process database to see the supply chain, perform MCS, see and calculate data quality and so on, which is generally not possible with system process databases.

When using "Lazy/On-Demand" calculations, the unit process data sets can be also calculated very fast , within seconds,  in the newest openLCA and a computer that is maybe a few years old or newer.