Hello,
I a doing a part of my master thesis with OpenLCA, with Ecoinvent dataset and Impact 2002+ method.
But whenever i want to calculate the results of my product system with an LCIA method I am not allowed to select a normalization / weighting set.
Thus, all my results are in "points" instead of "kg C02 eq" or "DALY"...
Does someone knows how to fix this problem?
Thank you.
Normalisation / single score
Re: Normalisation / single score
Hi Kenza,
indeed this looks strange.
openLCA applies normalisation and weighting only if normalisation and weighting sets are available; this is not the case for the default ecoinvent LCIA methods. They rather are provided with weighting and normalisation applied already. Therefore you have e.g. the different ReciPe end and midpoint methods. This is also true for Impact2002+, with an Impact2002+ (Endpoint) and an Impact2002+ (Midpoint) method. However, for Impact2002+, ecoinvent provides only two midpoint categories, see the screenshot below. This is not incorrect since only these are specific for Impact2002+.
Literature on Impact2002+ states (Jolliet et al, Int J LCA 10 (6) 2003):
Hope this helps!
Andreas
indeed this looks strange.
openLCA applies normalisation and weighting only if normalisation and weighting sets are available; this is not the case for the default ecoinvent LCIA methods. They rather are provided with weighting and normalisation applied already. Therefore you have e.g. the different ReciPe end and midpoint methods. This is also true for Impact2002+, with an Impact2002+ (Endpoint) and an Impact2002+ (Midpoint) method. However, for Impact2002+, ecoinvent provides only two midpoint categories, see the screenshot below. This is not incorrect since only these are specific for Impact2002+.
Literature on Impact2002+ states (Jolliet et al, Int J LCA 10 (6) 2003):
So, how to fix this problem? You can on your own integrate these other categories in the XML impact file that you import, copying from the EcoIndicator categories, or perform two separate analyses using EcoIndicator and Impact2002+ which is of course not so convenient.1.3 Other midpoint category effects
The characterization factors for the midpoint categories respiratory
effects, photochemical oxidation, ionizing radiation,
ozone layer depletion, terrestrial acidification/nutrification,
land use occupation, and mineral extraction are obtained from
Ecoindicator 99 (Goedkoop and Spriensma 2000), adopting
the default egalitarian scenario and by normalization to a reference
substance. For climate change, the latest IPCC Global
Warming Potentials (IPCC 2001) have been used with a 500
years time horizon to account for long term effects.
Hope this helps!
Andreas
 Attachments

 impact2002midpoint.jpg (122.85 KiB) Viewed 7884 times

 impact2002endpoint.jpg (153.03 KiB) Viewed 7884 times

 Posts: 7
 Joined: 08 Feb 2017 10:58
Re: Normalisation / single score
Dear Andeas,
Thanks for your explanation about reference sources of IMPACT 2002+ LCIA method.
But I have a question. when I use Ecoinvent LCIA method the impact results are in term of "points", i.e. the normalization process is performed already, although I've not selected any normalization method. But when I add OpenLCA LCIA mehtod, and select a normalization method I get the results in terms of reference substances and there is no normalized score. Isn't it paradoxical?
In this situation for having not normalized and normalized impacts, I should perform the calculation 2 times, one time without normalization sets and one time after adding that.
Regards,
Mohammad
Thanks for your explanation about reference sources of IMPACT 2002+ LCIA method.
But I have a question. when I use Ecoinvent LCIA method the impact results are in term of "points", i.e. the normalization process is performed already, although I've not selected any normalization method. But when I add OpenLCA LCIA mehtod, and select a normalization method I get the results in terms of reference substances and there is no normalized score. Isn't it paradoxical?
In this situation for having not normalized and normalized impacts, I should perform the calculation 2 times, one time without normalization sets and one time after adding that.
Regards,
Mohammad
Re: Normalisation / single score
Dear Mohammad,
I am not sure I understand, in the openLCA package we are not yet providing the impact world+ method, and in the eoinvent package that we distribute the endpoint method has also points, see also the pictures above?
Best wishes,
Andreas
I am not sure I understand, in the openLCA package we are not yet providing the impact world+ method, and in the eoinvent package that we distribute the endpoint method has also points, see also the pictures above?
Best wishes,
Andreas

 Posts: 7
 Joined: 08 Feb 2017 10:58
Re: Normalisation / single score
Thank you. but the only problem is that when the OpenLCA LCIA method is not added (so there is no normalization and weighing set), calculating the result (say Ecoindicator 99, (H,A)) leads to normalized scores in terms of points. but when the OpenLCA LCIA method is added, the result is in terms of endpoint reference units like PDF*m2*yr, DALY and MJ. I mean the actions are in reverse of corresponding commands.
Regards,
Mohammad
Re: Normalisation / single score
Dear Mohammed,
Ah I think I am getting it now  however, in openLCA 1.6 with method pack 1.5.5, you get a dimensionless value for normalisation results, and points for the single score, see the attachment, so the same as if you apply H,A "in one go" directly. This was your point, right? Thank you for your input!
Best wishes,
Andreas
Ah I think I am getting it now  however, in openLCA 1.6 with method pack 1.5.5, you get a dimensionless value for normalisation results, and points for the single score, see the attachment, so the same as if you apply H,A "in one go" directly. This was your point, right? Thank you for your input!
Best wishes,
Andreas
 Attachments

 20170411 21_35_56openLCA 1.6.2.png (42.67 KiB) Viewed 4255 times

 Posts: 7
 Joined: 08 Feb 2017 10:58
Re: Normalisation / single score
Dear Andeas,
Sorry but my point was not that. Consider a product system that I want to calculate its effects based on ecoindicator 99 (H/A).
When any normalization set is not added to the software the results are based on points!
When a normalization set is added to the software the results are based on endpoint effects' units (DALY, PDF.m2.year and MJ).
As I know a normalization set converts endpoint effect units to normalized points. but the software shows the results in terms of points when no normalization set is added. As I know it is incorrect based on definition. I use OpenLCA 1.5.0.
Best regards,
Mohammad
Sorry but my point was not that. Consider a product system that I want to calculate its effects based on ecoindicator 99 (H/A).
When any normalization set is not added to the software the results are based on points!
When a normalization set is added to the software the results are based on endpoint effects' units (DALY, PDF.m2.year and MJ).
As I know a normalization set converts endpoint effect units to normalized points. but the software shows the results in terms of points when no normalization set is added. As I know it is incorrect based on definition. I use OpenLCA 1.5.0.
Best regards,
Mohammad
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