Forum for ecoinvent Version 3

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Written on 26.05.2017 by Avraam.Symeonidis see context

Dear Paul,

The imbalance you observe is due to economic allocation.  The “copper mine operation” activity is allocated twice. Once having copper as a reference product and once having molybdenite as a reference product. In those cases, molybdenite and copper are by-products to the afore mentioned activities respectively. Allocation takes place using the financial value of the products. Molybdenite, has 70 times higher value than copper and therefore carries most of the burdens associated with this extraction. You may wish to check the unlinked (before linking and allocation) unit process (UPR) in ecoQuery of this activity and in the property tab you can find additional information regarding the price of the metals.

This situation you observe also occurs for other metals, when they are mined through operations that extract more than one metal. However, we are currently working on an allocation correction algorithm. Datasets in the future will be carefully documented, and correction exchanges will have comment, and some separate document will be published on our website for the users to be able to understand how the calculation occurs.

 

I hope this answer your question.

Best regards,

Avraam Symeonidis

Data Analyst, ecoinvent

Written on 26.05.2017 by Paul Suski see context

Hello,

I am working on process for high alloyed steel with 2% Molybdenum. I use "copper mine operation | molybdenite | cut-off" processes as the input for molybdenum (in v3.3).One of my indicators is input oriented (material footprint) and I receive very high results for the steel which is primarily based on the 2% molybdenum. Looking into the processes I saw that the input for 1kg of molybdenite is 14.7 kg of "copper, 2.19% in sulfide.." (and copper has a very high material intensity).

Now looking at process of copper concentrate, which is the coproduct ("copper mine operation | copper concentrate | cut-off") there is only an input of 0.209 kg of copper, 2.19% in sulfide.." for 1kg of copper concentrate.

Can someone explain to me why it takes 70 times more copper for molybdenite than for copper? And how 0.21kg of copper as an elementary flow is enough to produce 1kg of copper concentrate? Is there is mistake in the allocation?

Thanks for any help.

Paul

Written on 18.05.2017 by Avraam.Symeonidis see context

Topic:
LCIA cut-off

Dear Christina,

 

There are different activities producing "electricity, from municipal waste incineration to generic market for electricity, medium voltage" as by-product in the different geographies. While in AT is only MSW incineration, in CH (and RoW-feeding GR in your example) a variety of products get incinerated. Most of them are classified as "wastes" for the cut-off system model, but some are classified as "recyclable materials". The product " electricity, from municipal waste incineration to generic market for electricity, medium voltage" is itself classified as "ordinary" (allocatable). While in the case of waste treatment, ordinary by-products are supplied to downstream consumers burden-free, for activities treating recyclable material this is not the case. This explains the differences you see depending on the geography you look at. You may find more information related to the cut-off system model here.

 

Best regards,

Avraam Symeonidis,

Data Analyst, ecoinvent

Written on 17.05.2017 by Xrisstina see context

Topic:
LCIA cut-off

Hello, I d like to ask you why the LCIA of e.g. "electricity, from municipal waste incineration to generic market for electricity, medium voltage" in the cut-off system model is zero for some countries (e.g. AT) while for some others not (e.g. GR, CH)?

Thanks again,

Christina

Written on 14.05.2017 by Xrisstina see context

Thank you very much for your reply.

With respect to your reply to my second question, I ve opened the ecospold file with excel but I didn t manage to find the relevant information, maybe because it is to big... They only solution I ve found is to open it with EASETECH and then compare the emissions to those reported to the pdf documentation of the activities...

I d like to ask you one more thing...Why the LCIA of e.g. "electricity, from municipal waste incineration to generic market for electricity, medium voltage" in the cut-off system model is zero for some countries (e.g. AT) while for some others not (e.g. GR, CH)?

Thanks again,

Christina

 

Written on 12.05.2017 by NatashaSchoon see context

Dear Avraam,

 

Thank you for your asnwer. In that document you referred to can find the item(s) relating to my question in the sheet named "elementary exchanges".

Wood, hard, standingnatural resourcebioticm3 Wood, primary forest, standingnatural resourcebioticm3 Wood, soft, standingnatural resourcebioticm3 Wood, unspecified, standingnatural resourcebioticm3 

These are the ones that my question is relating to. I need to know if these are the fresh wood, still standing in the forest (is bark included, is it just the stem of also the branches etc?) is this just harvested wood or is this already seasoned wood?

 

Thanks again,

Natasha

Written on 12.05.2017 by Avraam.Symeonidis see context

Dear Christina,

The first file refers to an undefined inventory while the second one refers to a cumulative inventory. You can seek further assistance from EASETECH developers. I have done this dataset import for EASETECH before and there was a manual describing every step in an explanatory way. About your second question: unfortunately, you cannot distinguish a process like this using the file name of a dataset. You should open the dataset and look into the unit process exchanges where you can find information about the products and subsequently the byproducts.   

 

Best regards,

Avraam Symeonidis

 

Data Analyst, ecoinvent

Written on 12.05.2017 by Avraam.Symeonidis see context

Dear Natasha,

I unfortunately cannot find the dataset you have listed in your question. Perhaps you would like to check the activity “Activity Overview for ecoinvent 3.3, Undefined” file which you can download from here and let us know which exactly dataset you are looking at. I am assuming you are using the latest version of the database (3.3), otherwise please let us also know.

 

Best regards,

Avraam Symeonidis

 

Data Analyst, ecoinvent

Written on 11.05.2017 by Xrisstina see context

Hello, 

I want to import to the EASETECH LCA software for example an electricity production process in order to account for the consumption of electricity in an industry, but I am not sure which file should I import. If I choose to use the APOS system, should I use the one that is in the database called "ecoinvent 3.3_apos_ecoSpold02"  or the one in the database called "ecoinvent 3.3_apos_lci_ecoSpold02"? 

I d also like to ask how can I distinfuish from the filename of a heat and power cogeneration process in APOS, which one has electricity as the reference product and which one heat.

Thank you a lot!

Written on 10.05.2017 by NatashaSchoon see context

Hey!

 

I have a question relating to the inventory item called i.e. "Wood, hard, standing".

What does this mean exactly? Is this the actual still wet tree standing before it's cut, is it the wood right after harvesting or is it the dried wood?

 

Thanks,

Natasha

Written on 21.04.2017 by david.fitzgerald see context

Dear Assemien,

 

The market datasets are described here, as well as in the introduction to ecoinvent 3 webinar (on our youtube channel). They are also explained in more detail in the “Data Quality Guidelines for ecoinvent 3”, which you may download on this page

 

If you know exactly which technology is used to produce the product that you are interested in modelling, as well as the exact geography, then you may use the production process directly (however, no losses or transport are taken into account, so you will have to add them separately).

 

For the exact datasets (passenger car, diesel) that you listed, there is actually no difference between the market activity and the production activity, since there is only the GLO geography for this process for now. But this may change in the future.

 

 

Best regards,

David FitzGerald

Data Analyst, ecoinvent

 

Written on 21.04.2017 by david.fitzgerald see context

Dear Miguel,

Indeed, the way parameters are used is not always very explicit. The choice is left to the data providers as to how to define and use parameters. Since parameters are defined for each dataset separately, we prefer leaving the freedom to the data providers to define them in the way they think is best.

Thank you for your suggestion.

 

Best regards,

David FitzGerald

 

Data Analyst, ecoinvent

Written on 21.04.2017 by FFL UEB 004 see context

Hello, Good night.

I'm writing because I have a doubt on how to put energy from heat of a refrigeration system. In the database are options about heat but I think that none of them apply for this system so I'm asking for help to put this data.

Thank you so much!

 

Written on 17.04.2017 by Assemien see context

HI,

Iam Assemien

I'm a PhD Student and a new user of LCA methodology. Please, I would like to know the difference between production and market in ecoinvent database. I'm using  the SIMAPRO software to modelise my LCA projet.

For example, for the machine operation, we have various processes:

- Passenger car, diesel (GLO) I market for I Alloc Rec, S

- Passenger car, diesel (GLO) I production I Alloc Rec, S.

When I have to use the maket process and when I have to use the production process.

I hope you will help me.

Best regards