Forum for ecoinvent Version 3

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Written on 20.02.2019 by Gustav Sandin see context

Hi,

In the dataset documentation of the EI3.5 viscose dataset, on page 4, inputs from technospere are listed along with datasets. For example, under “sulfate pulp, bleached” it says “Use of existing data inventory “sulphate pulp, TCF bleached, at plant”. Does this mean that this dataset, which is from an older EI version and not part of EI3.5, has been used when creating the EI3.5 aggregated dataset on viscose production (e.g. as implemented in Gabi)?

Or has the new sulfate pulp datasets from EPIS, which in EI3.5 replaced old pulp datasets, indeed been used (which appears to be the case according to the u-so (disaggregated) EI3.5 dataset on viscose production in Gabi)? And if this is the case, is it so that the pdf documentation hasn’t been updated?

Thanks for your help,

Gustav 

Written on 14.02.2019 by Pascal.Lesage see context

The following datasets seem to have a water imbalance:

- treatment of water discharge from petroleum extraction, offshore, GLO

- treatment of water discharge from petroleum/natural gas extraction, onshore

They both have a reference product of -1 kg wastewater (i.e. there is 1kg of water input for treatment) and have 0,001m3 of water to environment. If that were all, it would be balanced like all other wastewater treatment datasets.

However, the datasets have an additional input of 0.001m3 of Water, salt, sole.

Hence, we have 2kg in, 1kg out.

 

 

Written on 14.02.2019 by Sawanna see context

Hi, I have a methodological question:

Is it possible to modify data in a particular unit process through intervension in data records - eg changing the chemical composition of the material and the amount of components? For example, how do you relate to the situation when the data in ecoinvent is for a specific type of metal, and to have specific characterisation of similar material we use as the basis the existing data for metal in ecoinvent but modify it changing the chemical composition and appropriate values? For example I would like to add the molybdenum to the material composition in one of existing unit processes. What is your recommendation concerning the methodology in such situation?

Thank you in advance!

Written on 05.02.2019 by luciavalsasina see context

Dear user, 

 

1) Steel is used as: Ancillary product for grinding (wearing parts).

2) Transport is not included in the cement production (transforming activity) as, in ecoinvent version 3, transport is included in the market activities, please refer to this FAQ

3) There is not a specific activity in ecoinvent for the "precast concrete process". You might want to look into dataset: "wind turbine construction, 2.3MW, precast concrete tower, onshore", this is though very specific to wind turbines.

 

Best regards, 

Lucia Valsasina, Junior Project Manager, ecoinvent

Written on 04.02.2019 by cleorf see context

Hi, I have some questions.

My goal is to create a generic concrete chain for a precast concrete house frame (reinforced precast beams and columns). 

-I plan to use the process cement production, Portland.

1) I saw that in the inputs of the process steel, low alloyed is used. What is the purpose of including it? Is it for reinforcement?

2) the cement production, Portland does not include the transportation of raw materials to the cement factory, am I right? 

3)as my generic chain will be for precast building elements, I need to include the “precast concrete process”. There is no process included in ecoinvent that refers to this, right? 

 

Thank you in advance! 

Written on 04.02.2019 by Florentine Brunner see context

Dear Leo,

The amount of infrastructure (PV-plant) input in this dataset is calculated with a mathematical relation, which you can see looks as follows: 1/(lifetime*(capacity*1000)*yield_corr)

The variables used for this formula are defined in the section “parameters” of the dataset. You can modify those parameters, namely the yield in kWh/kWp and if required also the capacity in MW of the plant you aim to model. The yield of the GLO dataset is 1045kWh/kWp.

Mind that depending on which LCA software you use, you might not see the parameters in the software. In that case, please log-in to access the datasets directly via the ecoinvent webpage.

Kind regards,

Florentine Brunner,

 

Data Analyst, ecoinvent

Written on 31.01.2019 by Leo see context

 Hello,

 

I want to change the Dataset " electricity production, photovoltaic, 570kWp open ground installation, multi-Si {RoW} " so it fits to the federal state of Andhra Pradesh in India.

As there is another global radiation in this area, the input of the photovoltaic plant has to be adopted (original value: 6,08*10^-8).

I have data for the annual global radiation per m², but don't know which specifications were used for the 570kWp PV-Plant in the dataset.

Can someone give me the information or the right documentation, thanky you very much!

Written on 30.01.2019 by Jperez see context

Thanks a lot, David

That's what I suspect, but as I had seen some direct figures about  direct and indirect  water content for some products I didn't want to spent time re-producing calculations already included in the database.

Best,

Julián

 

Written on 28.01.2019 by Florentine Brunner see context

Dear Francesco,

 

The dataset «gas boiler production” indeed represents a boiler of no more than 10kW. It is approximated with data from an oil boiler of comparable size. The largest oil boiler covered by our data is 1MW.

 

Perhaps you can find specifications from manufacturers on the material requirements of the 80MW boiler and make assumptions on the energy demand for manufacturing based on the production datasets of smaller boilers or other, larger industrial equipment suitable as rough proxy. Also mind taking into account the disposal and treatment of the material inputs at the end of their life. The assumed lifetime for the small boilers is 20 years in ecoinvent.

 

Kind regards,

 

Florentine Brunner

Data Analyst, ecoinvent

Written on 25.01.2019 by FrancescoNeirotti see context

Dear Ecoinvent Support Team,I am developing an LCA study about DH networks. I need to take into account the construction of large boiler system (around 80MW) that are the back-up system of the main plant (a combined gas cycle).I look for "Gas Boiler" and I found "gas boiler - RER" (UUID 855b753d-f050-3083-a46d-b009f09b52cf) in C:Manufacturing>28 Manufacture of machinery and equipment > ..... As far as I understood this flow is good for small size boiler plant ( in the order of kW)Is it also good for large size boiler?If not, what can you suggest to use?Thank you!

Written on 23.01.2019 by sagets see context

Dear Avraam,

 

Many thanks for your quick reply. I might be using the wrong database (ecoinvent_34_cutoff_lci_up_lcia_20180314)

In this one if you look in the picture attached, outputs only show elementary flows, and not the out[ut of 0.5kgs of compost. Which database are you using?

Thank you!

Sophie

 

Written on 23.01.2019 by Florentine Brunner see context

Dear User,

According to the report mentioned by my colleague Avraam, the dataset models a control cabinet of a CHP with a capacity of 160 kWel and 360 kW th, installed in the late 1980ies, which was chosen as representative for this purpose.

The price and measurements (h*l*w) were known about the control cabinet. In addition, the following assumptions were made:

·         Cabinet: 12m3 wall surface of 2mm depth made from steel with a density of 7.9*103 kg/m3, which results in a weight of 190 kg.

·         Electronics: based on the given price it was derived that the cabinet contains about 187 kg of electronics. This was broken down into several material fractions as listed in table 4.18 of the mentioned report.

·         Assumptions on energy requirements for the assembly and installation of the control cabinet were based on the available data on prices and energy intensities. 1690 kWh electricit energy, 82700 MJ natural gas and light fuel oil each, as stated in table 4.19, p. 40 of the report.

Given the assumptions and uncertainties involved in the energy data, you may wish to replace it with the specifc data you have for the system you are modelling.

 

Kind regards,

Florentine Brunner,

Data Analyst, ecoinvent