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TEC-Toolkit / cfkg

Data cleaning steps and mappings used to transform data from different sources to RDF
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Potential incorrect assumption about emission target in BEIS mappings and modified raw data #15

Open m-markovic opened 9 months ago

m-markovic commented 9 months ago

There are "groups" of conversion factors for calculating overall CO2e and then individual fractions of the other GHG.

For butane (2021 file ) we can find:

<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">

litres | kg CO2e | 1.74529 -- | -- | -- litres | kg CH4 | 0.00129 litres | kg CO2 | 1.74296 litres | kg N2O | 0.00104

Now from 2022 the file includes different GHG/Unit values:

<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">

litres | kg CO2e | 1.74529 -- | -- | -- litres | kg CO2e of CO2 | 1.74296 litres | kg CO2e of CH4 | 0.00129 litres | kg CO2e of N2O | 0.00104

We need to confirm whether, for example, the 0.00129 CF 1l of butane produces results in kilograms of CH4 (this assumption is present in the current version of the CF knowledge graph) or it is in fact kg of CO2e that quantifies the portion of CH4 released after burning 1 litre of butane. This is important because, for example, 1kg CH4 29.8 = 29.8kg CO2e. However, it seems that the official documents just changed the unit values without any changes in the conversion factors.

dgarijo commented 3 weeks ago

We have the wrong quantity kinds... BEIS datasets converts to CO2e of N2O, not N2O directly