updated biochar logic as CDR technology

[BertoGBG]

Closes # (if applicable).

Changes proposed in this Pull Request

The technology biochar pyrolysis in compile_cost_assumption.py was updated with change of basis for units and additional parameters. The changes is in line with the planned implementation in pypsa-eur PyPSA/pypsa-eur#2141. Biochar pyrolysis will be implemented considered a CDR technology rather than a biomass conversion technology, and all the parameters are expressed per tonne of CO2 sequestered.

Checklist

• [Y] Code changes are sufficiently documented; i.e. new functions contain docstrings and further explanations may be given in doc.
• [Y] Data source for new technologies is clearly stated.
• Newly introduced dependencies are added to environment.yaml (if applicable).
• A note for the release notes doc/release_notes.rst of the upcoming release is included.
• [Y ] I consent to the release of this PR's code under the GPLv3 license.

[BertoGBG]

The test expects 7 rows for biochar pyrolysis but the code now produces 9.
The 2 extra rows come from the new biochar yield and CO2 sequestration parameters your PR added. The test update from (7, 9) → (9, 9) is correct and intentional.

I also updated the parameters name to the standard e.g. "biomass input" -> "biomass-input"

[BertoGBG]

the output files were added and code detaisl fixed

[euronion]

Thanks for the PR and sorry for keeping you waiting for a review.

Can you elaborate what you mean by "as biochar pyrolysis is not considered as CDR technology"?
(The better the PR description and release notes are, the easier it is for us to review)
Your PR changes the units to deviate from the DEA data sheet, which does list the outputs as MWh.

Is your goal maybe to view pyrolysis as a CDR technology and change the units to reflect the costs and inputs per carbon sequestered?

[BertoGBG]

your comment is spot on, it was a typo (now rather than not). I have improve the text explainng the scope and linking it to the pypsa-eur feature. it should also explain why we changed basis for the paramaters and the reason for deviating from standard technology-data unit. however it will be consistent with the pypsa-eur implementation