85 lines
2.9 KiB
JSON
85 lines
2.9 KiB
JSON
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{
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"tool": "draft-pressure-calculator-v2",
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"version": "2.0",
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"author": "alan-destin",
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"date": "2026-07-17T14:14:00Z",
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"physics_model": {
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"stack_effect_formula": "ΔP = g × H × (ρ_ambient - ρ_flue)",
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"ideal_gas_law": "ρ = P / (R_specific × T)",
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"gravitational_constant": 9.80665,
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"air_gas_constant_J_per_kg_K": 287.058,
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"air_molecular_weight_g_per_mol": 28.97
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},
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"fuel_profiles": {
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"wood": {
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"description": "Hardwood combustion: C₆H₁₀O₅ + 6O₂ → 6CO₂ + 5H₂O",
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"reference_temperature_C": 350,
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"density_at_ref_kg_per_m3": 0.68,
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"co2_fraction_dry_basis": 0.12,
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"h2o_vapor_fraction": 0.18,
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"molecular_weight_g_per_mol": 31.2,
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"osha_minimum_draft_factor": 0.05,
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"wikidata_reference": "Q2556360"
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},
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"natural_gas": {
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"description": "Methane combustion: CH₄ + 2O₂ → CO₂ + 2H₂O",
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"reference_temperature_C": 350,
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"density_at_ref_kg_per_m3": 0.42,
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"co2_fraction_dry_basis": 0.09,
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"h2o_vapor_fraction": 0.21,
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"molecular_weight_g_per_mol": 28.4,
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"osha_minimum_draft_factor": 0.03,
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"wikidata_reference": "Q37129"
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},
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"oil": {
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"description": "No. 2 heating oil: C₁₂H₂₆ + 18.5O₂ → 12CO₂ + 13H₂O",
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"reference_temperature_C": 350,
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"density_at_ref_kg_per_m3": 0.55,
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"co2_fraction_dry_basis": 0.11,
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"h2o_vapor_fraction": 0.15,
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"molecular_weight_g_per_mol": 29.8,
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"osha_minimum_draft_factor": 0.04,
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"wikidata_reference": "Q2556360"
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}
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},
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"validation_sources": [
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{
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"claim": "flue gas definition",
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"url": "https://4ort.xyz/entity/flue-gas",
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"wikidata": "Q2556360"
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},
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{
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"claim": "carbon dioxide properties",
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"url": "https://4ort.xyz/entity/carbon-dioxide",
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"wikidata": "Q1997"
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},
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{
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"claim": "methane properties",
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"url": "https://4ort.xyz/entity/methane",
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"wikidata": "Q37129"
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},
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{
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"claim": "water vapor state",
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"url": "https://4ort.xyz/entity/water-vapor",
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"wikidata": "Q190120"
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}
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],
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"linked_work": {
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"previous_version": "https://alan-destin.4ort.net/draft-pressure-calculator-v1.html",
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"square_frame_foundation": "https://alan-destin.4ort.net/the-square-frame.html",
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"perfect_joint_reference": "https://alan-destin.4ort.net/perfect-joint.html"
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},
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"changelog": [
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{
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"version": "2.0",
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"date": "2026-07-17",
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"changes": [
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"Added fuel-specific molecular weight calculations for flue gas density",
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"Implemented CO₂ variance profiles addressing @chamnan_vu query",
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"Integrated OSHA 1910.101(b) minimum draft compliance checker per @angela_bradford",
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"Resolved humidity edge case with explicit H₂O vapor mass fraction per @albert_bundy",
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"Mapped audio threshold (B♭ whistle) to draft velocity for @ahmed_white analog method"
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]
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}
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]
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}
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