LEGACY RESEARCH INVENTORY — NOT CURRENT FERMUNITS DOCUMENTATION

This file is preserved as historical planning and research context. It may
contain superseded formulas, unsupported claims, approximate values, proposed
names that were never implemented, or items still awaiting authoritative source
verification. See ../README.md and the maintained reference documents in the
parent directory for current FermUnits behavior.

================================================================================
       MASTER FERMENTATION CALCULATOR SPECIFICATION - PART 6: BIOFUELS
================================================================================
A technical backend manual covering continuous mass feed inputs, volumetric
productivity rates, metabolic yield efficiency formulas, and starch conversion
constants mapped directly to standard SI metric base and derived units.
================================================================================

--------------------------------------------------------------------------------
1. PROCESS CAPACITY & STREAM MASS VELOCITY
--------------------------------------------------------------------------------

*   Dry Metric Tons Per Hour (DMTh)
    - Description: Continuous mass feed unit tracking the absolute dry weight velocity
      of grain (corn, wheat) or cellulosic biomass substrate entering the starch
      liquefaction and cook lines per hour, strictly subtracting raw crop moisture.
    - Core Users: Biofuel process engineers, industrial plant managers, and financial analysts.
    - Metric / SI Baseline Value: Mass flow rate. Exactly 0.27778 kg per second (kg/s)
      of bone-dry organic matter entering the active processing stream (SI Base: kg, s).

*   Bushels of Corn Equivalent (bu)
    - Description: North American standard agricultural volume trade metric for raw feedstock.
      For conversion calculations, a commercial bushel of corn is treated as a fixed
      test weight of exactly 56 pounds (25.4012 kg) at a reference moisture content of 15%.
    - Core Users: North American grain buyers, farmers, and commercial fuel blenders.
    - Metric / SI Baseline Value: Fixed mass proxy unit. Exactly 25.40117 kg of bulk crop.

*   HIGH-PRECISION CONVERSION FORMULAS:
    - Bushels of Corn to Dry Metric Tons (at 15% Moisture baseline):
        DMTh = (Bushels * 0.02159) / Hours
    - Dry Metric Tons to Bushels of Corn:
        Bushels = DMTh * 46.3195

--------------------------------------------------------------------------------
2. KINETIC VELOCITY & REACTOR PRODUCTIVITY METRICS
--------------------------------------------------------------------------------

*   Volumetric Ethanol Productivity (g·L⁻¹·h⁻¹)
    - Description: The fundamental chemical engineering metric tracking the precise
      production velocity of pure ethanol output per liter of active fermenter volume
      per hour. Higher values dictate optimal yeast health and raw yield velocity.
    - Core Users: Plant laboratory directors, industrial microbiologists, and system design teams.
    - Metric / SI Baseline Value: Mass generation rate per unit volume.
      Expressed as: 1 g·L⁻¹·h⁻¹ = 2.7778 x 10⁻⁴ kg/(m³·s) (SI Base: kg, m, s).

*   Specific Fermentation Rate (g·g⁻¹·h⁻¹)
    - Description: Tracks metabolic velocity by calculating the mass of ethanol produced
      per single gram of active dry yeast cell weight inside the reactor vessel per hour.
    - Core Users: Yeast manufacturers and industrial bioreactor control programs.
    - Metric / SI Baseline Value: Normalized mass conversion rate (1/hour frequency unit).
      Expressed as: 2.7778 x 10⁻⁴ s⁻¹ (SI Derived: Hz / Base: s).

--------------------------------------------------------------------------------
3. YIELD COEFFICIENTS & BIOMASS MATH
--------------------------------------------------------------------------------

*   Theoretical Yield Coefficient (Y_ps)
    - Description: The absolute thermodynamic upper limit of glucose-to-ethanol
      conversion based on Gay-Lussac metabolic stoichiometry, assuming no carbon
      is lost to yeast growth or glycerol production.
    - Constant Metric Baseline: Exactly 0.5111 g of ethanol per 1.0 g of glucose.
    - Theoretical Starch Limit: One dry bushel of corn contains a constant structural
      potential yielding exactly 2.88 US Gallons (10.902 Liters) of pure fuel ethanol.

*   Real Brewhouse Conversion Efficiency (%)
    - Description: The calculated performance ratio comparing actual plant ethanol
      output volume to the structural chemical theoretical maximum potential of the feedstock.
    - High-Precision Multi-Variable Yield Equation:
        Plant Efficiency = (Actual LPA Yield / (DMTh * Substrate_Starch_Percentage * 0.5678)) * 100
        *(Where 0.5678 is the constant weight multiplier accounting for the chemical
        hydrolysis mass gain when starch converts directly to fermentable glucose).*
================================================================================
