ThermalProperties.h

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#pragma once
 
struct ThermalProperties {
    double tempK                    = 293.15;   // 20C, standard room temperature
    double internalHeatPower        = 0.0;      // W          - generated heat inside the body
    double externalHeatFlux         = 0.0;      // W/m2       - net absorbed heat flux on the surface
    double entropyJPerK             = 0.0;      // J/K        - accumulated body entropy estimate
    float referenceTempK            = 293.15f;  // Kelvin     - reference for linear material coefficients
    float specificHeat              = 450.0f;   // J/(kg·K)  - iron
    float specificHeatTempCoeff     = 0.0f;     // 1/K       - linear cp temperature coefficient
    float thermalMassFraction       = 1.0f;     // 0–1       - fraction of body mass thermally active
    float emissivity                = 0.70f;    // 0–1       - oxidized metal
    float emissivityTempCoeff       = 0.0f;     // 1/K        - linear emissivity temperature coefficient
    float absorptivity              = 0.70f;    // 0–1       - absorbed incident radiation
    float absorptivityTempCoeff     = 0.0f;     // 1/K       - linear absorptivity temperature coefficient
    float heatTransferCoeff         = 10.0f;    // W/(m²·K)  - still air natural convection
    float conductivity              = 79.0f;    // W/(m·K)   - iron
    float conductivityTempCoeff     = 0.0f;     // 1/K       - linear conductivity temperature coefficient
    float density                   = 7874.0f;  // kg/m³     - iron
    float linearExpansionCoeff      = 0.0f;     // 1/K        - linear thermal expansion coefficient
    float meltingPoint              = 1811.0f;  // Kelvin    - iron, 0 if N/A
    float latentHeatFusion          = 0.0f;     // J/kg       - energy absorbed while melting
    float fusionProgress            = 0.0f;     // 0–1        - 0 solid, 1 liquid
    float boilingPoint              = 0.0f;     // Kelvin     - 0 if N/A
    float latentHeatVaporization    = 0.0f;     // J/kg     - energy absorbed while boiling
    float vaporizationProgress      = 0.0f;     // 0–1        - 0 condensed, 1 vapor
};