Cooling Phase Lethality Contribution

Calculates the cumulative lethality (F0) contributed during the cooling phase of a thermal sterilization process using the trapezoidal rule for numerical integration.

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1. Define Input Parameters

Reference Temperature (Tref)[°C]

z-value (z)[°C]

Time Step (dt)[min]

Lethal Rate at First Point (Lfirst)[dimensionless]

Lethal Rate at Last Point (Llast)[dimensionless]

Sum of Interior Lethal Rates (Lsum_int)[dimensionless]

Heat Transfer Coefficient (h)[W·m⁻²·K⁻¹]

Can Diameter (D)[mm]

Thermal Conductivity (k)[W·m⁻¹·K⁻¹]

2. Engineering Output

Biot Number (Bi)
- dimensionless

Total Trapezoidal Sum (S)
- dimensionless

Cooling F0 Contribution (F0_cooling)
- min

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Context & Assumptions

In thermal process engineering, the cooling phase provides significant residual heat that contributes to the total microbial destruction. Accurately quantifying this lethality prevents over-processing, ensuring food safety while maintaining product quality and nutritional integrity.

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Cooling Phase Lethality Contribution

1. Define Input Parameters

2. Engineering Output

Context & Assumptions

Understand the Engineering Principles

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