Heat Generated During Microbial Growth Calculator

Metabolic Heat Evolved Formula:

\[ Y_{heat\ evolved} = \frac{Y_{X/S}}{\Delta H_{substrate} - Y_{X/S} \times \Delta H_{combustion}} \]

Substrate Yield Coefficient (Y_X/S):

g/g

Heat of Combustion of Substrate (ΔH_substrate):

J/g

Heat of Combustion of Cell (ΔH_combustion):

J/g

Metabolic Heat Evolved (Y_{heat evolved}):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Metabolic Heat Evolution?

Metabolic heat evolved refers to the heat energy that is produced as a result of metabolic processes within living organisms, primarily during cellular respiration and microbial growth processes.

2. How Does the Calculator Work?

The calculator uses the metabolic heat evolution formula:

\[ Y_{heat\ evolved} = \frac{Y_{X/S}}{\Delta H_{substrate} - Y_{X/S} \times \Delta H_{combustion}} \]

Where:

\( Y_{X/S} \) — Substrate yield coefficient (g/g)
\( \Delta H_{substrate} \) — Heat of combustion of substrate (J/g)
\( \Delta H_{combustion} \) — Heat of combustion of cell (J/g)

Explanation: This formula calculates the metabolic heat evolved during microbial growth by considering the substrate utilization efficiency and energy content differences between substrate and cellular biomass.

3. Importance of Metabolic Heat Calculation

Details: Accurate calculation of metabolic heat evolution is crucial for bioreactor design, temperature control in fermentation processes, energy balance studies, and optimizing microbial growth conditions in industrial biotechnology applications.

4. Using the Calculator

Tips: Enter substrate yield coefficient (typically between 0.1-0.8 g/g), heat of combustion values for both substrate and cells (in J/g). All values must be positive numbers. The denominator must not be zero for valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is substrate yield coefficient?
A: Substrate yield coefficient is the amount of microbial biomass produced per unit of substrate consumed during microbial growth or fermentation processes.

Q2: Why is heat of combustion important in this calculation?
A: Heat of combustion values represent the energy content of the substrate and cellular biomass, which is essential for calculating the energy balance and heat evolution during microbial metabolism.

Q3: What are typical values for substrate yield coefficient?
A: Typical values range from 0.1 to 0.8 g biomass/g substrate, depending on the microorganism, substrate type, and growth conditions.

Q4: When might the denominator become zero?
A: The denominator becomes zero when ΔH_substrate equals Y_X/S × ΔH_combustion, which represents a theoretical energy balance point where no net heat is evolved.

Q5: How is this calculation used in industrial applications?
A: This calculation is used in bioreactor design for heat removal systems, optimizing fermentation conditions, and understanding energy efficiency in industrial biotechnology processes.