T

± w

cooling water temperature (°C)

Vbed

volume of the bed within the bioreactor (m3)

vvm

volumes of air per bed volume per minute (m3-air (m3-bed)-1 min-1)

W water content on a dry basis (kg-H2O kg-dry-solids-1)

Wo initial water content on a dry basis (kg-H2O kg-dry-solids-1)

Wsat water content (dry basis) that the solids would have if they were in equilibrium with the gas phase (kg-H2O kg-dry-solids-1)

X total amount of biomass in the bioreactor (kg)

Xm maximum amount of biomass in the bioreactor (kg)

Xo initial amount of biomass in the bioreactor (kg)

YqX yield of heat from growth (J kg-biomass-1)

YXS yield of biomass from dry substrate (kg-biomass kg-dry-substrate-1)

YWX yield of water from growth (kg-H2O kg-biomass-1)

s effective porosity (void fraction) of the substrate bed (dimensionless)

X enthalpy of vaporization of water (J kg-H2O-1)

H specific growth rate parameter (h-1)

jupr fractional growth rate based on temperature (dimensionless)

fiFW fractional growth rate based on water (dimensionless)

fiopt specific growth rate parameter under optimal growth conditions (h-1)

fiT specific growth rate parameter as a function of temperature (h-1)

fiW specific growth rate parameter as a function of water activity (h-1)

pa density of the air phase (kg-dry-air m-3)

pb density of the bioreactor wall (kg m-3)

pS density of dry solid particles (kg m-3)

Chapter 23

Also see Tables 23.1 and 23.2.

The model converts all parameters and variables to a consistent set of units.

awb awinl awin2 awSP

A1 to A4

Ahw A

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