a The program converts all input variables and parameters to a consistent set of units. Note that where "biomass" is mentioned within the units, this represents dry biomass. b When the outlet gas water activity falls below this value, a mixing event is triggered during which water is added to the bed. c The inlet air temperature is also used as the initial temperature of the gas phase within the bed (Tgo °C).

d Used to calculate the initial water content of the solids (Wo, kg-water kg-dry-solids-1), using Eq. (22.5), in which case Wsat is replaced with Wo, awg is replaced with awso, and Tg is replaced with Tso.

e The water activity of the inlet air is also used as the initial water activity of the gas phase within the bed (awgo). This value is used to calculate the humidity of the inlet air (Hin) and the initial humidity of the gas phase (Ho), both of which have the units of kg-water kg-dry-air-1.

fThe initial mass of dry substrate per cubic meter (Sa, kg-dry-substrate m-3) is calculated as

Table 25.2. Values used for the base case simulation of those parameters and variables that cannot be changed in the accompanying model of an intermittently-mixed forcefully-aerated bioreactor

Symbol Significance

Base case value and unitsa

Parameters related to the growth of the microorganism

A1 Constant in the equation describing /J=f(T)

A2 Constant in the equation describing /u=f(T)

A3 Constant in the equation describing /u=f(T)

A4 Constant in the equation describing /u=f(T)

Yq Yield of metabolic heat from growth

Ywb Yield of metabolic water from growth

Other parameters and constants

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