G

air flux through the bed (kg-air m-2 s-1)

h

maximum height of the bed (m)

ha

"volumetric" overall heat transfer coefficient (J s-1 m-3 °C-1)

hsubscript

heat transfer coefficient, as indicated by subscript (J s-1 m-2 °C-1)

Hsat

saturation humidity (kg-vapor kg-dry-air-1)

Hsubscript

humidity of phase indicated by subscript (kg-vapor kg-dry-air-1)

ka

scaled water mass transfer coefficient (s-1)

kb

thermal conductivity of the bed (J h-1 m-1 °C-1 or J s-1 m-1 °C-1)

kwall

thermal conductivity of the wall (J s-1 m-1 °C-1)

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