This node adds an initial value for the relative humidity that can serve as an initial condition for a transient simulation or as an initial guess for a nonlinear solver. In addition to the default
Initial Values node always present in the interface, you can add more
Initial Values nodes if needed.
For User defined, enter a value or expression for the initial value of the
Relative humidity 
. The default value is 0.5. Else, select an
Ambient relative humidity defined in an
Ambient Properties node under
Definitions.