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This feature is intended to model additional external moisture sources or sinks, such as those that would result from a chemical reaction like combustion where water is a reaction product, or from water phase change with a phase that is not modeled. In particular, this feature can be used to account for the additional liquid water that would enter a hygroscopic porous medium due to the melting of ice, since the solid water composing the ice cannot be modeled with Moisture Transport interfaces. But it should not be used to model condensation in a hygroscopic porous medium since liquid water is already modeled. The latter phase change automatically happens under the favorable conditions.
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When using a Heat and Moisture coupling, sources added with the Liquid Water Source feature are not accounted for in the heat transfer equations. If the generation or consumption of liquid water is associated to a thermodynamic process that generates or consumes heat, it should be manually added in the Heat Transfer interface.
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