Had it been possible to recover the water removed by the dessicant, it could eventually make sense. But anyway, I remember seeing some air-conditioning systems which resort to cold water recirculation, as it has a higher thermal conductivity, so lowering the temperature of water through conventional refrigeration (sort of an oversized fridge) and then pump it through pipes inside a building would still be nearly as effective, consume less energy overall, and not take much moisture out of the air.
But anyway, unless it's a full-EV, most likely the moisture extracted from the air by a conventional air-conditioning system could still be used for water injection in the engine.
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