Interesting idea, though I'm not aware of any desiccants that would be appropriate for the scale we'd need to operate at here. Silica gel, for instance, wouldn't work because there's too much water to handle. Dehumidifiers could be used instead, but they heat up the air as they dry it out. I believe desiccants also heat up the air, but only slightly. Maybe they would heat up the air a significant amount if they were removing enough water from it for this scenario.