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Originally Posted by Dunno
THX Lpork! 
I am thinking of putting an impeller from a card cooler/extractor directly above the mist maker:
This will prevent any larger droplets from hitting the radiator by flinging them out horizontally.
This will:
Hopefuly decrease the droplet size and give them a chance to evaporate more.
Agitate ther mist and help it to evaporate fully.
Perhaps a fan, blowing downward, without a circumferental frame/casing?? would be better? Like a vid card fan.
As I see it there is no way to get the temps down to the point where condensation becomes a problem:
This will only cool until the air becomes saturated. Condensation only occures when the air is over-saturated. |
Not sure about impeller idea, seems overly complicated to a droplet barrier. All you need is a simple barrier where the air doesn't travel a straight line. The droplets don't make the corner. Several folks have suggested for Evaps that opposed angle vents work:
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I'd imagine something like a thin scrubby pad would work.
Maybe even a couple of screens with a gap between would do the trick, slowing the droplets a bit.
Anything else with fans starts messing with your airflow, and the results would have to be experimentally determined.
As for condensation, the worry is not with how cool you get, we know you can't get below dew point. The worry is how much water vapor is in the exhaust and its temperature. Saturation is a nisnomer, there is no magic capacity of air to hold water vapor that varies with temperature of the air. Water vapor act like any other gas.
It all has to do with the temperature of the water vapor and its equlibrium of evaporation and condensation. Think of your exhaust water vapor and the ambient water vapor. If your exhaust water vapor were warmer than ambient, it would be quickly cooled. Since it is cooler than ambient it is quickly warmed. Under which condition, rapid heating or rapid cooling, is the equilibrium of condensation and evaporation likely to swing towards condensation?
Note that you can exceed 100% relative humidity with your setup. Relative humidity has to do with still air flat surface boundary conditions, not the actual amount of water vapor that the air can "hold". Water vapor is a gas and behaves like any other gas, having its own independent pressure.