Beating humidity

On 12/11/2010 9:07 PM, brianDG303 wrote:

Just as a discussion, I have had some experience trying to make even
quite small containers (art exhibit display cases) dust tight with a
notable lack of success, both by me and others I have observed. As
you seal the container, you don't actually change the amount of air
circulation, I suspect; you just change the velocity of the air at the
inlet points you can't close up. I am sure there is some benefit to
sealing, but to make a display case dust tight you seal up what you
can, then provide positive pressure through a lot of filters, or in
less critical situation just provide a lot of filter surface area to
lower the resistance of the filtered air. The problem is that
temperature differences inside to outside create air pressure
differences that push the air in and out. Perhaps a solution is to
seal up the trailer really well and then provide a source of inlet air
that is drawn across a long desiccant tray or something.

Maybe you need "ballast". Make the trailer airtight, but run a vent tube
from it to a plastic garbage bag half full of air: when the trailer
"breathes" it just moves air in and out of the garbage bag, and soon the
dehumidifier has all the trailer air (and bag air) dry, dry, dry!

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)