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Desiccant dehumidification

Desiccant dehumidification

Desiccant dehumidification

(OP)


Desiccants need regeneration once having absorbed humidity.

My idea is to span the inlet to a ventilation system with sheet desiccant material to remove evening humidity and having that sheet exposed directly to the sun during the day to regenerate the desiccant.

Perhaps the sheet holder can be constructed within a semi solar cooker (mirrored) configuration to speed the process.

For those familiar with the material, would this work?
 

RE: Desiccant dehumidification

If you are using Silica Gel you would need to get above the boiling point of water to effectively remove the moisture.
B.E.

RE: Desiccant dehumidification

(OP)
Thsnk you Berkshire.

I was not aware that it needed to be boiled to evaporate its absorbed moisture. Does it actually and uniformly need to exceed 100C?

Nevertheless certainly a solar cooker configuration ccould achieve that. No?

That kind of heat however would affect the temperature of the ventilation. In cool climates that could be an advantage but in hot a disadvantage. I live in FL USA.
Kind regards,
Cornelius

RE: Desiccant dehumidification

The recommended temperature for regenerating Silica Gel is 100 to 140 degrees celsius. A concentrating type solar cooker can achieve that. The flat plate types have a hard time getting over 70degrees celsius.

 I would suggest a damper and vent to allow the humid air to vent while the desiccant is regenerating.

The other suggestion would be a desiccant wheel running between a hot duct ( regenerative) and your cold duct.
B.E.

RE: Desiccant dehumidification

(OP)
Thank you Berkshire this is just what I need.
CVS

RE: Desiccant dehumidification

Hello all,

I am an intern at a company called voestalpine Elmsteel in Lafayette, IN.  I am going back to Purdue soon, and am trying to wrap up/implement a few projects before my time is up here.  We are having problems finding a solution to the excess water/cleaner solution vapor being exhausted by our aqueous parts washing machines.  They have a small footprint and exhaust the vapor at a low flow rate (somewhere around 30 CFM I believe), but over the course of the day, they expel 50 gallons of water in addition to about 2 gallons of cleaner into the factory in the form of vapor.  I cannot find a mist collector or desiccant dehumidifier that can extract that amount of liquid from the exhaust, but also run at a flow rate low enough to suit our machines.  In the past, a centrifugal unit was installed with ducts connected to the exhaust vent on top of the machine.  However, the blower ran at too high of a flow rate, and drew about 40 to 50 degrees F of heat from the machine.  For this reason, a lower CFM, high extraction machine is needed, but one that can extract the liquid at temperatures around 150 deg. F.  Does anybody know of a potential solution?

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