Talk:Dehumidifier
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Does there exist, an Ultrasonic dehumidifier? The humidifier topic speaks of the ultrasonic, and that topic is well written. Mikey
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Explained very nicely. Great!!
Anyone have info on the lifetime of dessicants? Do they last forever? Sales pages don't seem to indicate a lifetime. I bought a cheap ($10 on sale) dessicant dehumidifier that I weigh to determine its effectiveness, and it seems to be less effective over time, though my recordkeeping was sloppy, so I'm not sure. It holds about 4 oz. If you add info, please delete this comment. I'm wondering if [I should use/they just use] salt. Elvey 16:35, 20 February 2006 (UTC)
Although I don't have a specific answer to your question, I do have a story related to dessicants. I spilled some white wine in the trunk/hatchback of my car so I rinsed and towel dried it. Since I was afraid of mold growing I also bought a dessicant. This one was designed to hang in a closet to keep the clothing nice. It had a nice smell so even after the trunk area was clean and dry I left it there, and forgot all about it. About two months later on a very hot day I returned to my car to find that the bag of dessicant had turned into a leaky gelatinous mess. Yuck. So I suppose there is a limit to what they can absorb and clearly you want to dispose of it before it has reached its capacity.
[edit] Desiccant Wheel
"Desiccant Wheel" -- I've seen this mentioned several times in the context of dehumidification for evaporative cooling, but never explained. Would someone who knows what this is add it to the article? Thanks! krc 03:33, 2 December 2007 (UTC) —Preceding unsigned comment added by Rumpuscat (talk • contribs)
"Very high humidity levels are also unpleasant for human beings, cause unsightly condensation and can make it hard to dry laundry."
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I don't know what this means with the second clause, except that the typer messed up some grammar. Deleting it until someone knows better.
[edit] Unreferenced long section removed
I have removed the following section, beacuse it is a bit long, and not referenced. I'd be happy with it being included again if it had references for the processes.
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The component that holds the desiccant material can have several forms. In one design, a cylinder sometimes called a "tower", holds the desiccant material. The process air is drawn through the cylinder for a period of time adding moisture to the desiccant then regeneration air is drawn through the cylinder which removes moisture from the desiccant. This process is cyclic, due to loading of the desiccant with time, and produces air at a variable moisture content. Some desiccant dehumidification units of this design utilize multple cylinders to help offset the cyclic nature of the design. Another design utilizes a "desiccant wheel". Here a wheel of inert material with small air passages parallel with the direction of air flow contains the desiccant. (Visualize a roll of corrugated cardboard 8 to 16 inches deep) The wheel exposed a tremendous amount of surface area coated with desiccant for the air to contact. The wheel is rotated very slowly typically between 8 and 20 rph while the process and regeneration air streams pass through the wheel. With this design the process is non-cyclic as the rotating wheel is always presenting freshly regenerated desiccant to the air process air stream. A consistant moisture content of the process air is achieved. A key factor to the success of this design lies in the sealing between the two air streams. A third design uses a liquid system. A desiccant such as lithium chloride (LiCl) which has a tremendously high affinity for water is actually mixed with water in a very high concentration. This solution is sprayed into the process air and removes additional water from the air reducing the LiCl concentration before being collected in a sump. A piping and pump system moves the solution from the sump to the regeneration heater which heates the solution forcing it to release some of the water before being returned to the spray head(s). A key to successful operation of this type of system is maintaining the proper desiccant concentration. If the concentration becomes too high the solution may solidify. If it is too low the dehumidification capacity will be diminished. Due to the corrosive nature of the LiCl-water solution parts carrying the soltuion must be made of corrosion resistant material such as stainless steel. Liquid desiccant are typically used in large industrial applications.
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