tion? Like about a 50 or 100 lb bag or the like...

7/21/2008 4:21:57 PM

what do you need to absorb? i mean obviously water, but could you just use kitty litter or perlite or something instead

[Edited on July 21, 2008 at 4:26 PM. Reason : &]

7/21/2008 4:24:28 PM

I need something that craves water like your mom craves cock.

And something that remains solid and can be regenerated.

7/21/2008 4:42:04 PM

perlite doesn absorb water well


vermiculite does much better

7/21/2008 4:42:35 PM

i didn't think that zeolite was used for water absorption. i know it's used to get rid of ammonia in fish tanks and litter boxes...

7/21/2008 4:44:41 PM

It is used for ammonia adsorption...all depends on the composition. You can get zeolites that are extremely hydrophilic, and then you can get them extremely hydrophobic. And everywhere in between. Often used as molecular sieves.

7/21/2008 4:46:23 PM

so why do you want it to absorb water if it's used to absorb ammonia? or am i missing something?

7/21/2008 4:47:52 PM

Yes, you are missing something.

Water adsorption refrigeration. I gots an idea based on the "off the grid" thread...

7/21/2008 4:49:34 PM

care to elaborate, out of curiosity?

you can buy propane refrigerators, but they're expensive to run

7/21/2008 4:55:05 PM

over my head

7/21/2008 5:04:12 PM

shamwow?

7/21/2008 5:06:12 PM

Well, the whole idea is that some zeolites have such an attraction to water, that they can provide evaporative cooling in a sealed system (provided said system is in a partial vacuum).

By heating the zeolite, you can regenerate it. Requires some pretty serious heat (about 500-600 degrees Fahrenheit), but that's peripheral where I'm thinking about using it.

7/21/2008 5:08:47 PM

would it not be easier to use peltiers?

[Edited on July 21, 2008 at 5:17 PM. Reason : i.e. use the electricity to run a compression system]

7/21/2008 5:14:18 PM

Quote :

"shamwow?"

7/21/2008 5:16:47 PM

Quote :

"would it not be easier to use peltiers?"

Not when you have a source of free (or wasted) heat energy.

Besides, Peltier junctions are not very efficient and have a limited temperature range.

[Edited on July 21, 2008 at 5:19 PM. Reason : besides.]

7/21/2008 5:18:23 PM

yeah, i know they're not very efficient, but compression refrigerators are so much more efficient than the absorption ones i've seen, i thought it might balance out--but it depends on your application of course. just thought i'd throw it out there

7/21/2008 5:22:57 PM

adsorption cooling requires lots and lots of cheap waste heat to be cost effective. if youre talking about 500 degrees for this zeolite system an ammonia water system would be much more effiecient.
The equipment costs to handle 500 degree steam (680 psi) from your regen step would quickly price this system beyond its benefit.

You dont even need the zeolite. The heat separates the ammonia from the water. air condenses the concentrated ammonia. the ammonia mixes back with water absorbing heat. the cycle repeats.

[Edited on July 22, 2008 at 10:02 AM. Reason : .]

7/22/2008 9:50:51 AM

any pool supply place should have it or be able to get it for you, its often used to replace sand in the filters

7/22/2008 10:45:03 AM

^what kind of composition? MSDS?

7/23/2008 10:12:20 AM

zeobrite is the product i have seen the most. but there is also zeosand and other products.
http://www.zeobrite.com/Default.asp
http://www.zeobrite.com/PDF/Zeobrite%20Filtration%20and%20Ion%20Exchange2.pdf

Quote :

"Bulk Density 0.66 g/cc, 50 lbs./cu. ft. dry weight Particle Size 0.5 to 1.5 mm (other sizes available) Engineering Properties d10 = 0.55, d60 = 0.90, UC = 1.6 Color off-white Pore Volume 38 per cent (approx.) Surface Area 14 to 25 m2/g Ion Exchange Capacity 100 meq. / 100 g. Abrasion, ASTM C-131 20, grading C, 500 revolutions Crushing Strength 2,500 lbs./in.3"

Quote :

"PHYSICAL PROPERTIES: Particle Size 0.5mm-1.5mm Uniformity Coefficient 1.64 Effective Size 0.55mm Shape Factor 0.68 Wet Particle Density 1,800 grams/liter Abrasion, ASTM C-131 20, grading C, @ 500 revolutions"

http://www.zeobrite.com/PDF/Zeobrite%20MSDS.ChemTel.pdf

7/23/2008 1:00:32 PM

is shamwow any good? me and my boy were like NO WAY! wanna split em?

7/23/2008 5:08:12 PM

yes

7/23/2008 5:31:27 PM