Hybrid Car – More Fun with Less Gas

help with design - solar powered water from air

register ::  Login Password  :: Lost Password?
Posted by Mathew on August 10, 2003, 3:07 am
 
Hi-

Any help with this would be appreciated. I'm trying to design a system
that could be used at a campsite to extract water from the air. I'm
thinking that I might be able to run a small dehumidifier (about $00)
and use the water that is collected.

How can I do this? I found some humidifiers that use 110V and run at 510
watts and 4.8 amps. I actually found a small solar powered fridge which
is almost what I want.

Can anyone suggest a complete system and approximate cost? Anyone been
down this path before?

Mathew



Posted by rlsusenet@NOSPAMPUHLEEZschnapp on August 10, 2003, 3:56 am
 


On 8/9/2003 8:07 PM, Mathew wrote:

I've never been down this particular road, but I do have a residential
PV system.

You generally figure on spending well over $ per watt.  Typically, a
120 W solar panel will cost a minimum of $00.

How long do you plan to run this system, per day?  If you only need it
for a couple of hours, you'll need a minimum system capacity of 1 kWH.
If you can count on charging the batteries for 4 hours per day, your PV
system will need to put out 250 W, calling for two panels.  And you'll
need an inverter capable of at least the 510 W output.  And you'll need
1 kWH of battery capacity.  Actually, to avoid destroying the batteries
too quickly, you'll want at least 2 kWH capacity (lead-acid batteries
really don't like being deeply discharged).  I'm guessing that the PV
portion of your water extractor will run at least $k, and will probably
be a bit more unwieldy than you may be expecting.


Posted by Mathew on August 10, 2003, 4:15 am
 rlsusenet@NOSPAMPUHLEEZschnapp.org wrote:


Holy Moses!
This minfridge only costs a hundred bucks!
http://www.siliconsolar.com/portable_solar_mini_fridge.htm



Posted by William P.N. Smith on August 10, 2003, 2:05 pm
 
But it's not solar powered.  It's AC/DC powered, with a battery
backup, and a useless little solar panel that hangs off the side and
pretends to help keep the battery charged.

You don't say what the humidity is or how much water you want to
condense from the air, but those would be critical datapoints for
designing your system.

--
William Smith    wpns@compusmiths.com    N1JBJ@amsat.org
ComputerSmiths Consulting, Inc.    www.compusmiths.com

Posted by Joe Fischer on August 10, 2003, 7:37 pm
 : Any help with this would be appreciated. I'm trying to design a system
: that could be used at a campsite to extract water from the air. I'm
: thinking that I might be able to run a small dehumidifier (about $00)
: and use the water that is collected.

       If the water is to be used for drinking
it should be treated to remove taste and bacteria.  

       Depending on where the campsite is, the black
night sky may do more condensing than a small dehumidifier,
my metal carport drips all night, and I may need to
actually insulate it to reduce the dripping.

       I have thought for a long time about using
a metal sheet painted black or coated with black
chrome, and a squeege or winshield wiper like
device to harvest the condensation.
       This might even work in the desert where
no water is available, but not so good where
humidity is always low.

       Isn't there any streams or snow near
the camp site? :-)

       Don't the boy scouts have some kind of
pills or iodine drops to make water safe to drink?

Joe Fischer

--
3

This Thread
Bookmark this thread:
 
 
 
 
 
 
  •  
  • Subject
  • Author
  • Date
please rate this thread