Re: Tom's drips

["Kevin Chisholm" <kchishol@fox.nstn.ca>]

Dear Crispin

Theres a lot to cooling tower design, but the first question is:

Roughly how many BTU/Hr do you want to dispose of?

The next thing is to be aware that you will have very significant
evaporative losses, and unless your water is realtively mineral free, in
short order you will have scale buildups, unless you treat the water, or
bleed out a fraction to keep the disolved salts level below their saturation
point.

If this looks like it will present problems for you, then what about
considering a radiator from a dead car? That way, your water runs in "closed
loop."

If a cooling tower is appropriate, very roughly you will lose one pound of
water to evaporation for every 1500 BTU you dissipate. In theory, its about
1200 BTU of water per pound evaporated but the air that takes away the vapor
is also sensibly heated.

The air flow per pound of water is primarily dependant on the Wet Bulb
temperature of the entering air. You can get this information off a
Psychrometric Chart.

Permissable updraft velocities in a cooling tower are a function of droplet
size.... the smaller the droplet size, then the smaller must be the updraft
velocity to prevent carry-over. If you have droplets the size of rain, then
you should size the velocity so that it is say 70% of the terminal veloocity
of the raindrop

This is a general overview.... hopefully "The Duke of Burl"  can help you
with your specific questions.

Kindest regards,

Kevin Chisiholm

----- Original Message -----
From: "Crispin" <crispin@newdawn.sz>
To: "Stoves" <stoves@crest.org>
Sent: Tuesday, January 15, 2002 3:13 PM
Subject: Tom's drips


> Dear Tom, Duke of Burl
>
> Great name!
>
> >The most efficient heat transfer in a cooling tower is achieved by
> >dripping water down the flue. We used trays with holes in the
> >bottom to make the water drops. It looked like rain inside the flue,
> >we took the hot water out of the bottom.
> >
> >Tom Duke
> >Burlingtion Iowa
>
> I have been trying to get cooling towers for manual candle making machines
> and they cost a fortune and are too big.  How do I calculate the heat a
> cooling tower can deal with?  I am talking about one a foot square and 5
> feet high with a fan on top.
>
> The candle making machine has a water jacket around the moulding tubes and
> it can have water manualy pumped through it with a foor or hand pump.  The
> wax an be heated in a big wood-fired melter.  We have not been able to get
> anything off the shelf that will cool the water, especially something that
> can be manually operated.  If I drop the water from a great height with no
> fan, won't the droplets create a downdraft and ruin the cooling effect?
>
> Advice sought.
>
> Thanks
> Crispin
>
>
> -
> Stoves List Archives and Website:
> http://www.crest.org/discussion/stoves/current/
> http://www.ikweb.com/enuff/public_html/Stoves.html
>
> Stoves List Moderators:
> Ron Larson, ronallarson@qwest.net
> Alex English, english@adan.kingston.net
> Elsen L. Karstad, elk@wananchi.com www.chardust.com
>
> List-Post: <mailto:stoves@crest.org>
> List-Help: <mailto:stoves-help@crest.org>
> List-Unsubscribe: <mailto:stoves-unsubscribe@crest.org>
> List-Subscribe: <mailto:stoves-subscribe@crest.org>
>
> Sponsor the Stoves List: http://www.crest.org/discuss3.html
> -
> Other Biomass Stoves Events and Information:
> http://www.bioenergy2002.org
> http://solstice.crest.org/renewables/biomass-info/
> http://solstice.crest.org/renewables/biomass-info/carbon.shtml
>
> For information about CHAMBERS STOVES
> http://www.ikweb.com/enuff/public_html/Chamber.htm
>
>
>
>


-
Stoves List Archives and Website:
http://www.crest.org/discussion/stoves/current/
http://www.ikweb.com/enuff/public_html/Stoves.html

Stoves List Moderators:
Ron Larson, ronallarson@qwest.net
Alex English, english@adan.kingston.net
Elsen L. Karstad, elk@wananchi.com www.chardust.com

List-Post: <mailto:stoves@crest.org>
List-Help: <mailto:stoves-help@crest.org>
List-Unsubscribe: <mailto:stoves-unsubscribe@crest.org>
List-Subscribe: <mailto:stoves-subscribe@crest.org>

Sponsor the Stoves List: http://www.crest.org/discuss3.html
-
Other Biomass Stoves Events and Information:
http://www.bioenergy2002.org
http://solstice.crest.org/renewables/biomass-info/
http://solstice.crest.org/renewables/biomass-info/carbon.shtml

For information about CHAMBERS STOVES
http://www.ikweb.com/enuff/public_html/Chamber.htm