Josh,
You might consider, if you haven't already, sending it both through the center and around the outside in a split flow. Set it up so the skirt is a little restrictive and the center path is the preferred path, then incrementally block the center path to yield various percentage split flows and the lowest net stack temperature.

Hope that's not to expansive :)
Alex

On 15/09/2012 4:25 PM, Paul Anderson wrote:
Josh,

From experience, having the heat go through a single pipe/chimney in the center of the water tank is much better than having the heat go around the outside of the steel drum. And it is much less expansive.


Paul S. Anderson, PhD  aka "Dr TLUD"
Email:[email protected]    Skype: paultlud  Phone: +1-309-452-7072
Website:www.drtlud.com
On 9/14/2012 11:36 PM, Josh Kearns wrote:
I'm thinking about building a 5-gal TLUD fired 55-gal water heater for outdoor showers. I'm wondering if anyone has a ballpark estimate for heat transfer efficiency w/ and w/o using a pot skirt attachment. The hot water tank will be a 55-gal steel drum, so I think the setup is pretty analogous to a cookstove setup, just bigger.

20%?

Any thoughts are helpful, rough estimates OK.....thanks!


FYI, the char from the water heating setup will be used in arbor-loo style modular composting toilets. This infrastructure is being installed during a rambo design-and-build sesh for my wedding on a farm in rural Appalachia (USA), but will be used continually by future events at the site. Cool, huh?!?!

Josh



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