Josh
I suggest replacing the skirt concept with an internal 4"-6" pipe ala the usual
gas water heater. A used water heater could be a least cost approach and
already have the useful external insulation. You might find several sizes and
could move the TLUD between them depending on number of bathers involved.
You could control secondary air supply through varying gap between the stove
and the "Kelly kettle". Googling with images for "Kelly kettle" might give
some ideas. I found a youtube video in Italian by Nat Mulcahy showing rapid
heating.
I think your 20% estimate for external flame path probably OK, but the
internal chimney approach might give more like 100% improvement and be cheaper
even if you need a welder for the inner pipe for the 55 gallon drum approach.
Ron
On Sep 14, 2012, at 10:36 PM, Josh Kearns <[email protected]> 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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