[Stoves] pot skirt efficiency estimates, scale-up

[Kevin C]

Dear Josh

Quoting Josh Kearns <yeah.yeah.right.on at gmail.com>:

> 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%?

If you use about 1 square foot of heat transfer area for each 3,500  
BTU per hour that you want to transfer to teh water, then you should  
have a water heater efficiency in the range of 75%

Best wishes,

Kevin
>
> 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
>