[Stoves] Practical Stoves- Introducing The Versatile Stove
Paul Anderson
psanders at ilstu.edu
Wed Nov 16 16:27:00 CST 2016
Dale,
The side feed is interesting.
Also interesting is the thought of having a second burner that is
actually a fuel drying "configuration.
Going one step further, with a "skirt plus side channel" around the
large pot, the hot emisions could be directed to the smaller
pot-position that could receive the heat in an appropriate vertical
"channel" (almost a chimney) where the fuel could be drying.
Care should be taken that the "chimney" does not steal too much heat
from the large pot. (use a small partition or damper).
Joke: If you use a damper to help dry the damp fuel, will the fuel be
"un-damped" or some other play on words?
Paul
Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: psanders at ilstu.edu
Skype: paultlud Phone: +1-309-452-7072
Website: www.drtlud.com
On 11/16/2016 2:27 PM, Andreatta, Dale A. wrote:
>
> Kirk and others,
>
> Thanks for the compliments. An approximate formula I use for burning
> wood is that the energy content in Joules per gram is 20634-22894*MC
> where MC is the moisture content on a wet basis, as a decimal (not a
> percentage). The 20694 is the lower heating value of bone dry Douglas
> Fir. In the second term, 20694 out of the 22894 is the heat no longer
> available in the wood because it’s replaced by water, and the
> remaining 2260 is the energy to boil the water itself. With this
> formula you’ll have positive energy content up to 90% moisture.
> Getting it to sustain combustion would be a limiting factor. With the
> downfeed burner I’ve burned wood up to about 50% moisture, though the
> flames were getting pretty weak.
>
> I imagine drying wood with a stove would work if the wood is fairly
> small, perhaps up to 2 cm diameter. Actually, you’ve given me an
> idea. The most recent version of the Versatile Stove is side feed
> with both ends closed, rather than end feed. See photograph. The
> wood going into the side feed door would be angled to the left to burn
> under the big burner, or to the right to burn under the small burner,
> or both to heat 2 pots. This could also allow the small burner, if it
> is not being used to heat a pot, to serve as a wood holder and allow
> the wood to dry before going into the fire. The photograph shows the
> side feed variation, and the wood drying option.
>
> Currently, I have some sticks soaking in a tub of water to be tested
> tonight. If I can get them to burn, along with drier wood of course,
> then the wood drier option has merit.
>
> More on this later,
>
> Dale
>
> *From:*Stoves [mailto:stoves-bounces at lists.bioenergylists.org] *On
> Behalf Of *kgharris
> *Sent:* Thursday, November 03, 2016 4:48 AM
> *To:* Discussion of biomass cooking stoves
> *Subject:* Re: [Stoves] Practical Stoves- Introducing The Versatile Stove
>
> Dale,
>
> Thank you for the discussion of your recent work. I especially like
> the two versatile pot stands. These look to me to be very useful.
> The ability to use thicker and longer unprocessed wood to give a long
> burn time with low maintenance also adds to the versatility. I will
> have to think about the wet wood. It might be using more energy to
> evaporate the water then there is energy in the wood. The Prime stove
> has a nice design which holds wet wood to the outside of the stove so
> that waste heat will dry it. Making provisions to dry it before
> burning it might be better then burning it wet. There is a lot to
> think about in your discussion.
>
> Thank You,
>
> Kirk H.
>
> ----- Original Message -----
>
> *From:*Andreatta, Dale A. <mailto:dandreatta at sealimited.com>
>
> *To:*'Discussion of biomass cooking stoves'
> <mailto:stoves at lists.bioenergylists.org>
>
> *Sent:*Wednesday, November 02, 2016 8:39 AM
>
> *Subject:*[Stoves] Practical Stoves- Introducing The Versatile Stove
>
> For some time I’ve been promoting the idea that stoves need to
> have practical features to make them successful. Efficiency and
> low smoke are desirable, but not the primary concern of most
> users. Here is my first attempt at providing a stove to do that.
> For the moment I’m calling it The Versatile Stove, as it gives the
> user lots of options for using the stove.
>
> The main features of the stove are:
>
> 1.A very large combustion chamber allows it to burn large diameter
> wood of any length. Up to 8 cm diameter has been successfully
> burned.
>
> 2.It can handle 2 pots, one being up to 20 cm and the other up to
> 30 cm. Round or flat bottom can be used. Actually, a pot larger
> than 30 cm could be used, but then it is only a single pot stove.
>
> 3.The pots are cradled between the pot supports and are very
> stable (except pots that are greater than 30 cm).
>
> 4.With the large combustion chamber, fuel tending is minimized.
>
> 5.The stove is powerful, 5 liters is regularly brought to a boil
> in under 20 minutes.
>
> 6.The stove has some capacity to burn wet wood. This is still
> being explored.
>
> 7.Depending on how the fuel is arranged and managed, turn down
> ratios of about 3:1 are possible.
>
> 8.Unfortunately, fuel use is high and efficiency is low. This is
> also being worked on.
>
> 9.Smoke seems to be a function of the fire size, as with most
> stoves I’ve worked with. A big fire will make black smoke, the
> same as any other stove. Wood that isn’t properly catching fire
> will make white smoke, the same as any other stove.
>
> Attached is a document with more details and photographs to
> illustrate what I’m talking about. There is also information
> about future testing and modifications, as the development of the
> stove is continuing.
>
> Also in the pipeline, I’m a very part time professor at The Ohio
> State University, and I’m working with a senior student group on
> family size stoves with downfeed burners. These will be modeled
> after the downfeed burner developed by InStove for larger stoves.
> My work with downfeed burners in August at Stove Camp was very
> positive, so I think this may also produce a very good stove with
> a lot of practical features. More on this after they finish their
> work in May.
>
> Dale Andreatta, Ph.D., P.E.
>
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