[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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