[Stoves] Cost of stoves

[Dean Still]

Dear All,

Let's not forget that the stove top can be shaped to get better heat
transfer.

Sometimes we can even use a skirt around the pot.

Best,

Dean

On Sat, Nov 10, 2012 at 3:03 AM, Crispin Pemberton-Pigott <
crispinpigott at gmail.com> wrote:

> Dear Paal and All
>
> This idea of making a replaceable combustor has additional benefits. The
> idea is already in use though it may not at first be obvious to a casual
> observer.
>
> ++++++++++
>
> Dean and Paul are right if they also adopt the original idea with the
> TLUD-ND from the 1980ties and see the TLUD as a kind of a wrapping for the
> fuel; a unit loaded with energy to be put into a stove. Then you will have
> a lot of more possibilities.
>
> ++++++++++
>
> I will post a photo of a stove I have recently seen in Cambodia which has
> a very substantial built-in brick and cement three-pot layout. There is a
> single chimney against the wall and three pot-holes. There is a wood fire
> space under or in front of each pot with a horizontal channel to the
> chimney behind it.
>
> This theme is used in Indonesia as well. I saw the exact same system used
> in urban Jogjakarta and a multi-pot single-fire version in rural Java.
>
> In all cases the hole is shaped so that it can take large woks and flat
> bottomed pots of different sizes from about 230mm to 900mm in diameter. The
> smaller pots are accommodated using reduction rings that fit the open hole
> and the pots.
>
> The point is the holes are substantial and the fires variable. When there
> is a desire to cook for a long time the ring(s) are removed and a
> taper-bodied stove that looks a lot like a tall JIKO is placed into the
> hole. This is a 'burner insert' or 'combustor' just as described by Paal.
>
> I have a photo of such a stove in operation. It has a charcoal burning
> stove dropped into the larger stove body. This can be done with all three
> holes if desired depending on what is cooking.
>
> As the concept is already well established, all that remains is to create
> other combustors that will either fit into the existing holes or stove
> body-combustor combinations that will accept appropriate pots.
>
> Further in our favour is that there is in Indonesia a (regionally?)
> established precedent for having an ash cleaning hole that is built into
> the floor below a clay grate. This satisfies the requirement to have a low
> overall height (about 300 mm) for the stove body. It means the combustor
> can be taller than 300 mm and still fit into the stove body.
> All the drop-in burners (which are stand-alone stoves if you take them
> out) can be improved as they stand so the new system performance should be
> much better than the baseline.
>
> Paal, in order to be able to get the PP or similar burners accepted in the
> same communities they will have to be 1) power controllable and 2)
> refuellable or the equivalent of refuellable such as a convenient swappable
> insert that can be managed easily.
>
> There is a stove in Mongolia that is copied from a Japanese brand 'Royal'
> which has two TLUD combustors connected by a Y-shaped channel to a common
> chimney. It is able toi cook constantly while swapping back and forth
> between two fires which can be run sequentially or in parallel. If one is
> started say, 1 hour before the other, the heat is continuous and the cook
> can re-charge the used one while the second burns.
>
> The big mis-match at the moment is the almost unchanging power output of
> the simple TLUD and the need for long term variable cooking for various
> foods, tea, palm sugar making, sea salt making, boiling chips and
> sterilising or heating water. People exercise quite a bit of control over
> the firepower during a burn cycle.
>
> For everyone's interest the most /hated/ aspect we could determine about
> stoves was the time interval between needing attention. At present it is
> about 5 minutes for domestic stoves. Although this will be investigated in
> the near future in detail, the people I interviewed rated a longer time
> away from the stove (perhaps 10-20 minutes) more valuable than fuel saving,
> smoke, ignition time, cost or fuel preparation (though objection to
> preparation of fuel was strong).
>
> The biggest opportunity I see at the moment with basically no change for
> the TLUD's is the load, fire and forget water steriliser. Lanny, don't
> forget. It can be a stand alone or a drop-in unit.
>
> Regards
> Crispin in Carrying Place, Ontario (is there really such a place??)
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