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 < [email protected]> 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??) > _______________________________________________ > Stoves mailing list > > to Send a Message to the list, use the email address > [email protected] > > to UNSUBSCRIBE or Change your List Settings use the web page > > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > for more Biomass Cooking Stoves, News and Information see our web site: > http://www.bioenergylists.org/ > >
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