[Stoves] New video from Tajikistan and Kyrgyzstan stove pilots

[Crispin Pemberton-Pigott]

Dear Cecil

Please remove the addresses of your friends from messages to the Stove list. Perhaps you didn’t see that taking place.

Here is my reply:

>Please design me a small 2 pot front loading cooking and heating stove with a 4 hour fire box that has good primary air flow and heated secondary air (maybe with a flame tube) with a deep 24 hour  interior ash tray that is easy to slide out and empty ....that has a separate  6 inch vertical chimney. It should be easily convertable from burning split wattle wood to coal and/or wood pellets using grates that can be slide into the stove through the front door. Maybe it needs to be big enough to accommodate thin firebricks in the combustion chamber.

The only thing I will require you to change on your spec is the 6” chimney, That is far too large. Almost every stove I see has a chimney that is too large in diameter. You can use a 130-140mm diameter chimney, max. This should be located before you make the chimney connector. Find out if there is a 133 or 135 or 140 mm tube available.

Next, your fuel requirements can be met and the space you want to heat is…?

Let’s assume it is not larger than 50 sq m. At least the warmest part of the room. The chimney can go straight up because the stove I am connecting you to is already over 80% efficiency in terms of space heating so don’t put on a wandering chimney.

Point your welder to

http://www.newdawnengineering.com/website/library/Stoves/Kyrgyzstan/KG%20Model2.5/

and download the files there. You don’t have to download the .dwg or .tcw because you don’[t have a programme that can open them. All the drawings are individually poste as PDF’s.

I have been updating a couple of things for the cast iron top but you will use a steel sheet. I recommend you use 4mm or 5mm for the top surfaces (there are two), not the default 3mm.  The rest can be 3mm. For bricks you will get some refractory bricks from anywhere, but probably someone specialised. Not sure you will have to ask around. They are made in the Vanderbijl Park area or imported. You can ask for SK32’s or SK34’s which are probably available for lining boilers. If all that fails, use 75mm thick face bricks or 50mm thick pavers. It seems RSA has no 65mm bricks, not that I Could find for “Lu” Sumbane at Potch U.

In theory the stove can be made using only a welding machine and an angle grinder. You need two hinges for the door.

Operation:

The stove is lit from the far end, next to the flame tube entrance. Fuel is always pushed to the back before loading more, and the fire is always moving towards the air entrance. You could ask Adrian Padt to build it for you because he has everything and could make shortcuts like bending some parts.

One caution on fabrication is to make sure that the two sets of grate holders by the door are far enough away from the wall to get the brick behind. As the design is for 65mm bricks, not 75, you might have to cut the bricks at that point, and make the grate narrower. As it is, the grate will be about 10mm too wide to fit between the bricks. Optionally you can widen the body by 20mm all over to get the 75mm bricks into the side, standing as they do, along the walls.

You should be able to easily get a 4 hour burn as the inside is quite large.

Cooking:

You can cook on the large hole (you might want to make it smaller that the drawing because local pots are in the 254mm dia max for regular families. The small hole by the door is only useful for warming water later in the fire. It is really there as an observation port and loading coal if you use if that way (with the grate inverted and elevated). It will burn for more than 10 hrs with coal. The upper deck does not have a hole, only a cooking surface. There are wide reports that it cooks fine up there, heated by the flame from the flame tube. They consider it a two-pot cooking stove, not just a water warmer.

It will burn all biomass, dung to cotton stalks and junky things from wattle trees.

With the bricks in, it is really heavy. As they are easily removed, place it and then add the +50 kg bricks. You will be surprised as how effective it is at cooking. You might have to open a restaurant.

Adrian’s contact you have right?

Good luck. A welder should be able to make it in a day.

Crispin
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