[Stoves] Low tech, high performance dung and wood burning stove, Muminabad, Tajikistan

Sat Mar 5 04:17:01 CST 2016

They say sheep and cattle ‎live together so the dung is mixed. What I saw and used was cow dung 100%.

Goats, no.

I made the later version of the GTZ7 with adaptation to suit the local brick which is quite large. 254x127x63 with many oversized on the 63. As much as 67.

It burns without smoke and has COr of 0.17% and still falling when I had to leave. The doors are good, I have a new idea got the grate which now can be removed to take out ash which is more like stones‎. Very poor quality coal locally. Kyrgyzstani coal is good.

With no heat exchanger at all it was 53% efficient as a heater -they use chimney pipes to take heat to another room. Very effective.

We call this stove model 4. The loose plate on the top for cooking was 410 degrees.

I am running to the capital now. 4 hrs north.

Regards
Crispin

BBM 'Crispin'
From: Lodoysamba Sereeter
Sent: Saturday, March 5, 2016 13:43
To: Crispin Pemberton-Pigott
Reply To: Discussion of biomass cooking stoves
Cc: Stoves
Subject: Re: [Stoves] Low tech, high performance dung and wood burning stove, Muminabad, Tajikistan

Interesting. Where is it? When photo was taken? Do they use goat dung or
just cow dung? probably no camel dung. It seems stove is done from metal
sheet and lit is cast iron.

What does it mean two hole stove?

Best Regards,
Lodoysamba

On 4 March 2016 at 01:09, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Dung Burners
>
>
>
> It is not often we hear about high performance dung burning stoves. This
> is your chance to participate.
>
>
>
> [image: cid:image003.jpg at 01D17599.3F600B00]
>
> This prototype is a two-hole heating and cooking stove with a drop on
> water heating attachment in place. The water heater is an option. The
> system holds 41 litres including the heat exchanger. The temperature coming
> out rose to 90 C after cycling once through the pipes.
>
>
>
> The cooking power was measured at 2.65 kW which translates into a 10
> minute 5-litre boil. The water heating power is 3.5 kW. The energy
> efficiency of the package is 75%. It can cook with dung, though most people
> here co-fire it with wood as they have access to both.
>
>
>
> The dung only burning requires (or should have) a grate. There is no
> opening downwards in the stove, no ash drawer. The grate is elevated at the
> back and lies flat on the floor at the front. The CO/CO2 ratio is about 3%
> and the stove cost is in the region of $35.
>
>
>
> The interior is lined with standard (local) bricks which are optional, in
> order to reduce the initial acquisition price.  Options include the bricks,
> the grate, the water heater, the tank with hoses and extended chimneys in
> order to push heat into other rooms.
>
>
>
> Today we tested a coal stove that is less than half the size of this one
> and demonstrated that we can get an effective delivery of heat into an
> adjacent room without a pump (using thermosiphon only).
>
>
>
> An alternative model has a gas-to-air heat exchanger giving 75% efficiency
> without the water heater in place. Other options include getting it without
> the cooking holes – just water heating by placing containers on top of the
> flat surface. After running for several hours the main body temperature on
> the outside is 88 degrees C so it is much safer for children than a lot of
> other stoves. The top is very hot, >300 C in places so cooking efficiency
> is pretty good.
>
>
>
> The new coal stove which can burn both terrible stony coal and good
> imported coal almost entirely without visible smoke for a number of hours
> is an immediate hit. With the Kyrgyzstani coal we saw today a CO/CO2 ratio
> of 0.06% with an excess air level of 35%. It was stable for extended
> periods at 0.15% at 45% EA. It will also be in the region of $35. It is a
> TLUD with fixed secondary air and controllable primary air. It can cook one
> pot.
>
>
>
> Regards
>
> Crispin in Muminabad
>
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