[Stoves] Servals natural draft wood stove

[rajan_jiby at dataone.in]

Dear Crispin,

Comments below.

Regards,

Rajan



>
> Message: 3
> Date: Thu, 19 Jul 2012 12:28:52 -0400
> From: "Crispin Pemberton-Pigott" <crispinpigott at gmail.com>
> To: "'Discussion of biomass cooking stoves'"
> <stoves at lists.bioenergylists.org>
> Subject: Re: [Stoves] Servals natural draft wood stove
> Message-ID: <04c801cd65cb$98aa8190$c9ff84b0$@gmail.com>
> Content-Type: text/plain; charset="us-ascii"
>
> Nice work Rajan
>
>
>
> I recognise a couple of parts from other devices in there. The black pot
> rest looks like it comes from a paraffin stove and the round thing under 
> it
> looks like.well sort of like a jelly mould made from stainless steel.

They are standard items from the market. Easy to replace if and when 
required.

>
>
>
> I am glad to hear you have put in a grate because excessive charcoal
> production lowers efficiency. You should also get a cleaner burn in terms 
> of
> emissions per kg of fuel put into the stove.

The grate greatly helps.

>
>
>
> I am glad to see also the pot skirt making a seal at the bottom edge. This
> adds to the draft. If you limit the air getting into the fuel hole (with a
> drop-down plate) you can get an increase in the flame temperature by
> limiting unneeded excess air. Have you tried it? When you add vertical
> height it usually pays to limit the air entrance cross section.

The fuel-wood stand is height-adjustable. One of the purposes here is to 
reduce/regulate the excess air  -  also encouraging air-flow at the bottom 
of the stand. The opening at the "flame concentrator" ( just below the 
vessel support ) is also tuned for 2 KW fire-power.

I have been toying with the idea of a drop plate also. But I am worried 
whether the user will find it convenient.

The pot-skirt is height adjustable ( 20 mm to 90 mm ) for various cooking 
appliances. Ten different heights are possible  -  5 in one direction and 
another 5 by reversing the pot-skirt.

The stove boils 3 kgs water in 18 minutes using around 200 grams of firewood 
( ambient temperature around 33 C ).

>
>
>
> Of course everyone will like the BA surface material!
>
>
>
> How much does it weigh?

The dry weight of the stove is around 7 kgs.

>
> How much does it cost, say per 100?

This of course, Servals has to say. I feel pricing is moderate.

>
>
>
> Regards
> Crispin
>
>
>
> +++++++
>
>
>
> Dear All,
>
>
>
> Servals wood stove is shown at the following link.
>
>
>
> This is a low-smoke stove with a rated fire-power of 2 KW.
>
>
>
>
> http://servalsgroup.blogspot.in/2012/01/servals-modified-natural-draft-wood.
> html
>