[Stoves] air velocity

Wed Mar 21 22:13:38 CDT 2012

Dear Mr. Tuladhar,
sorry to admit that I don't know the answer.
Yours
A.D.Karve

On Wed, Mar 21, 2012 at 3:42 PM, Sarbagya Tuladhar <sarbagya007 at gmail.com>wrote:

>  Hi Mr Kavre,
>
> Thanks a lot for the info.
>
> What would you say would be the air velocity for the Prakti Leo stove (2
> pot chimney) or any similar kind of 2 pot stove( natural convection)
>
> Cheers
> Sarbagya Tuladhar
>
> Sent from my iPhone
>
> On 21/03/2012, at 2:42 PM, Anand Karve <adkarve at gmail.com> wrote:
>
>   Dear Mr. Tuladhar,
>  One can generalise that the air entering the stove goes out through the
> pot hole and the chimney. There are stoves in which the volume of
> air entering the stove through the grate is reduced while that of the
> scondary air entering the stove through the firemouth is enhanced. There
> are also stoves in which the pot sits flush on the stove, so that all the
> outgoing air has to pass through chimney. But there are also chimneyless
> stoves. Thus, the amount of air entering or leaving the stove through
> various inlets and outlets and their velocities depend very much on the
> stove design.
> Yours
> A.D.Karve
>
>
>
> On Mon, Mar 19, 2012 at 1:34 PM, Sarbagya Tuladhar <sarbagya007 at gmail.com>wrote:
>
>> Hi Stovers,
>>
>> Just veering off the topic of dung for a moment, has anyone got any kind
>> of data on the air velocity for natural convection stoves.. Any kind of
>> data would be useful ? Could be air velocity at the cooktops or the chimney
>> ? I suppose the max velocity would be at the chimney area due to the
>> chimney effect (draft)..
>>
>> Cheers
>>
>> Sarbagya
>>
>> On Mon, Mar 19, 2012 at 4:27 PM, Sarbagya Tuladhar <sarbagya007 at gmail.com
>> > wrote:
>>
>>> Interesting indeed. However stink is not as much a problem when dried
>>> completely. Even with the dung briquettes, the stink is no more when dried.
>>> However, the case with pyrolyzing the dung and releasing the hamrful
>>> toxins, if the smoke and aroma can be removed then thats certainly worth a
>>> try. Any more info on Francis of Kenya ?
>>>
>>> Cheers
>>> Sarbagya
>>>
>>>  On Mon, Mar 19, 2012 at 12:16 PM, Richard Stanley <
>>> rstanley at legacyfound.org> wrote:
>>>
>>>> This is interesting. Out in Miumbuni village, about 2hrs east of
>>>> Nairobi and another hr off the Mombassa road, is a one Francis Kavita who
>>>> has been working with the Masaai in developing cow dung based briquettes
>>>> that do not stink: He has developed same with elephant dung in south
>>>> Eastern Kenya (near Tasavo)  and is now breaking ground with camel dung
>>>> based blends for use in the refugee camps in Somalia. He has tested them
>>>> and he says the work well without smoke or aroma.
>>>> He has no numbers for
>>>> what he ahas done but is still far more experience than anyone else,
>>>> including all the Phd students we know of. If he says it will work I
>>>> believe it:
>>>>
>>>> We started him in briquette making in 1999, and trained he and his wife
>>>> Mary in 2007 as trainers and they have been all over east Africa training
>>>> others–on their own–, ever since.  The problem is not that it works or does
>>>> not work, Its a case of what we need to be convinced of it. The Phd study
>>>> or   Francis' experience. After all he only has a 4th grade education.
>>>>
>>>> Alternatively, can we evolve a more balanced discovery model with due
>>>> respect for the unique contributions of knowledge and experience that *
>>>> both* have to offer.
>>>>
>>>> Richard Stanley
>>>> www.legacyfound
>>>> ==========
>>>>
>>>>
>>>>
>>>>  On Mar 16, 2012, at 9:26 PM, SARBAGYA TULADHAR wrote:
>>>>
>>>> Hi Stovers,
>>>>
>>>> I am undertaking my uni graduate project on the  Use of CFD for the
>>>> study of heat transfer and convection in a Dung Burning Cookstove. With
>>>> this project, a heat transfer and convection analysis would be carried out
>>>> using Computational Fluid Dynamics (CFD) for the optimization of dung
>>>> burning cooktove that is currently being developed in Nepal. The analysis
>>>> would involve simulation to predict the performance of the cookstove and
>>>> would set up a benchmark for improved stove manufacturing in Nepal. This
>>>> analysis would also assist in providing the experimental and the simulation
>>>> results towards getting the stove certified as an “Improved Cookstove”.
>>>>
>>>> However to simulate the dung burning I had to resort to using the fixed
>>>> heat source instead as modeling combustion/pyrolysis of dung was beyond the
>>>> scope of the project. So what could be the heat output from burning 1 kg.
>>>> of dung. How mush heat would be released from this ? Is that the calorific
>>>> value dung ? As I would be using a fixed temperature heat source, what
>>>> could be that temperature ?
>>>>
>>>> Cheers
>>>>
>>>> Sarbagya Tuladhar
>>>>
>>>>  On 13/02/2012, at 2:27 AM, Anand Karve wrote:
>>>>
>>>>  Dear Richard,
>>>>  The undigested solid matter in the dung is in fact the lignocellulosic
>>>> matter, However, in the case of ruminents, it is not in a fibrous form but
>>>> in the form of particles due to the practice of chewing the cud.  It is the
>>>> dung of non-ruminents, like horses and elephants that has fibres.
>>>> Yours
>>>> A.D.Karve
>>>>
>>>> On Sat, Feb 11, 2012 at 11:30 PM, Richard Stanley <
>>>> rstanley at legacyfound.org> wrote:
>>>>
>>>>> Ad,
>>>>>
>>>>>  I don't personally think the solids would be of much value for a good
>>>>> briquette:  What I would look for personally, is  your lignocellulosic
>>>>> material, ( the more fibrous stuff)  to encapsulate other more carbon rich
>>>>> salt free, materials sawdust charcoal crumbs/ dust, selected agro residues
>>>>> with aromatic-or non aromatic- considerations depending upon what kind of
>>>>> fuel aroma and duration of heat you desire.
>>>>>
>>>>> Richard Stanley
>>>>>
>>>>>
>>>>>  On Feb 10, 2012, at 9:36 PM, Anand Karve wrote:
>>>>>
>>>>> Cattle dung consists mainly of non-digestible lignocellulosic
>>>>> material, millions of micro-organisms, mucus produced by the animals and
>>>>> by the microbes, and some minerals. In fact it is the microbes and the
>>>>> mucus in the dung that yield biogas on anaerobic fermentation.
>>>>> A pressurised sieve, technically called a filter press, is the best device
>>>>> for separating the non-soluble solids from the fluids. If the fluids
>>>>> contained the microbes and the mucus, they should be subjected to anaerobic
>>>>> digestion before allowing them to be used as manure.  Dung also has a very
>>>>> high ash content, because of which its calorific value is rather low. Dry
>>>>> dung has calorific value of about 3500 kcal/kg.  Has anybody measured the
>>>>> calorific value of the solids in the dung, after removal of the fluids from
>>>>> it by using a filter press?
>>>>> Yours
>>>>> A.D.Karve
>>>>>
>>>>> On Sat, Feb 11, 2012 at 8:27 AM, Sarbagya Tuladhar <
>>>>> sarbagya007 at gmail.com> wrote:
>>>>>
>>>>>>  Hi Boston
>>>>>>
>>>>>>
>>>>>> I volunteered with EWB Australia in Nepal working on a clean dung
>>>>>> burning stove and thus worked with the dung as a fuel . Washing of the dung
>>>>>> was done and briquettes which was a real success. Paper pulp used as a
>>>>>> binder worked really well. Also the chloride contents of the dung which is
>>>>>> responsible for watery eyes was removed on washing the dung which was
>>>>>> proven by the copper wire test. We even fabricated a simple dung press for
>>>>>> the same. The liquid portion of the dung was reutilised as manure in the
>>>>>> fields. Thus the whole sceptism about "should" use dung as manure in the
>>>>>> fields and not as a cooking fuel was somewhat solved. Did not test the NPK
>>>>>> contents of the liquid portion though...
>>>>>>
>>>>>> Sarbagya
>>>>>>
>>>>>> Sent from my iPhone
>>>>>>
>>>>>> On 11/02/2012, at 2:06 AM, Boston Nyer <bostonnyer at gmail.com> wrote:
>>>>>>
>>>>>>  Hello,
>>>>>>
>>>>>> I'm looking to clean/rinse cow dung and do not have any experience
>>>>>> doing so.  Does anyone have any experience cleaning dung and would like to
>>>>>> share?
>>>>>>
>>>>>> Thank you!
>>>>>> Boston
>>>>>>
>>>>>> --
>>>>>> Boston
>>>>>>  Skype: BostonNyer
>>>>>> Cell: (585) 503-3459
>>>>>> www.burndesignlab.org
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ***
>>>>> Dr. A.D. Karve
>>>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>>>> (ARTI)
>>>>>
>>>>>
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>>>>
>>>>
>>>> --
>>>> ***
>>>> Dr. A.D. Karve
>>>> Trustee & Founder President, Appropriate Rural Technology Institute
>>>> (ARTI)
>>>>
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>>>
>>
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>
>
> --
> ***
> Dr. A.D. Karve
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
>
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-- 
***
Dr. A.D. Karve
Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
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