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 <[email protected]>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 <[email protected]> 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 > <[email protected]>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 <[email protected] >> > 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 < >>> [email protected]> 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 < >>>> [email protected]> 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 < >>>>> [email protected]> 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 <[email protected]> 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 >>>>>> >>>>>> _______________________________________________ >>>>>> 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/ >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> 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/ >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> *** >>>>> Dr. A.D. Karve >>>>> Trustee & Founder President, Appropriate Rural Technology Institute >>>>> (ARTI) >>>>> >>>>> >>>>> _______________________________________________ >>>>> 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/ >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> 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/ >>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> *** >>>> Dr. A.D. Karve >>>> Trustee & Founder President, Appropriate Rural Technology Institute >>>> (ARTI) >>>> >>>> >>>> _______________________________________________ >>>> 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/ >>>> >>>> >>>> _______________________________________________ >>>> 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/ >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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/ >>>> >>>> >>>> >>> >> >> _______________________________________________ >> 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/ >> >> >> > > > -- > *** > Dr. A.D. Karve > Trustee & Founder President, Appropriate Rural Technology Institute (ARTI) > > > _______________________________________________ > 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/ > > > _______________________________________________ > 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/ > > > -- *** Dr. A.D. Karve Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
_______________________________________________ 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/
