Thanks a lot Marc...will chk it out...actually it's just an approximation at this stage as i need some data to go ahead with the convergence test for the CFD modeling
Cheers Sarbagya Sent from my iPhone On 21/03/2012, at 7:27 PM, Marc Pare <[email protected]> wrote: > Sarbagya, > > You might check out this page to get you started on a theoretical estimate: > http://www.cookstove.net/comb-chamb-design/air-supply.html > It focuses on the stove types you just mentioned. > (I can't speak for cookstove.net's accuracy, but it will at least get you > started) > > For our back-of-the-enveloped calculations, we would use a combination of > stack effect, stoichiometric air requirement, and excess air. Worked well > enough for our purposes (design by negative selection), but won't be enough > for quantitiative modeling. > > Marc Paré > B.S. Mechanical Engineering > Georgia Institute of Technology | Université de Technologie de Compiègne > > my cv, etc. | http://notwandering.com > > > On Wed, Mar 21, 2012 at 2:42 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/ > > > > _______________________________________________ > 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/ >
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