Erich, Lanny, in Nairobi they sell nearly 1.5kgs charcoal for 70 Kenyan Shillings (KES). At the current rate of exchange one must pay approx. 52 US-Cents for one kg. This price was found last week. Just for your orientation.
| Bernhard Müller | Mühlstraße 26 | 65760 Eschborn | Allemagne - Germany - Deutschland | Fon +49 160 9498 9966 | http://www.mueller-solartechnik.com > Gesendet: Donnerstag, 03. Oktober 2013 um 20:00 Uhr > Von: [email protected] > An: [email protected] > Betreff: Stoves Digest, Vol 38, Issue 3 > > Send Stoves mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > > http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org > > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Stoves digest..." > > > Today's Topics: > > 1. Re: NE Biochar takes the C-cake (Lanny Henson) > 2. Re: Water heating fuel efficiency formula ([email protected]) > 3. Re: Water heating fuel efficiency formula (Ronal W. Larson) > 4. Re: Water heating fuel efficiency formula (Jock Gill) > 5. Jompy water heater deserves your consideration Re: Siemens > Empowering people award (Paul Anderson) > 6. Re: Water heating fuel efficiency formula > (Crispin Pemberton-Pigott) > 7. Re: Water heating fuel efficiency formula > (Crispin Pemberton-Pigott) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 2 Oct 2013 17:48:48 -0400 > From: "Lanny Henson" <[email protected]> > To: <[email protected]>, "Discussion of biomass > cooking stoves" <[email protected]> > Subject: Re: [Stoves] NE Biochar takes the C-cake > Message-ID: <019ACB2A3B5E453CAF14453F5A884A7C@HP> > Content-Type: text/plain; charset="iso-8859-1" > > Erich, > I am impressed!! Wow! > I love the scene with fire that was amazing. Thanks of amusing me! > You may be missing out of on an opportunity to create microenterprise and > jobs. > You could set up venders at flea markets and sell 50 LB bags of that char for > $20 all day long! It is almost $1 a pound at the big box stores. > There are a lot of grilling and smoke roasting barbecue people that would > love to buy it. If you were local I would buy some. > You could save the small stuff for biochar and use the money from sales of > the larger pieces to expand and make more biochar. > This has been an idea on the back burner for years. If it works I may jump > in. > Lanny > > ----- Original Message ----- > From: Erich Knight > To: Discussion of biomass pyrolysis and gasification ; > [email protected] > Sent: Wednesday, October 02, 2013 10:40 AM > Subject: [Stoves] NE Biochar takes the C-cake > > > Look where the Adam Retort has gone, from charcoal for cooking fuel to > greenhouse heating and biochar production. > > > > ---- > > New England Biochar takes the C-cake, and eats it too. > > Bob Wells is GooD Stuff himself. > > What a great set up they have. Open sheds for the reactors right next to > the Greenhouses, > > Slick As ....ya know....well.... Biochar. > > Love the overly dramatic fiery explosive transformation for the moment of > pyrolitic conversion. > > New England Biochar > http://www.youtube.com/watch?v=gwNPtWff9QA > > See New England Biochar http://newenglandbiochar.org/ > > Erich Knight > > > > ------------------------------------------------------------------------------ > > > _______________________________________________ > 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://stoves.bioenergylists.org/ > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20131002/453dceb8/attachment-0001.html> > > ------------------------------ > > Message: 2 > Date: Thu, 03 Oct 2013 08:07:55 +0100 > From: [email protected] > To: Discussion of biomass cooking stoves > <[email protected]> > Subject: Re: [Stoves] Water heating fuel efficiency formula > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > [Default] On Sun, 29 Sep 2013 14:41:32 -0400,"Lanny Henson" > <[email protected]> wrote: > > >I need the formula or spread sheet, for fuel efficiency, for heating water, > >considering the moisture content of wood, and using red oak as fuel. Not a > >water boiling test with simmering, just a water heating test. > > Lanny > > What form do you want this to take? > > My guess is red oak will have a calorific content of around the 18.6 > MJ per kilo average suggested for most biomass. When you burn it > completely it gives off CO2 and water. All the water, both the > original moisture content and the water formed from oxidising the > hydrogen atoms in the fuel, in the exhaust contains 2.3MJ of latent > heat and the sensible heat from the exhaust temperature. This heat in > water vapour and the sensible heat of the other exhaust gasses, mostly > nitrogen, any remaining oxygen from the excess air and CO2, is waste > heat, the other waste heat is the heat conducted, radiated and > convected from the stove body. The remainder, the usable heat is what > gets into the pot. > > The simplest conversion of the potential heat in the wood to usable > heat in the pot is to weigh the wood used, calculate its heat value > and measure the rise in temperature of the pot contents and calculate > the heat input. Divide the first by the second value and you have an > overall wood to pot efficiency as a first approximation. > > Beyond that you get into the realms of interminable arguments about > whether to allow for residual energy in any char left and how many > fairies can dance on a pin head. > > AJH > > > > ------------------------------ > > Message: 3 > Date: Thu, 3 Oct 2013 07:14:05 -0600 > From: "Ronal W. Larson" <[email protected]> > To: Discussion of biomass cooking stoves > <[email protected]>, Andrew Heggie > <[email protected]> > Subject: Re: [Stoves] Water heating fuel efficiency formula > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > Andrew: cc list and Lanny > > This is the first time I can recall seeing the number 2.3 MJ/kilo. This > must be associated with some initial moisture? > > I think Lanny is looking for ways to do testing with wood of different > moisture content. Doesn't he have to do some wood drying in an oven, > measuring weight loss? > > Ron > > > On Oct 3, 2013, at 1:07 AM, [email protected] wrote: > > > [Default] On Sun, 29 Sep 2013 14:41:32 -0400,"Lanny Henson" > > <[email protected]> wrote: > > > >> I need the formula or spread sheet, for fuel efficiency, for heating > >> water, > >> considering the moisture content of wood, and using red oak as fuel. Not > >> a > >> water boiling test with simmering, just a water heating test. > > > > Lanny > > > > What form do you want this to take? > > > > My guess is red oak will have a calorific content of around the 18.6 > > MJ per kilo average suggested for most biomass. When you burn it > > completely it gives off CO2 and water. All the water, both the > > original moisture content and the water formed from oxidising the > > hydrogen atoms in the fuel, in the exhaust contains 2.3MJ of latent > > heat and the sensible heat from the exhaust temperature. This heat in > > water vapour and the sensible heat of the other exhaust gasses, mostly > > nitrogen, any remaining oxygen from the excess air and CO2, is waste > > heat, the other waste heat is the heat conducted, radiated and > > convected from the stove body. The remainder, the usable heat is what > > gets into the pot. > > > > The simplest conversion of the potential heat in the wood to usable > > heat in the pot is to weigh the wood used, calculate its heat value > > and measure the rise in temperature of the pot contents and calculate > > the heat input. Divide the first by the second value and you have an > > overall wood to pot efficiency as a first approximation. > > > > Beyond that you get into the realms of interminable arguments about > > whether to allow for residual energy in any char left and how many > > fairies can dance on a pin head. > > > > AJH > > > > _______________________________________________ > > 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://stoves.bioenergylists.org/ > > > > > > > ------------------------------ > > Message: 4 > Date: Thu, 03 Oct 2013 09:37:03 -0400 > From: Jock Gill <[email protected]> > To: Discussion of biomass cooking stoves > <[email protected]> > Subject: Re: [Stoves] Water heating fuel efficiency formula > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > Gents, > > While efficiency is certainly an interesting concept, it will be deeply > influenced by the shape of the pot as well as the location of the pot. I > find that a flat bottom container set inside a closed kettle (domed container > such as a modified Weber grill), boils water beautifully. The benefit is that > ALL surfaces of the pot and the top surface of the water are exposed to > temperatures above 350 degrees F. The temperature of the exhaust gases > exceeds 400 degrees F. > > Further, set to the side, not directly over the heat source, I can simmer the > water while I cook over the heat source. Or I can boil water over the heat > source and slow cook food at about 350 degrees F in the off center portions > of the grill. > > How would we measure the efficiency of such a system, an iCan TLUD, that > provides useful heat for about 70 minutes from about 3 pounds of wood pellets > and also harvests almost 20% of the weight of the feed stock as charcoal? > > I note that the system I use does not deposit soot on either the pots or the > food. So clean up is much easier. Pots can stay shiny after use. I will > have a 12 page PDF on all of this next week. > > In the end, I think cooks are going to be more interested in the cooking > methods and results than just about anything else. If we want a stove to be > adopted, the operation of the stove has to be straight forward and the food > simply has to taste significantly better than the alternatives. Have we yet > considered taste tests as a crucial metric for evaluating stoves? And, of > course, I would also like to see gardening tests done with the residues > created by stoves. Are some residues more valuable than others? What are the > differences? Are residues waste products of low value or are they high value > co-products? > > Just what are the benefits that will convince a person to adopt a new cooking > technology? Are they compelling enough to convince a customer at the top of > the pyramid - at least for back yard and deck cooking? > > Regards, > > Jock > > Jock Gill > P.O. Box 3 > Peacham, VT 05862 > > Cell: (617) 449-8111 > > :> Extract CO2 from the atmosphere! <: > > Sent from my iPad > > > On Oct 3, 2013, at 3:07 AM, [email protected] wrote: > > > > [Default] On Sun, 29 Sep 2013 14:41:32 -0400,"Lanny Henson" > > <[email protected]> wrote: > > > >> I need the formula or spread sheet, for fuel efficiency, for heating > >> water, > >> considering the moisture content of wood, and using red oak as fuel. Not > >> a > >> water boiling test with simmering, just a water heating test. > > > > Lanny > > > > What form do you want this to take? > > > > My guess is red oak will have a calorific content of around the 18.6 > > MJ per kilo average suggested for most biomass. When you burn it > > completely it gives off CO2 and water. All the water, both the > > original moisture content and the water formed from oxidising the > > hydrogen atoms in the fuel, in the exhaust contains 2.3MJ of latent > > heat and the sensible heat from the exhaust temperature. This heat in > > water vapour and the sensible heat of the other exhaust gasses, mostly > > nitrogen, any remaining oxygen from the excess air and CO2, is waste > > heat, the other waste heat is the heat conducted, radiated and > > convected from the stove body. The remainder, the usable heat is what > > gets into the pot. > > > > The simplest conversion of the potential heat in the wood to usable > > heat in the pot is to weigh the wood used, calculate its heat value > > and measure the rise in temperature of the pot contents and calculate > > the heat input. Divide the first by the second value and you have an > > overall wood to pot efficiency as a first approximation. > > > > Beyond that you get into the realms of interminable arguments about > > whether to allow for residual energy in any char left and how many > > fairies can dance on a pin head. > > > > AJH > > > > _______________________________________________ > > 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://stoves.bioenergylists.org/ > > > > > > ------------------------------ > > Message: 5 > Date: Thu, 03 Oct 2013 11:50:24 -0500 > From: Paul Anderson <[email protected]> > To: Discussion of biomass cooking stoves > <[email protected]> > Cc: David Osborne <[email protected]> > Subject: [Stoves] Jompy water heater deserves your consideration Re: > Siemens Empowering people award > Message-ID: <[email protected]> > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" > > Stovers and appropriate technology buffs, > > Please read the Jompy message below and consider voting. What I found was: > a. the 23 candidates have very interesting technologies of interest to > many of us. > > b. Some are "kookie" and even prototype or with limitations such as > high cost per unit or Thermal Acoustic Electric output but only for a > couple of LEDs. And some are imaginative. I enjoyed reading about them. > > c. Of them, the Jompy water heater is a true leader and could win one > of the three big prizes if a few more of us vote. I actually had > trouble deciding on the other two to receive votes. Required to vote > for 3. > > d. I have known the Jompy unit from favorable personal experience in > Africa and I am very pleased that David Osborne's creation is one of the > candidates. > > e. Note that the shape of the Jompy is quite compatible with the size > and shape of the concentrator disk/plate in the TLUD stoves by Wendelbo > (Peko Pe) and Anderson (Champion, Mwoto, Quad). (That could be important > some day, but that is not why I voted for it.) > > Please consider voting, and I hope you will vote for the Jompy. Deadline > for voting is not clear, but probably only another week or two to vote. > > Paul > > Doc / Dr TLUD / Prof. Paul S. Anderson, PhD > Email: [email protected] > Skype: paultlud Phone: +1-309-452-7072 > Website: www.drtlud.com > > On 10/1/2013 5:08 PM, David Osborne wrote: > > Hi Everyone, > > We have some exciting news on the Jompy water boiler we have been > > chosen as one of the 23 finalists of the Siemens Empowering people > > award. we would love if you could take a few minutes of your time and > > vote for the Jompy on the link below (you have to choose 3 projects to > > vote ) > > > > */http://www.empowering-people-award.siemens-stiftung.org/en/shortlist/projects/jompy-water-boiler//* > > > > The "empowering people. Award -- Technologies for basic needs" was > > launched to identify and to showcase appropriate technical solutions > > for the development context worldwide. > > > > *The Award* > > Technologies that make development more sustainable are available > > today - the challenge lies in deploying them in the right way. Part of > > the problem is often a lack of resources and knowledge, which makes it > > more difficult to identify the adequate solution for a specific problem. > > > > Here the "empowering people. Award" plays a key role. The Award called > > upon developers worldwide to enter efficient technical solutions, > > which tackle key challenges in the basic supply in developing > > countries. The call was aimed at innovations in the categories Water & > > Waste Water, Energy, Waste Management & Recycling, Healthcare, Food & > > Agriculture, Housing & Construction, and Information & Communication > > Technology. When the virtual entry portal of the competition closed on > > January 31^st 2013, over 800 entries could be counted from over 90 > > countries around the globe. These were examined, evaluated and > > shortlisted by specialists on technology and development work. An > > international expert jury > > <http://www.empowering-people-award.siemens-stiftung.org/en/award/jury/> > > awarded > > prize money worth 50,000, 30,000 and 20,000 Euro, in order to foster > > the further development of their solutions and/or the implementation > > of their projects. Twenty projects will receive a smaller amount of > > 5,000 Euro each. > > > > *Community Voting* > > As the "empowering people. Award" is about creating a community with > > an interest in technical solutions in the area of development > > cooperation, everybody has a say in the winners' selection. By > > participating in the Community Voting, the public can additionally > > select its own favourite candidate amongst the 23 finalists. The > > winner of this special Community Prize can select a prize from > > different communications hardware opions such as a computer, a > > video-camera or a smartphone, according to his/her project needs > > (value up to 3,000 Euro > > > > > > Many Thanks > > > > Claire Osborne > > Celsius Plumbing & Heating > > 01292 318194 > > www.celsius-plumbingandheating.co.uk > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://lists.bioenergylists.org/pipermail/stoves_lists.bioenergylists.org/attachments/20131003/1fc05900/attachment-0001.html> > > ------------------------------ > > Message: 6 > Date: Fri, 4 Oct 2013 00:20:43 +0700 > From: "Crispin Pemberton-Pigott" <[email protected]> > To: "'Discussion of biomass cooking stoves'" > <[email protected]> > Subject: Re: [Stoves] Water heating fuel efficiency formula > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Dear Jock > > >How would we measure the efficiency of such a system, an iCan TLUD, that > provides useful heat for about 70 minutes from about 3 pounds of wood > pellets and also harvests almost 20% of the weight of the feed stock as > charcoal? > > The system efficiency (which is the work energy divided by the available > fuel energy) is well known for good reasons. It predicts fuel consumption in > future for a similar task, and is a way to rate different technologies with > access to the same amount of the same fuel. > > The rating of the energy performance has to consider whether or not the fuel > left over is useable tomorrow. A good example is an open fire burning > sticks. Each morning the fire is lighted using the wood left over from > yesterday. Maybe the charcoal is left to burn out each night. That has to be > considered as well - if it is burned it is not available tomorrow so it is > consumed even if it did no work. Local behaviour matters when considering > what stove to promote. > > The actual heat available (the effective heating value) is the potential a > stove could get from a given mass of wood with a given moisture content and > elemental analysis. > > The stove may not yield that heat for a variety of reasons which I should > not need to enumerate. If it does not, it is not rewarded with a 'better' > number. If the work done, say, boiling water, remains the same, then it is > not reasonable to reduce the amount of heat available and then say the stove > did a better job because the ratio of the work done to heat yielded is > better. Doing a lousier job of burning the fuel, or making use tomorrow of > what remains today, cannot give a stove a 'better' rating. > > For all these reasons, the fact that there is char remaining at the end of a > cooking cycle is not a bonus for the thermal performance of a cooking > system. > > When using a fuel that is a non-woody biomass, there are good arguments for, > not special consideration, but for a reduction in the requirement for > efficiency. This is reasonable if there is a surplus of an unused resource > and a scarcity of a used one. So the argument that there should be a > 'special' way to calculate the efficiency will not fly. But there is a > chance that pleading a special case based on fuel availability could in > principle succeed. > > In the negotiations on this matter, it is not possible to sell the idea that > a stove that uses more wood than the baseline should be promoted, > particularly on a subsidised basis. It is a much easier sell to show that > there is an unused resource that can 'inefficiently' be used but that will > provide some additional benefits (real, not potential). > > As for emissions into the home the usual standard would apply of course. It > has to be clean burning. > > Regards > Crispin > > > > > > ------------------------------ > > Message: 7 > Date: Fri, 4 Oct 2013 00:20:43 +0700 > From: "Crispin Pemberton-Pigott" <[email protected]> > To: "'Discussion of biomass cooking stoves'" > <[email protected]> > Subject: Re: [Stoves] Water heating fuel efficiency formula > Message-ID: <[email protected]> > Content-Type: text/plain; charset="us-ascii" > > Dear Ron and Andrew and Lanny > > RON >This is the first time I can recall seeing the number 2.3 MJ/kilo. > This must be associated with some initial moisture? > > It has to be the heat loss for a 'typical' exhaust temperature. > > The HHV-1.32 MJ/kg is often given as the LHV value though it is not really > calculated correctly. The correct 'common' or 'average' value would be > HHV-1.38 but there is not use protesting it because the other method is so > entrenched. > > 2.3 would include some heat in gases above 100C. The HVAC and boiler > industry in the US uses 150 C as the minimum useable exhaust temperature so > the 1.32 does not apply in that case. > > An 'efficiency' is a ratio. There are many efficiencies in a stove. > > The system efficiency is perhaps the best description for the work > done/energy theoretically available. > > Another efficiency is take (the work done/(energy theoretically available x > combustion efficiency)) where combustion efficiency really means the % of > heat that was not lost to unburned gases. > > Yet another is the potential heat x the combustion efficiency considering > also the mechanical losses to arrive at the actual heat available from the > fire. This can be used to determine the actual firepower for space heating > and cooking considerations. If the heat gained by the pot including the pot > material and what is inside it is divided by that number, you get the heat > transfer efficiency. That can be useful for tuning the stove's performance. > > If you want a measure of fuel efficiency, and to be able to predict the fuel > consumption in future, you want the system efficiency which is also the > easiest to calculate. That tells you how efficiently the fuel resource is > being applied to the 'work' of cooking. > > Regards > Crispin > > > > > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > 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/ > > > ------------------------------ > > End of Stoves Digest, Vol 38, Issue 3 > ************************************* > _______________________________________________ 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://stoves.bioenergylists.org/
