Crispin - cc Stoves: Does your "Toolkit" include a proposal for how one should report the efficiency of char-making in a cookstove?
Ron ----- Original Message ----- From: "Crispin Pemberton-Pigott" <[email protected]> To: "Discussion of biomass cooking stoves" <[email protected]> Sent: Sunday, April 21, 2013 11:15:33 AM Subject: Re: [Stoves] Major stove-test proposal Dear Paul Further to this I can report that there is significant progress on systematising this proposal into the form of a Standard with three sections, or three titles that biomass combusting devices naturally fall into. In fact that could even be refined further by saying that there are three testing approaches that provide comparisons contained in one methodology. They are: devices that heat water only (which is so common that they can be specifically tuned for that alone); devices that are used for cooking (they can be controlled enough to give a cook a good cooking experience with enough power and controllability); and comparative testing where an absolute measure is not required, but which tests one stove against another doing exactly the same thing (usually for determining the relative performance of a locally or culturally relevant task). The measurements are based on a determination of what constitutes a decent and acceptable cooking experience, which of course varies from region to region. Working back from that, it is possible to set certain targets for performance that are scientifically rooted and defined. The definitions required are being compiled at this time. A few people have been asked for input and then I will circulate it further. It is very much open for discussion. The Stove Testing Toolbox is a set of agreed methods with their attendant definitions and metrics, each of which exists independently and is valid on its own. At the moment there are two ‘tools’ that seem to be well defined enough to work well. One is for determining the heat transfer efficiency of a hot stove at high power and the other is for determining the average heat transfer efficiency over a long burn at one or more power levels including ignition. The latter captures the influence of the thermal mass of a heavy stove – something building into the Chinese National Standard at the moment though it does so in a manner that has not been examined in much detail. Emissions are easily added to the TET numbers based on the mass emitted per net MJ in the pot. Determining the MJ in the pot of a wok or for frying has been a problem. This has been addressed. The thermal efficiency tests (TET) are similar to the BS, Indian and SeTAR tests meaning they track the heat transferred including the Cp of the pot. More details will follow when the documentation is organised. Regards Crispin This was not cross-posted to the biochar list +++++++ Stovers and biochar folks. The message below and attachment were sent but not distributed (because of too many other recipients). That explains why there was so little discussion!! I consider this document to be highly important. So here it is, a month late but still to be read. Paul S. Anderson, PhD aka "Dr TLUD" Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 Website: www.drtlud.com -------- Original Message -------- Subject: Major stove-test proposal Date: Thu, 21 Mar 2013 18:41:54 -0500 From: Paul Anderson <[email protected]> To: Discussion of biomass cooking stoves <[email protected]> , "[email protected]" <[email protected]> , Hugh McLaughlin <[email protected]> , Bob Fairchild <[email protected]> , Noeli Anderson <[email protected]> , Doc Anderson <[email protected]> , Ranyee Chiang <[email protected]> Dear All, Here at the GACC Forum, a truly major proposal about adjustments of stove-testing method has been made. It is just beginning to reach those who should be involved. Feel free to forward the attached document to others. And I understand that some additional proposals are being formulated, but I have no details on them. I will send further comments eventually, but you can start discussions. The conference is very productive. Including some truly meaningful TLUD progress!!! Paul -- Paul S. Anderson, PhD aka "Dr TLUD" Email: [email protected] Skype: paultlud Phone: +1-309-452-7072 Website: www.drtlud.com _______________________________________________ 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/
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