Use an aluminum plate!
One problem would be the size of the char and the fact there is unburned torrefied wood inside some char. It won't crush easily. It is a reason the error on the estimated heat value in the char is large. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Kevin Sent: Wednesday, December 05, 2012 12:09 AM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Equipment required for testing stoves Dear Frank What about 2 steel pie plates? Put char in one and cover with the other. If char was very hot, to enhance cooling rate, set the bottom plate on a paper towel soaked in water, and spray the top plate with a water mist. Best wishes, Kevin ----- Original Message ----- From: Frank Shields <mailto:[email protected]> To: 'Discussion of biomass cooking stoves' <mailto:[email protected]> Sent: Tuesday, December 04, 2012 5:14 PM Subject: Re: [Stoves] Equipment required for testing stoves Paul, I like the vase. And having a pot of water on top collecting 'energy' as the WACW cools seems like a great method of measuring energy loss during the cooling that can be added on to the values determined from a ground and tested WACW. Wonder if that would work - Crispin? Frank From: Stoves [mailto:[email protected]] On Behalf Of Paul Olivier Sent: Tuesday, December 04, 2012 12:41 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Equipment required for testing stoves Frank, Getting an accurate dry weight of biochar is indispensable in being able to sell it. If we douse the biochar with water, then we no longer have an accurate measurement of dry weight. Also biochar right out of the gasifier contains valuable heat that could be used in keeping food warm. Therefore I designed a terracotta vase to contain the hot biochar. A pot placed on top of the vase prevents oxygen from entering. The vase shown in the drawing below can hold six liters of biochar. This is the volume of rice hull biochar produced in my 150 gasifier. https://dl.dropbox.com/u/22013094/150%20Gasifier/Terrecotta%20Vase/Drawing/T erracotta%20Vase.pdf Thanks. Paul Olivier On Wed, Dec 5, 2012 at 3:20 AM, Frank Shields <[email protected]> wrote: Hi Crispin, Weighing the fuel when removed (hot and burning) and dry weight after soaking with water, draining (screen) and drying is not a convenient procedure to determine moisture left -and prone to error - but only method I can think of at the moment. Water puts out a fire by taking away its heat. So wondering if there is another method that could be used? Combination nitrogen gas and pieces of steel in a tumbler? Must be some way besides water. Frank Frank Shields Control Laboratories, Inc. 42 Hangar Way Watsonville, CA 95076 (831) 724-5422 tel (831) 724-3188 fax www.biocharlab.com -----Original Message----- From: Stoves [mailto:[email protected]] On Behalf Of Crispin Pemberton-Pigott Sent: Tuesday, December 04, 2012 11:26 AM To: Stoves Subject: Re: [Stoves] Equipment required for testing stoves Dear Frank You are on the right track, in my view. The assumed energy for the wood and char is a major source of imprecision in the test. As for quenching with water: unfortunately we need to know the residual moisture content of the fuel 'as removed'. That varies a lot depending on the stove type. Quenching it with nitrogen is an alternative. Regards Crispin -----Original Message----- From: "Frank Shields" <[email protected]> Sender: "Stoves" <[email protected]> Date: Tue, 4 Dec 2012 10:19:39 To: 'Discussion of biomass cooking stoves'<[email protected]> Reply-To: Discussion of biomass cooking stoves <[email protected]> Subject: [Stoves] Equipment required for testing stoves _______________________________________________ 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 <http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylist s%0A.org> .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 <http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylist s%0A.org> .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/ -- Paul A. Olivier PhD 27/2 Phu Dong Tieng Vuong Dalat Vietnam Louisiana telephone: 1-337-447-4124 (rings Vietnam) Mobile: 090-694-1573 (in Vietnam) Skype address: Xpolivier http://www.esrla.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://www.bioenergylists.org/
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