Crispin, I do not have that information. I did that 3 years ago. Also I did not use my best burner. I need to get back to that design it has potential. Lanny ----- Original Message ----- From: Crispin Pemberton-Pigott To: 'Discussion of biomass cooking stoves' Sent: Sunday, July 28, 2013 5:14 PM Subject: Re: [Stoves] Pot shells / Fin shells
Dear Lanny The problem is the missing figure is the mass of fuel when the pot as boiled so I can't get an efficiency without making some (big) guesses. If the energy needed to simmer the rice for 30 minutes is 20% of the boiling energy, the system efficiency (which is the analogy of fuel efficiency) is 34%, conditioned on the following: If the charcoal remaining is useable in the next fire, it can be treated as 'unused fuel'. If you want an accurate figure, you would have to use this duel in a new fire and get the performance so that the amount of char remaining is the same as what you put in during that burn. The 34% figure assumes the char is not burnable in the next fire. If it is (all of it) the system efficiency is 51% based on the simmering assumption. It should be remembered that the thermal efficiency should consider the thermal mass of the pot (mass x specific x change in temperature. If it does, the reported figure will be higher. Regards Crispin From: Stoves [mailto:[email protected]] On Behalf Of Lanny Henson Sent: Sunday, July 28, 2013 3:37 PM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] Pot shells / Fin shells Well I had 186 LB of water and rice, the rice was 50 lb. Rice has a specific heat capacity of about .33 which is about the same as 16.5 of water so deduct 33.5 from 186 for a mass of about 152.5 lb water equivalent. I started with 15 LB. of wood and had 2.95 LB. left over = 12.05 LB. of wood used, and there was 1.5 LB. of charcoal left. The simmer time was about 30 min. The wrapper is 60" x and the vat is 48" long . I estimate the water was contacting about 36" of the 60" wrapper so the contact area was about 12 sq. ft. Does that give you the numbers you need? Lanny ------------------------------------------------------------------------------ _______________________________________________ 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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