Crispin. With ccs. (think you wanted the list) Thanks.
You ask some good questions below. Dean Still can perhaps answer. I am amazed at the 20% char value below. Hmm. Ron On Feb 19, 2013, at 6:26 PM, "Crispin Pemberton-Pigott" <[email protected]> wrote: > Dear Ron > > [RWL: I'd like to hear your set of differences. I wonder where this fits > in the range described by Nordica at last ETHOS meeting in terms of dimension > ratios.] > > I have found the exact description of a Rocket Stove somewhat elusive. In > this case we see a company called Rocket Works making a stove that is a > side-fed stick burner, but that is hardly a rare or novel description. It > does not follow Larry's description of 'how to design a stove' so where does > it fit? > > It has very restricted primary air and charcoal sits on a grate with a pretty > fine aperture. It has no 'shelf' in the Rocket sense. It hoves closer to the > original with the flat metal shelf, nowadays dropped in favour of a 'ladder' > which allows in far more excess air which was already a problem. > > The Rocket Works stove has preheated secondary air with tangential injection > and might still benefit from more control over it - hard to tell at this > stage. The thermal efficiency is pretty high at high power and lower at low > power which is what you would expect from an 'in-the-bottom-out-the-top' > layout. > > [RWL: This is first time I have heard this about charcoal and Rockets. Can > some users describe the maximum amount they have ever retrieved?] > > Any layout where there is no grate to support the charcoal will see the > dropped fuel roasted (pyrolysed) but the char will not burn well (lack of > under-air). The numbers from boiling tests will show the typical char from > say, a kg of wood. > > Because historically the charcoal remaining has been subtracted from the > 'fuel consumed' figure (because it was energy not consumed) you would not see > the actual fuel and actual car number unless you saw the calculation sheet. > That may explain why you didn't hear about it before. > > Putting in a grate (like the StoveTec stoves) raises the char and allows it > to burn. In some cases this may be a disadvantage. It depends on the local > cooking cycles. > > So the question remains, is a Rocket Stove anything from Aprovecho? It is a > particular layout? It is a set of dimensional relationships? Is it a rocket > stove if sticks are fed into the side? In short, is it a brand name or a > type of stove. I remain confused on the answer. Rocket Works doesn't make > Rocket stoves in the classic sense. Does this matter? There are lots of > stoves with side-fed sticks going back millennia. Some have grates, some > don't. > > On the question of additional data that should come from the company. I > don't know the price but do know they said they could make 500 a day if I > recall correctly. It is not very heavy. > > Regards > Crispin > > PS The highest char production of char I have seen from a side-fed stove is > the Namibian Tsotso which has a (slightly) perforated sheet metal grate > instead of a fuel shelf. It made something like 20% char - about the same as > a TLUD. _______________________________________________ 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/
