[Stoves] FW: Need designs

Kevin C kchisholm at ca.inter.net
Fri Sep 14 01:49:29 PDT 2012

Dear Aron

With natural convection, one would expect greater heat transfer  
through a vertical plate than a horizontal plate.

1: As a first approximation, what about simply taking an arithmetic   
percentage of each coefficient? For example, if the U factor for a  
vertical plate, Uv was 10, and for a horizontal plate Uh 7, and the  
cone angle was X, could you calculate the U Factor for the cone, Uc,  
as follows:

Uc = X/90*Uv + (1-X/90)*Uh

2: If you can't find a method that gives acceptable results, then what  
about taking a cylindrical heating element, with constant power input,  
and measure its surface temperature when it is tilted at various  
angles from the vertical?

I would guess that the second method would give better results than  
the first. At the very least, it should give you a "real world  
approximation" of the importance, or lack of importance, of cone angle.

Please let us know what you eventually find.

best wishes,

Kevin Chisholm

Quoting <>:

> Can you help me on how to analyse heat tranfer through a cone... Im
> designing a Biochar stove with coencentric cylinders. In essence its a
> rocket stove. I want to make the inner cylinder conic so that i can retain
> more heat in the stove....
> The books i have read dont show me how to analyse conduction and convection
> in a cone...
> Will need a reply as soon as possible, if your able to help.
> Thank you in advance...
> On 8/10/12, Erin Rasmussen <erin at trmiles.com> wrote:
>> Hi Aron,
>> We have the TLUD Handbook is on our web site here:
>> http://stoves.bioenergylists.org/tludhandbookdraft-1
>>  a shorter link directly to the handbook pdf file is
>> http://bit.ly/NhrZWX
>> Plans for the Anila stove are here:
>> http://stoves.bioenergylists.org/anila
>> I hope that helps, let me know if I can be of any assitance.
>> Kind regards,
>> Erin Rasmussen
>> TR Miles Technical Consultants Inc.   http://www.trmiles.com/
>> and BioEnergy Discussion Lists   http://www.bioenergylists.org/
>> erin at trmiles.com
>> -----Original Message-----
>> From: Aron Tjihumino [mailto:atjihumino at gmail.com]
>> Sent: Wednesday, August 01, 2012 9:59 AM
>> To: Erin at trmiles.com
>> Subject: Need designs
>> Afternoon...
>> I'm Aron Tjihumino, a final year Bachelor of Engineering: Mechanical
>> Engineering Student at the Polytechnic of Namibia, Namibia
>> I am desgining a biochar and i need plans from where to start.
>> Can you please email me plans for Anila And Anderson TLUD biochar
>> stove, please Look forward to hearing from you soon.
>> kind regards
>> Aron Tjihumino
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