[Stoves] More about charcoal (no longer about Re: LPG import in India)

[Paul Anderson]

Crispin, Frank and others,

I am curious:    Energy of charcoal is stated as

29.5 MJ/kg.

I have seen that number before.   Certainly well established.

My question is about how the energy content per unit of weight changes 
when charcoal is with different amounts of volatiles, which greatly 
impacts the YIELD by weight, but maybe not the energy per weight unit.   
Relates to:  Charcoals created at higher temperatures have less 
volatiles, but are more pure in the carbon content. So, when one kg of 
char is burned, is the energy released about the same for the full range 
of charcoal types, such as low-temperature (400 C ?) charcoal, TLUD 
(~550 to 650 C), and high temperture (~900+ C?) charcaol such as 
activated charcoal?

Paul

Doc  /  Dr TLUD  /  Prof. Paul S. Anderson, PhD
Email:  psanders at ilstu.edu
Skype:   paultlud    Phone: +1-309-452-7072
Website:  www.drtlud.com

On 12/28/2017 5:41 PM, Crispin Pemberton-Pigott wrote:
> The odd thing about the 'Nigerian' source is that the EU requires that not only does it have to be from a sustainable source, it has to be produced using a method that yields 35% of the dry mass input.
>
> As the stoves that I have heard about don't come close to that, it would perhaps be wise to start creating an argument holding that if a certain percentage of the initial energy was used for some useful (fuel displacing) task during the creating of the ‎charcoal, it counts towards the 35% mass yield. I suggest arguing for delivered energy for the task, worked backwards to a % of mass yield based on the efficiency and 29.5 MJ/kg.
>
> In that way the efficiency of the application is encouraged to be high, and the system efficiency, even though displaced by thousands of miles, is assessed fairly.
>
> Thoughts?
> Crispin
>
>
>
>

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