[Stoves] Good enough stove?

[Paul Anderson]

Stovers,

Crispin raises some important questions.   And I add a couple.

1.  Please help me understand the units (grams or mg)  "per MJ 
delivered".   MJ is megajoule, but is "delivered" referring to the heat 
that enters the pot or the energy that comes from the fuel (and ?? with 
or without allowance for the energy remaining in the char produced?).   
Could this also become a sticky point of debate?

2.  Crispin asks:
> Which would you finance: a reduction in the energy drawn from the 
> forest? Or a reduction in the energy released from the fuel consumed?
There is no single correct response.  Both should be calculated and 
reported.   And the circumstances need to be understood.

The trouble is when only one way is reported, but it is not clear which 
way that is.

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 11/20/2015 5:12 PM, Crispin Pemberton-Pigott wrote:
>
> Dear Friends
>
> Retesting a stove is always a good idea to see if there was a) any 
> equipment problem and b) to confirm unusual findings.
>
> Another good one:
>
> PM2.5 3.5 mg/MJ delivered
>
> CO 3.8 g/MJ delivered
>
> Energy efficiency 33.4% (based on raw fuel consumed per replication, 
> reusable fuel carried forward to the next replication)
>
> WBT efficiency 49.5% (based on energy from the fuel burned, crediting 
> char)
>
> This highlights the difference between reporting the energy efficiency 
> and the thermal efficiency, respectively. If a tier of performance is 
> rating the thermal efficiency (heat transfer efficiency x combustion 
> efficiency) instead of the energy efficiency, there is a factor or 1.5 
> difference between the numbers. Which would you finance: a reduction 
> in the energy drawn from the forest? Or a reduction in the energy 
> released from the fuel consumed?
>
> This is a subject worthy of discussion. The timing is also good as the 
> ISO is working on this right now.
>
> Regards
>
> Crispin
>
>
>
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