[Stoves] FW: REQUEST for complete sets of raw data of cookstove tests.

[Crispin Pemberton-Pigott]

Dear Kevin

 

You analysis is correct. When rating the performance of a stove from a fuel
use perspective, the chart is correct:

 

Two stoves are being compared for "Efficiency". 

Given facts from Tests:


 

STOVE A

STOVE B

STOVE C

STOVE D


Nature of Fuel

Ag. Waste

Ag.Waste

Stickwood

Stickwood


Fuel Energy Supplied, MJ

10

15

10

15


Energy to Cooking Pot, MJ

5

5

5

5


Energy in Char, MJ

0

5

0

5


Stove Efficiency, %

50.00%

33.33%

50.00%

33.33%

 

If someone is interested in the char, it can be reported. What Ron is
proposing, to add that heat energy available in the char back into the mix,
is akin to considering the energy efficiency to be the fuel efficiency which
is precisely what created for us a problem in the first place. 

 

The energy value of the char came from somewhere. Consider a stove that
takes 2 tons of forest per year. If it produces ¼ of a ton of forest’s worth
of energy in the form of char, fine. Say so. But saying so does not reduce
the two tons of forest it takes. If you have (as you pointed out) a second
stove that can utilise the charcoal, then that can be viewed as a ‘system’
by all and sundry, but is still does not change the fact that Stove 1 takes
two tons of forest each year which is what the reported fuel consumption
should be. No smoke and mirrors.

 

Burying the char as a soil amendment instead of burning it merely takes us
back to the two tons of forest per year draw-down and returns it to the
environment in an (apparently) inert, solid form.

 

What has been happening that is wrong, in my view, is that stoves that take
off 3 tons of forest per year have been getting credit for taking only one
ton and proclaimed to be ‘better’ and ‘more fuel efficient’ than a two-ton
stove. Plainly this is not the case and the test method has to report the
fuel consumption correctly. It is a problem that the UNFCCC methodology does
not handle this well because it is being used for CDM trades.

 

Regards

Crispin

 

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