[Stoves] Understanding what TLUD means.... was Re: stoves and credits again

[Nikhil Desai]

Crispin:

You would never stop praying to the goddess of efficiency as if she has
only one form.

We in India recognize our goddesses, cooks and meals in multiple forms.

Therefore, while "mixing char in with dry biomass for cooking" may improve
"efficiency", the context in which this occurs may also be important.

I mentioned earlier that I remember making char to we can store it when
wood was not delivered in a timely manner or could not be delivered in the
quality desired (such as during the rainy season). So, mixing dry stored
wood with dry charcoal (home made) improved efficiency in some technical
sense but most importantly it was the best use of resources.

Please leave "subsidy" jazz out of technical discussion. There are ten ways
to skin a sacred cow of subsidies.

Same about the "income effect" or "clawing back" efficiency gains. Nobody
should give a hoot. I know it's a favorite pastime of certain engineers and
economists to argue about "efficiency" - whether it's a goddess or a
strumpet. Makes no difference other than publishing useless papers.



Nikhil

------------------------------------------------------------------------
Nikhil Desai
(US +1) 202 568 5831
*Skype: nikhildesai888*


On Sat, Sep 30, 2017 at 3:00 PM, Crispin Pemberton-Pigott <
crispinpigott at outlook.com> wrote:

> Dear Gordon
>
>
>
> >A basic question: What is the intended purpose in mixing char in with dry
> biomass for cooking?
>
>
>
> Gordon
>
>
>
> It improves the fuel efficiency. Not all stoves can do this, and there is
> a question on the application specifically looking at this question. Can
> the partially burned remnant fuel be included in the next replication?
>
>
>
> If so, the first test run is used to generate the char for the first
> official test. In such cases there are 4 tests instead of three. I can tell
> the how the question was answered by looking at the number of tests in the
> set. If there are 4, the fuel forwarding was included in the replications.
> If only three, which is a common case with TLUD’s, then there is no remnant
> fuel recovered and saved for the next run.
>
>
>
> Because stoves that consume less fuel get a higher subsidy (paid to the
> marketer for getting the stoves sold) it is important to correctly operate
> the stove on the limits of its capabilities – that is, according to the
> most beneficial operating method available.  If the users do not achieve
> the fuel economy potential, there is a failure to communicate or train
> users. This is detected in the follow-up field investigations. Generally
> speaking, comparing ideal contextual lab tests and in-field performance,
> users get at least 80% of the potential savings that we identified.
>
>
>
> Before saying that there is a gap, one must ascertain whether or not the
> shortfall in savings is in fact due to increased cooking time made possible
> by the fuel efficiency. This is a very common outcome of field
> investigations. For example in Kyrgyzstan the fuel saving is about 60-66%
> in terms of the stove, but 20-25% is ‘spent’ keeping the house warmer or
> cooking longer. Similarly we found in Maputo that when people had a really
> improved stove, they cooked much longer at low power to keep food warm,
> using (spending) about half the fuel saved. This behaviour does not impact
> the performance rating of the stove alone on the contextual test result.
>
>
>
> Regards
>
> Crispin
>
>
>
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