Re: Hello from Nairobi

[AJH <andrew.heggie@dtn.ntl.com>]

On Thu, 23 May 2002 10:18:03 +0300, "elk" <elk@wananchi.com> wrote:

>But it still doesn't explain this deathly silence.......

I thought you were the busy one....

>>    All's well in Nairobi. Busy trying to meet the increased demand for our Vendor's Waste Charcoal in response to the rainy season and the Kenya Gov't ban on timber and charcoal harvesting in forests.


It's an ill wind that blows nobody any good.
Anyway it's nice to see that your vendors waste briquettes are in
demand, I have tried some briquettes recently and find their slower
burning is good for spit roasting. I wonder if this is compensation
for all the clay that you have to buy with the charcoal.

Ronal is busy on projects local to him and has recently upgraded his
software which may explain his silence.

If Peter V has sourced the information that he thought would put his
downdraught barbecue up in the top right of the chart Kirk posted
perhaps we could discuss the attributes which the chart addresses.

I was very late in managing to see the chart because I could not
decode the powerpoint presentation so I have not commented on Kirk's
post till now. I can readily see it as a gif on the crest site.

The chart attempts to combine elements of combustion efficiency and
heat transfer.

Prasad hinted at the fact that combustion efficiency must not be seen
only as completeness of combustion because this can be achieved at the
expense of copious amounts of excess air. This raises the mass flow
and dilutes the temperature. This lower temperature has implications
for poor heat transfer. IMO the higher grade the fuel the lower excess
air required to reach an equilibrium which produces an acceptable
level of pollutants.

If we can build on the chart (which might be viewed as ascii art) we
should look at what factors will enable biomass stoves to get up in
the right hand top by considering what causes the stoves on the
original chart to score as they do.

I still fail to see how biogas (which I take to be a mixture of CO2
and methane) can better lpg (propane) in the chart, whereas I can see
that "natural" gas as delivered via the gas grid (nearly pure methane)
would be the best performer.

AJH with steam powered cookstove!


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