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Crispin,<br>
<br>
Thanks for that great report. Congratualtions!!!! Great to read
of progress!!<br>
<br>
Please tell us about the cost of the stove models. And can the
people afford them? And prospects for have sufficient production
in the near future.<br>
<br>
Paul<br>
<pre class="moz-signature" cols="72">Doc / Dr TLUD / Prof. Paul S. Anderson, PhD
Email: <a class="moz-txt-link-abbreviated" href="mailto:psanders@ilstu.edu">psanders@ilstu.edu</a>
Skype: paultlud Phone: +1-309-452-7072
Website: <a class="moz-txt-link-abbreviated" href="http://www.drtlud.com">www.drtlud.com</a></pre>
<div class="moz-cite-prefix">On 3/4/2017 1:15 AM, Crispin
Pemberton-Pigott wrote:<br>
</div>
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<p class="MsoPlainText">Dear Friends<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">An update is in order from the field in
Kyrgyzstan to let you know how the new stoves are being
accepted.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">A quick review:<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">We are testing heating stoves with
cooking functions (mostly). Some people cook with electricity
or gas, everyone heats water on whatever stove surface is
available.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">We installed 4 models of stoves in a
total of 51 homes. In the areas primarily burning dung we
installed Models 1 and 2 which are brick-lined box stoves. The
Model 1 is a chimney heater, meaning it generates heat that it
puts into the chimney which serves as the heat exchanger, or
into a brick wall as a 'heating wall' which are very common.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Model 2 is the same, one brick longer
and has a heat exchanger, operating like a conventional space
heating stove in North America. The fuels are dung, wood,
cotton stalks, and combinations, often dung co-fired with
wood. In some cases, particularly when it is extremely cold,
they co-fire coal with wood or use coal alone.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The Model 4 has been previously
described. It is a cross-draft coal gasifier with extremely
low emissions of PM and CO. It uses coal between 16 and 25mm.
This was installed in regions where coal is predominantly
used, or in the case of Naryn, where all fuels are used.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The Model 5 is a low pressure boiler. It
was installed in homes where there is a central water heating
system with water circulation powered by a pump or naturally
by a thermosiphon.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In those homes in the high mountain
region of Naryn, the Model 1 and half the Model 2 were
rejected for lack of heat. The home temperature was lower than
with the traditional stove. The fuel consumption and
emissions, cooking performance etc was not of interest because
the homes were too large and outside it was too cold to heat
the home adequately. Half the Model 2 owners kept on. One man
was happy with it from the beginning because his place was
smaller and it was working fine for him. There is appreciation
for the fact that the stove will burn well with only dung
instead of having to co-fire it with wood which is more
expensive.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The Model 4 recipients were universal in
their praise of the stove. It is faster cooking, has
controllable heat, uses far less fuel, and uses a cheaper size
of fuel than the regular stoves. Coal of 80mm is more
expensive as everyone wants it. The 16-25 size is 1/3 cheaper.
Because the stove needs so much less of it, the overall saving
is large.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The major compliments were:<o:p></o:p></p>
<p class="MsoPlainText">It always has hot water as the stove is
never going out.<o:p></o:p></p>
<p class="MsoPlainText">It heats for 10 or more hours without
attention.<o:p></o:p></p>
<p class="MsoPlainText">There is no longer any smoke in the
house.<o:p></o:p></p>
<p class="MsoPlainText">There is no smoke from the chimney.<o:p></o:p></p>
<p class="MsoPlainText">It uses 1/10th of the wood needed to
light the traditional stove.<o:p></o:p></p>
<p class="MsoPlainText">It lights quickly (ignition to cooking
time).<o:p></o:p></p>
<p class="MsoPlainText">It heats two rooms whereas before the
stove only heated one.<o:p></o:p></p>
<p class="MsoPlainText">The temperature in the house is higher
than it was before, even though two rooms are being heated.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The Model 5 recipients were of two kinds
- those whose house was too big and those whose house was not.
Correctly selected, there is adequate heating using normal
operation. In homes where it is undersized, people found that
it can be 'pushed' by opening the ash drawer a little which
drives the fire much faster. Earlier testing shoed the
increase in water heating power was 50% but we advised against
using it in that manner. It is clear that we need a larger
version because except for heating power, it was also highly
appreciated.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The compliments were about the same as
for the Model 4:<o:p></o:p></p>
<p class="MsoPlainText">There is no longer any smoke in the
home. <o:p></o:p></p>
<p class="MsoPlainText">It uses much less fuel.<o:p></o:p></p>
<p class="MsoPlainText">It runs for a very long time.<o:p></o:p></p>
<p class="MsoPlainText">We wish we could also cook on it (or
heat water).<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">We now have the option of putting a heat
exchanger into the Model 4 or a cooking function onto the
Model 5.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The stories coming back from the field
about the Model 4 are going to be legendary. In one village of
150 homes, the project vehicle was stopped 30 times by people
demanding to know where they could get such a stove. One woman
wanted 6. Another wanted 11 for her entire extended family.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In a village where there were both Model
2's and 4's, all the Model 2 owners (burning biomass) wanted
to switch to the coal-burning Model 4's even though they would
have to buy fuel. It simply transformed the way the family
lived: warmer, cleaner and far more convenient.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In a village with 400 homes, 4 of which
had Model 4's, the chief told me he needed 130 immediately for
all social passport families. They were saving so much expense
it has the effect of more than doubling the government grant.
The homes were obviously warmer in spite of the reduction in
fuel consumption.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Calculating three different ways, we
arrived at the conclusion that the stoves produce 40% more
heat using 40% less coal. While they could have saved 66% they
chose to be warmer.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Asking how many times they light the
stove, some replied, "Never." Since it was installed it has
never gone out. They simply refill the hopper every 10-12
hours. Because the stove requires that the fuel be made
smaller than 30mm people were asked about it. Was it
drudgery? They replied that to make two buckets a day of coal
to size was far preferred over burning 5 buckets a day.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">In several homes we found that the
heating stove was not capable of cooking. It would heat but
not boil water. People resort to using an electric kettle for
hot water and some cook on an electric hot plate placed on top
of the stove, even when it is running!<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">All that has ended. Because the stove
runs all the time at a constant, regulated heating power,
kettles and buckets of water placed on the stove are always
hot. This is considered a major social upgrade.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Something that surprised us was the
number of times that a cat appeared in the photos, usually
under a stove. The leg length is important for cooking height
and fitting into the space under the heating wall (many are
bridge-like mounted over the stove). So leg length is also
important for making sure the cat can get into its favourite
place.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">As a result of the rejection of the
Model 2's in the really cold regions (-35 C at night) we
decided to create a much larger dung burner. This is dubbed
the Model 2.5 and is available for download on my website in
the Library under Stoves/Kyrgyzstan/Model KG2.5. This is about
80% larger and has two new features. It has an upwards sloping
flame tube at a raise end on the heat exchanger both to create
enough heat exchanger surface and to accommodate the flame
tube. The tube points into the far left corner which is
protected by three sacrificial metal plates welded inside the
body. They will evaporate first so the body will last longer.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">The layout is the same as for the Model
2 except it is wider. The heat exchanger is longer and taller.
The efficiency is about 85% and it will work very well using
dung along. The emissions are low.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">As a coal burner, it gets the same
treatment as the Model 2: the grate has two positions so the
grate tilts towards the fire. The fire is always ignited and
operated under the cooking station, not by the door. As the
coal burns it falls from the door-side down towards the fire,
working mostly as a crossdraft gasifier. The result is a very
long burn (9 hours) using 10 kg. Burning dung, it can hold 5
kg of low density fuel and burns for about 3.5 hours with half
an hour in reserve to burn the remaining char. With both
fuels, this is far longer a burn time than the traditional
stove.
<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Cooking power is greatly enhanced but we
don't know by home much. Boiling water takes 3 minutes per
litre which is apparently very quick, according to them. Good.
The raised heat exchanger can accommodate a 20 litre bucket of
water for heating. The cooking hole can accommodate a 30 litre
wok.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Fortunately for us, the organisation
Fresh Air in the Netherlands is monitoring the IAQ before and
after the stoves are changed, including monitoring similar
homes nearby. The smoke encountered indoors is appalling,
running up to 6000 µg/m<sup>3</sup>. That is measured personal
exposure, not measured in the home. We will get the results of
after intervention in a few days. Apparently it looks good.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">A similar pilot is taking place in
Tajikistan as well but without the IAQ monitoring. They are
using Models 1-4 including the Model 3 which is a TLUD for
heating social buildings (schools etc) during the day only.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">All the stoves are free-to-air with the
latest drawings appearing either in the Kyrgyzstan or
Tajikistan folders. There is an elliptical hole calculator in
the Model 2.5 folder for workout out the angle of the cut on
the flame tube where it intersects the central divider. This
will help constructors who wish to change the offset up or to
the side.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">Regards<o:p></o:p></p>
<p class="MsoPlainText">Crispin<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
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