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<DIV>All,</DIV>
<DIV> </DIV>
<DIV><FONT size=2 face=Arial>Our test stove has a power level of 1.6 to 6
kw. What ever cooking arrangment is placed on top of that will have its
own characteristics. The power level experienced by the cook will depend
on these characteristics, and no doubt each arrangment will be different from
the test stove. Each of these arrangments is valid for the cooking
techniques to be used. </FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>If anyone is interested in a very low
emissions, clean TLUD-ND with turn-down, then take a look at our test
stove. The principles may work for you. Test results have
been presented on the list twice.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>The stove will be at Aprovecho during stove camp in
August for all to examine. We will be there to answer questions
about how it works and to give demonstrations showing both low emissions
and turn-down. Come and see for yourself. The updated Aprovecho
booklet will be available soon.</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Kirk H.</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"
dir=ltr>
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=crispinpigott@outlook.com
href="mailto:crispinpigott@outlook.com">Crispin Pemberton-Pigott</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">Stoves</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 07, 2016 7:26
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] kgharris stove
test</DIV>
<DIV><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)">Dear
Kirk</DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Thanks
for those perspectives. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>From
your last message:</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>>The
power level is 1.6 kw to 6kw with c</SPAN><SPAN>ushion on each
end. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Do
you know how these figures were obtained? </SPAN><SPAN>You mentioned
that the mass change was noted every 5 minutes. It that the root of the
number?</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>You
also mentioned that the high power during the test was about 3.75 kW (?) if I
recall near enough. </SPAN><SPAN>Was this established in the same manner
as the 6 kW or was it taken from the WBT spreadsheet?</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>I
would like to understand how they were determined so as to compare them with
future reports. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>From
the low power test result there should also have been a power (average power)
from the spreadsheet. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>></SPAN><SPAN>What
ever cooking arrangment design you use is up to </SPAN><SPAN>you and heat flux
will change accordingly. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Thanks
for the message on the side that the pot was 24.4 cm in diameter. As you have
a skirt on the pot the 'heated surface area' is larger than the bottom's 467.6
cm^2. How high is the skirt, or more exactly, how high is the portion of the
pot that is enclosed by the skirt when it is sitting on the stove (the skirt
might descend below the bottom of the pot).</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>For
the calculation of the high power heat flux we will need to know the rate of
heat gain, either the peak or the average. If you don't have any intermediate
temperature readings that's not a problem. We can use the total heat gained by
the pot during the hot start and the duration in seconds to get an average
heat gain rate. That, divided by the heated area, gives the heat gained per sq
cm. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>If
you remove the skirt, that value will change. Your comment about people not
using the skirt is relevant. If we are sure some people will not use
it, then knowing the performance in both conditions would be
helpful. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>In
the Indonesian CSI pilot there was a stove submitted with a skirt. It tested
well and was moved to the focus group testing. The skirt was so inconvenient
to use that it was rejected so the stove had to be re-evaluated without it to
get a new rating as the subsidy level offered to the vendors is based on its
performance. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>The
drop in performance without the skirt was statistically significant so the
subsidy level changed. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>If
you have the WBT test spreadsheet the heat flux values can be calculated for
both high and low power. They are based only on the pot size and the energy
gained and have nothing to do with the fire. That is an important point. The
number represents the cooking power experienced by the cook. It can be
obtained easily in the field with little equipment. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>>If
the people in Java can use a </SPAN><SPAN>stove with 1.6 to 6 kw, and can
use that heat effectively, then the power </SPAN><SPAN>level is adequate
for Java or anywhere else. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Well
therein lies the problem. The firepower is not the cooking power and without
the cooking power number, we don't know in advance if they will accept it or
not. If we factor out the pot size (really, the heated area) we get a cooking
power per sq cm [Watts]. That can be applied across all pots, or certainly all
similar pots so we can estimate acceptance based on social science surveys
indicating acceptable performance. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Because
the acceptable high and low power heat flux is culturally determined,
and varies from place to place, the metric has a special relevance for
programme implementation agents. We would like to know in advance what people
expect and what a candidate stove can offer. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>To
sum up I repeat the three most important questions:</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>How
was the 6 kW determined?</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>What
is the heated area of the pot?</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>What
was the average cooking power?</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>The
last number is available from the numerator of the efficiency calculation cell
for any test phase - just delete the denominator portion of the formula and
instead divide by elapsed time in seconds. The answer is in
Watts. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Usually
the Hot Start phase will yield the highest value. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Thanks</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN>Crispin </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif, sans-serif; COLOR: rgb(31,73,125)"><SPAN></SPAN><SPAN><BR></SPAN></DIV>
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