<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content="text/html; charset=utf-8" http-equiv=Content-Type>
<META name=GENERATOR content="MSHTML 8.00.6001.19412">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT size=4>Remaining mass of water after boiling test.</FONT></DIV>
<DIV><FONT size=4>
<DIV><FONT size=4>How useful is a water boiling test where you boil away
water?</FONT></DIV></FONT></DIV>
<DIV><FONT size=4>It just occurred to me that reducing the volume of water is
not the goal of simmering. Simmering should be just before steam escapes the lid
or open pot. escaping steam is escaping energy. Boiling away water is not
necessary so how should the remaining mass of the water in the pot be counted
after a water boiling test when it is actually a waist of energy because of
lack of turn down heat control.</FONT></DIV>
<DIV><FONT size=4>I know WBT is to test the power of a burner of
stove, but how useful is unnecessary power?</FONT></DIV>
<DIV><FONT size=4>Just a thought, there is probably a simple answer,
Lanny</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=crispinpigott@gmail.com href="mailto:crispinpigott@gmail.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> Sunday, April 28, 2013 5:22
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [Stoves] Truth in stove
reports Re: FW: REQUEST for completesets of raw data of cookstove tests.</DIV>
<DIV><BR></DIV>Dear Ron<BR><BR>The issues with most stove test protocols, but
particularly with the WBT's relate to three type of conceptual errors.
<BR><BR><STRONG><U><FONT color=#ff0000>1. The mass of water remaining in the
pot is used as the amount 'boiled' or 'simmered' and 'specific' performance
numbers are incorrect.</FONT></U></STRONG> <BR><BR>2. The consideration of
dried, torrefied, charred and ashed materials (i.e. non-new materials)
frequently gives misleading performance claims because of the way the energy
content and re-useability of the fuels are considered. <BR><BR>3. The formula
used in many spreadsheets does not handle fuel moisture correctly - simple
math errors that skew different fuel moisture levels differently.
<BR><BR>There are other issues such as the averaging of ratios and averaging
of averages of averages but these are relatively minor in their influence and
error. <BR><BR>By far the largest difference between 'perceived claims' (what
people think they are being told) and the actual meaning of the claimed
numbers relates to treating char made by gasifiers as unburned raw fuel. If
the TLUD promoters do not get to grips with what is happening a) behind the
formulas and b) what is happening behind the scenes with respect to the
difference between a 'uses xx g of fuel to perform a WBT' and the fuel needed
to do so. <BR><BR>The reputation of the stove sector rests on our ability - as
a group - to deal with these in a straight forward manner.
<BR><BR>Regards<BR>Crispin
<DIV>From BB9900</DIV>
<HR>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></BLOCKQUOTE></BODY></HTML>