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<DIV><FONT size=4>If the reaction takes place in a gaseous state, why does the
laden heat of evaporation apply?</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">crispinpigott@gmail.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Sunday, October 06, 2013 8:29
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Stoves] Gross verses net
calorific value for dry wood</DIV>
<DIV><BR></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Dear Lanny </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">It is a lot more arbitrary that you might think. That
is why there are different values used in different
industries. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Some fuels contain hydrogen. Some don't. Hydrogen
burns to water. Water has a phase change at 100C. Because the main application
of heat in cooking is to bring things to the boiling point it is obvious that
condensed water vapour just below the boiling point adds nothing to a boiling
pot. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">So the energy released by condensing water vapour to
liquid is not useful for cooking unless the pot is cold, and even then it
would have to be evaporated again later unless it dripped
off. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)">When
testing the whole fuel in a Bomb Calorimeter the latent heat of condensation
is counted. So while the heat is there it is not useful for cooking,
mostly. </DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">So the Latent Heat is discounted when making
efficiency calculations. Work done divided by heat available =
efficiency. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">The value given to heat available is the HHV (total
energy) minus the latent heat of condensation of the water vapour created by
burning the hydrogen in the fuel. Obviously this varies with fuel
type. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">In biomass the H2 content doesn't vary much. The H2
mass burned to H2O gives a new mass. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">That mass (of water vapour) x 2257 J/g = 1,320,000
Joules for normal biomass. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">It is never exactly that but it is close enough for
government work. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">HHV - 1.32 = LHV in MJ</SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Approximately. </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Regards </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Crispin boarding in Yogyakarta' little
airport </SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large"><BR></SPAN></DIV>
<DIV
style="BACKGROUND-COLOR: rgb(255,255,255); WIDTH: 100%; FONT-FAMILY: Calibri, 'Slate Pro', sans-serif; COLOR: rgb(31,73,125)"><SPAN
style="FONT-SIZE: large">Can you explain that in a way...</SPAN></DIV>
<DIV style="BACKGROUND-COLOR: white" id=_originalContent>
<DIV><FONT size=4>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"><SPAN
style="COLOR: rgb(31,73,125)"><O:P></O:P></SPAN><SPAN><SPAN></SPAN><BR></SPAN></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN
style="FONT-FAMILY: Wingdings; COLOR: #1f497d">J</SPAN><SPAN
style="COLOR: #1f497d"><O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN
style="COLOR: #1f497d">Crispin<O:P></O:P></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><O:P></O:P></SPAN></P>
<P class=MsoNormal><O:P></O:P></P>
<DIV>
<P style="MARGIN: 0mm 0mm 0pt" class=MsoNoSpacing><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt">What is the
difference between<O:P></O:P></SPAN></P>
<P style="MARGIN: 0mm 0mm 0pt" class=MsoNoSpacing><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt">Gross calorific
value (dry fuel)</SPAN><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt"><O:P></O:P></SPAN></P>
<P style="MARGIN: 0mm 0mm 0pt" class=MsoNoSpacing><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt">and<O:P></O:P></SPAN></P>
<P style="MARGIN: 0mm 0mm 0pt" class=MsoNoSpacing><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt">Net calorific
value (dry fuel)<O:P></O:P></SPAN></P>
<P style="MARGIN: 0mm 0mm 0pt" class=MsoNoSpacing><SPAN
style="FONT-FAMILY: 'Calibri','sans-serif'; FONT-SIZE: 14pt">Used in the WBT
spreadsheet</SPAN></P></DIV></DIV></BLOCKQUOTE><BR><!--end of _originalContent --></DIV>
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