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<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Dear Mr. Peeters</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Just recently we developed such a model for TRNSYS16, we
finished programming on it last week and it is under test now. The advantages of
the models are:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>-freedom to choose any fuel by means of mass weight of the
elements and the lower heating value</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>-predefined fuels with standard mass weights and lower
heating values for oil, natural gas and biomass</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>-possibility to simulate condensing
technology</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>-consideration of heat losses to ambient (thermal mass of
the boiler and delta-T to ambient)</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Although the model can do all this, it is still quite
simple and has therefore also some limits (one-node approach for the thermal
mass of the boiler). At the moment, we are fitting measured data with the model
and the results look quite good. We have not done all-year-simulations in a
TRNSYS-environment yet. The model is not able to heat the boiler mass without
mass flow of water (may be we'll include this later).</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>We can send you the model if you will communicate your
experience with the model - especially if you run into troubles or don't find
information you need in the description of the inputs and
outputs.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Please tell us if you found any other TRNSYS-types that can
do these things...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Sincerely</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2>Michel Haller</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT> </DIV>
<DIV dir=ltr align=left>
<HR>
<FONT face=arial size=-1><B>Michel Haller</B><BR>Systemtechnik / System
Division<BR>Institut für Solartechnik SPF: <A
href="http://www.solarenergy.ch/spf.php?lang=de&fam=44&tab=3">Adresse</A>
/ <A
href="http://www.solarenergy.ch/spf.php?lang=de&fam=41&tab=1">Website</A><BR>Hochschule
für Technik Rapperswil HSR<BR>Tel. +41 55 222 48 29<BR>Fax +41 55 222 48
44</FONT>
<HR>
</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=228563706-21122005><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV><BR>
<DIV class=OutlookMessageHeader lang=de dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>Von:</B> Leen Peeters
[mailto:leen.peeters@mech.kuleuven.ac.be] <BR><B>Gesendet:</B> Donnerstag, 1.
Dezember 2005 15:01<BR><B>An:</B> trnsys-users@engr.wisc.edu<BR><B>Betreff:</B>
[TRNSYS-users] condensing boiler model<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><FONT face=Arial size=2>Dear all,</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>does someone have a 'simple' model of a condensing boiler
that he/she could share? We're looking for a 'gray box' model. We want as inputs
the inlet temperature, the desired outlet temperature and as output at least the
effective outlet temperature and the gas consumption.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>thanks,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Leen Peeters<BR>Applied Mechanics and
Energy<BR>University of Leuven<BR>Celestijnenlaan 300A<BR>3001
Heverlee<BR>Belgium<BR>Phone +32-16-322.518</FONT></DIV><BR><BR><FONT face=Arial
size=2>Disclaimer: <A
href='ttp://www.kuleuven.be/cwis/email_disclaimer.htm"'>http://www.kuleuven.be/cwis/email_disclaimer.htm</A>
for more information.</FONT> <BR><BR></BODY></HTML>