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<span lang="EN-US">Ciarán,<br>
Option 1) is incorrect. Type15 is intended to be used with
year-long weather files that have a 1-hour data interval. The
component knows from the simulation start and stop time what day
of the year it is, so if you trick it by setting the simulation
start time to hour zero and rearrange the weather file to start in
the middle of the year, what the Type calculates about the sunup
and sundown times and what the data file says is happening are not
going to match at all. Option 2 is the only correct one.<br>
Best,<br>
David<br>
<br>
<br>
</span>
<div class="moz-cite-prefix">On 11/12/2012 06:32, Flynn Ciaran
wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Hello,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have a couple of
questions concerning the relationship between the
arrangement of data in TMY2 weather files, TRNSYS simulation
times and convergence errors. I tried looking at the source
code but I could not figure out the answer..<br>
I am running a simulation for one year, using Type 15-2 for
weather, starting at 1h on July 1<sup>st</sup> and ending at
24h on June 30<sup>th</sup>. This leaves me with two
options:
<br>
1) Either I rearrange the tm2 file to start at 1h on the 1<sup>st</sup>
of July and end at 24h on June 30<sup>th</sup>, and set the
simulation start and stop times to 0 and 8760h respectively,
or
<br>
2) Either I leave the weather file as it is and set the
simulation start and stop times at 4344h and 13104h
respectively.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">When I use a provided
weather file (e.g. CA-BC-Vancouver-718920.tm2) and set the
simulation time step at 0.1h, I get the following:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<table class="MsoTableGrid"
style="border-collapse:collapse;border:none" border="1"
cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td style="width:42.15pt;border:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" valign="top"
width="56">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US"><o:p> </o:p></span></p>
</td>
<td style="width:106.3pt;border:solid windowtext
1.0pt;border-left:none;padding:0cm 5.4pt 0cm 5.4pt"
width="142">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">Failed convergence
time steps<o:p></o:p></span></p>
</td>
<td style="width:184.3pt;border:solid windowtext
1.0pt;border-left:none;padding:0cm 5.4pt 0cm 5.4pt"
width="246">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">Time steps where:
<br>
calculated total horizontal radiation >
horizontal extraterrestrial radiation<o:p></o:p></span></p>
</td>
<td style="width:120.45pt;border:solid windowtext
1.0pt;border-left:none;padding:0cm 5.4pt 0cm 5.4pt"
width="161">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">Time steps where:
<br>
direct normal radiation > solar constant<o:p></o:p></span></p>
</td>
<td style="width:177.2pt;border:solid windowtext
1.0pt;border-left:none;padding:0cm 5.4pt 0cm 5.4pt"
width="236">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">Time steps where:
<br>
calculated horizontal beam radiation > total
horizontal radiation<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td style="width:42.15pt;border:solid windowtext
1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt"
valign="top" width="56">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">1)<o:p></o:p></span></p>
</td>
<td
style="width:106.3pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="142">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">7719<o:p></o:p></span></p>
</td>
<td
style="width:184.3pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="246">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">10664<o:p></o:p></span></p>
</td>
<td
style="width:120.45pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="161">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">124<o:p></o:p></span></p>
</td>
<td
style="width:177.2pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="236">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">3498<o:p></o:p></span></p>
</td>
</tr>
<tr>
<td style="width:42.15pt;border:solid windowtext
1.0pt;border-top:none;padding:0cm 5.4pt 0cm 5.4pt"
valign="top" width="56">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">2)<o:p></o:p></span></p>
</td>
<td
style="width:106.3pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="142">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">6424<o:p></o:p></span></p>
</td>
<td
style="width:184.3pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="246">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">-<o:p></o:p></span></p>
</td>
<td
style="width:120.45pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="161">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">-<o:p></o:p></span></p>
</td>
<td
style="width:177.2pt;border-top:none;border-left:none;border-bottom:solid
windowtext 1.0pt;border-right:solid windowtext
1.0pt;padding:0cm 5.4pt 0cm 5.4pt" width="236">
<p class="MsoNormal" style="text-align:center"
align="center"><span lang="EN-US">13<o:p></o:p></span></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">So my question are:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">Why
is TRNSYS giving different error messages if the same
weather data are used ? (I believe that there are no other
types in my file that could explain the reason for this)<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">What
parameters do the radiation values calculated by TRNSYS
depend on and how are they calculated?
<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">-<span
style="font:7.0pt "Times New Roman"">
</span></span></span><!--[endif]--><span lang="EN-US">What
is the best approach in this situation (minimal radiation
errors)?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks a lot,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Ciarán<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span lang="EN-US"><o:p> </o:p></span></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
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<br>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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