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Charles,<br>
Both are based on the equations that are laid out in Duffie and
Beckman's <u>Solar Engineering of Thermal Processes</u>. Type15
performs the computation in a subroutine called GetIncidentRadiation
(look at lines 3517 to 3539 of Type15.f90.) Type109 calculates it in a
subroutine called suncalc (lines 2435 to 2437 of Type109.f90). When we
were developing Trnsys17, we did note a number of discrepancies about
the way that Type109 was operating at timesteps other than 1 hour. You
might run your comparison at a 1 hour time step and see if the problem
goes away.<br>
Best,<br>
David<br>
<br>
<br>
<br>
On 7/15/2010 02:11, LAUNAY Charles 226591 wrote:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB">Dear all,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB">I would like to know how types
15 and 109 compute the solar zenith
angle. I can’t find this information in the manual. <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB">I’m using TRNSYS 16.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB">Thanks for your help.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 11pt;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="3"><span
style="font-size: 12pt; color: navy;" lang="EN-GB">Charles LAUNAY</span></font><span
lang="EN-GB"><o:p></o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
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F:+1.608.278.1475
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