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<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Dear</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Trnsys
Users,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'>I’m doing some
experimental validation of the Type 45 code with a solar collector manufactured
in </span></font><st1:country-region><st1:place><font size=2 face=Arial><span
lang=EN-US style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-US'>Brazil</span></font></st1:place></st1:country-region><font
size=2 face=Arial><span lang=EN-US style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-US'>. The year 2004 is a leap year, with 366 days. The
TRNSYS solar radiation processor calculates the solar declination angle based on
a year with 365 days. My question is, should I use the simulation start and
stop time according to a “normal year” or a “leap
year”? For example, June 29<sup>th</sup> is the day number 180 of a
normal year and the day 181 of a leap year. What I want to assure is that the
declination angle calculated by Trnsys corresponds to the position of the sun
during the experiment. The solar declination angle is calculated, I guess, once
per day. If that is true, a difference from one day to the next would be in the
order of 0.01 degrees. It probably won’t make a difference at all. Please
tell me if otherwise!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-US style='font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'>Juan<o:p></o:p></span></font></p>
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