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</o:shapelayout></xml><![endif]--></head><body lang=PL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Anyone who is following this subject, quick sum-up.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>According to Sunliang’s answer I’ve verified model using different ground reflectance from 0,1 to 0,9. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This gave (in best case scenario) reduction of solar radiation by 1kWh/month.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Other things that Sunliang has suggested is to check pyranometer condition during winter time:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>whether it was covered by ice, dust and so on,<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-US style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>check the occurrence of any heating element that removes snow.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Other possibility is to check other numerical models for solar radiation.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Sunliang thank you for your help !<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>kind regards<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Michal Klimas<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> SUNLIANG CAO [mailto:caosunliang@msn.com] <br><b>Sent:</b> Sunday, April 26, 2015 10:42 AM<br><b>To:</b> TRNSYS users mailing list at OneBuilding.org; michal.klimas@put.poznan.pl<br><b>Subject:</b> RE: [TRNSYS-users] Solar radiation comparison<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Calibri","sans-serif"'>Hi, Michal.<br><br>When you compare the measured data with the output from the Type16a, large percentage error in the winter time might be resulting from the wrong input of the ground reflectance (4th input).<br><br>If your applied location in a higher latitude country, such as Northern European countries, during the winter time, the ground diffuse radiation will have a quite higher proportion in the total radiation compared to the summer time. In this situation, the result from Type16a will be more sensitive to the ground reflectance in the winter season than the summer season.<br><br>On the other hand, during the summer season, the proportion of ground diffuse radiation in the total radiation is much lower than that of winter time (because beam radiation will have a much higher proportion), leading to much less percentage error.<br><br>Moreover, the relatively lower total radiation will also make your percentage error higher as the denominator in the percentage error equation is smaller.<br><br>Therefore, try to calibrate your ground reflectance parameters in your model compared to the measured data. In winter time, if there is snow in your applied location, then put a relatively higher ground reflectance, such as 0.7-0.8.<br><br><br>Kind Regards,<br>Sunliang Cao, Dr.,<br>Department of Energy Technology,<br>Aalto University,<br>Finland<br><br><br><o:p></o:p></span></p><div><div class=MsoNormal align=center style='text-align:center'><span style='font-family:"Calibri","sans-serif"'><hr size=2 width="100%" align=center id=stopSpelling></span></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-family:"Calibri","sans-serif"'>From: <a href="mailto:michal.klimas@put.poznan.pl">michal.klimas@put.poznan.pl</a><br>To: <a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a><br>Date: Sun, 26 Apr 2015 07:25:17 +0200<br>Subject: Re: [TRNSYS-users] Solar radiation comparison<o:p></o:p></span></p><div><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Just for clarification.</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>I'm comparing measured solar total tilted radiation with output from Type 16a- <i>Total radiation on surface 1</i>.</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>kind regards</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Michal Klimas</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif";color:#1F497D'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Michał Klimas [<a href="mailto:michal.klimas@put.poznan.pl">mailto:michal.klimas@put.poznan.pl</a>] <br><b>Sent:</b> Saturday, April 25, 2015 4:23 PM<br><b>To:</b> <a href="mailto:trnsys-users@lists.onebuilding.org">trnsys-users@lists.onebuilding.org</a><br><b>Subject:</b> [TRNSYS-users] Solar radiation comparison</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div></div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Dear All,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>I'm having an issue with comparing tilted (45 deg) <b>total solar radiation</b> with<b> measurements</b>. </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>I have connected measured total horizontal radiation to Type16a, and taken as an output <i>Total horizontal radiation</i>.</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>I have a significant difference in January (50%) , February (30%) and December (40%). Remaining months are ok.</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>I have verified the Solar shift time, Latitude and checked whether any radiation occur during night - everything is fine.</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Can anyone suggest any solution ?</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>kind regards</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Michal Klimas</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'> </span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-family:"Calibri","sans-serif"'>Poznan University of Technology</span><span style='font-family:"Calibri","sans-serif"'><o:p></o:p></span></p></div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><br>_______________________________________________ TRNSYS-users mailing list <a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a> <a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></span></p></div></div></div></body></html>