<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Dear All,</DIV>
<DIV> </DIV>
<DIV>I am doing Radiance simulations in atrium well with higher surface reflectances ( 0.6 ~ 0.8 ~ 1, diffuse surface). </DIV>
<DIV>But according to "<SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman">Aizlewood M, Butt J, Isaac K & Littlefair P. <I>Daylight in atria: a comparison of measurement, theory and simulation: </I><SPAN style="mso-spacerun: yes"> </SPAN><I>Proceedings Lux Europa.</I> <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:City w:st="on">Amsterdam</st1:City></st1:place>, 1997." </FONT></SPAN><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman">and </FONT></SPAN><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman">"<SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman;
mso-bidi-font-family: Times-Roman">Littlefair P. Daylight prediction in atrium buildings. <I>Solar Energy</I>, 2002; 73: 105-109.", Radiance underestimated the reflected light (Internal reflected component) in atria with high reflectance (some measurements in the paper used a reflectance 0.85 and got the biggest discrepancy in IRC was 4.87). My some simulations got the similar results: simulations underestimated the measurement with reflectance 0.6 and 0.8 and the higher of surface reflectance the bigger is the discrepancy. All the studies used overcast sky model and set a higher ambient parameter setting.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">Could you help me explain the divergence from high reflectance simulation using Radiance. Also, i</SPAN></FONT></SPAN><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">f these demonstrate Radiance simulation could bring some bigger errors to the dayligthing simulation in high reflectance environment?</SPAN></FONT></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">BTW, I will appreciate it very much if you could share some experience or knowledge and give some suggestion about higher reflectance simulations.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">Cheers</SPAN></FONT></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">Jiangtao</SPAN></FONT></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"></SPAN></FONT></SPAN> </DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman"><FONT face="Times New Roman"><SPAN style="FONT-SIZE: 10pt; LINE-HEIGHT: 150%; FONT-FAMILY: Times-Roman; mso-bidi-font-family: Times-Roman">PhD student in University of Sheffield</SPAN></DIV><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></td></tr></table><br>