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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear esp-r users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a question regarding the optical database of esp-r.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>If I open one of the exemplar models (e.g. basic 1 zone with convective heating & basic control), I have a model that uses external double glazing construction ‘’dbl_glz’’. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>From the database maintenance-> Constructions db -> dbl_glz I can see that my construction has an optical property ‘’DCF7671_06nb’’<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Surprisingly this optical property is not in the optical database ‘’optics.db2’’. The only optical properties available are S properties (‘’SC_8985’’ up to ‘’SAZ5060’’). However, the simulation can be performed normally, even though the construction and optical properties do not match.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The weird thing is that if I go to the ‘’surface attributes’’ and change the current glazing construction dbl_glz but select the same construction again, then I get an error message (Optics in geo file do not match etc….). Even though I use the same construction as before.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>In the esp-r database folder there are two optical properties databases, db1 and db2. In db1 there are only S properties and in db2 there are all the properties (S and D). Strangely, even though in the esp-r menu the optical database is ‘’optics.db2’’, the values are the one from db1 (only S properties)! If I change the optical database to db2 the simulation can be run without errors.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My question is how can the initial simulation be run with different construction and optical properties and why in esp-r I see only S optical properties since in optics.db2 there are S and D properties?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am using esp-r 11.9 through cygwin in windows 7 32bit.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you,<o:p></o:p></p><p class=MsoNormal>Georgios Sigalas<o:p></o:p></p></div></body></html>