<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=DE-CH link=blue vlink=purple> <div class=Section1> Dear Francesco<o:p></o:p> <o:p> </o:p> you have it right for the „traditional” MLC. With this construction type, the gap resistance is not temperature-dependant. However, as of release 11.7 (I think it was), there is a new type called “CFC” (Complex Fenestration Constructions”). This type uses the actual emissivity of the surfaces and calculates temperature-dependant properties for the IGU gap (and has some other quite handy frills). The underlying model / theory etc. is well described in Bartosz Lomanowski’s thesis, available at ESRU.<o:p></o:p> <o:p> </o:p> Regards<o:p></o:p> Achim<o:p></o:p> <o:p> </o:p> <o:p> </o:p> <div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'> From: esp-r-bounces@lists.strath.ac.uk [mailto:esp-r-bounces@lists.strath.ac.uk] On Behalf Of Francesco Frontini Sent: Dienstag, 2. Februar 2010 14:52 To: esp-r@lists.strath.ac.uk Subject: [esp-r] Window u-value temperature dependency in ESPr<o:p></o:p> </div> <o:p> </o:p> Dear ESP-r users,<o:p></o:p> I have a question regarding how ESP-r calculates the properties of a glass unit (for example a double glaze unit with argon gap).<o:p></o:p> I red several discussions about the capability of ESP-r of reading and importing WIS or Window data file, but for me is not clear which kind of data espr effectively read.<o:p></o:p> My knowledge is that, when we specify a glass construction we have to give the resistances of the air gap between the glass panes (that is a fix value) in the construction library and then define the optical properties in the optic database (ESPr ask for the angle dependence absorptances of the different panes and the angle dependence transmittance of the different panes). That´s all! Am I wrong?<o:p></o:p> Now comes the question?<o:p></o:p> How does ESPr calculates the temperature dependency of the air (or gas) gap resistance between the panes? It is not possible to define the emissivity of both glass pane surfaces?<o:p></o:p>  <o:p></o:p> I know that TRNSYS uses the Window 4 model (but, if I correctly remember, TRNSYS is not able to consider not standard emissivities for the outer surfaces).<o:p></o:p>  <o:p></o:p> I have this question because I am modelling a family house room under a tilted roof. The window is a roof window (like Velux). I think that, for such cases, it is relevant to model correctly the temperature dependency (also the wind dependency) of the gas-gap resistance.<o:p></o:p>  <o:p></o:p> Any help is appreciated.<o:p></o:p> Francesco -- Dr. Francesco Frontini, MEng PhD in Buildings Engineering ---------------------------------------- Fraunhofer Institut für Solare Energiesysteme ISE Heidenhofstr. 2, 79110 Freiburg, Germany M1:    [+39] 333-3097826 M2:    [+49] (0)1522-1624691 Phone: [+49] (0)7614588-5358 FAX:   [+49] (0)7614588-9358 @1: <a href="mailto:francesco.frontini@ise.fraunhofer.de">francesco.frontini@ise.fraunhofer.de</a> @2: <a href="mailto:francesco.frontini@polimi.it">francesco.frontini@polimi.it</a> ---------------------------------------- The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you receive this in error, please contact the sender and delete the material from any computer. <o:p></o:p> </div> </body> </html>