<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 http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 12 (filtered medium)"> <style>  </style>  </head> <body lang=EN-GB link=blue vlink=purple> <div class=Section1> Iain,<o:p></o:p> <o:p> </o:p> A couple of things to try: <o:p></o:p> <![if !supportLists]>1)      <![endif]>Make sure the building and plant are running at the same time step if not re-run and check if the problem persists.<o:p></o:p> <o:p> </o:p> <![if !supportLists]>2)      <![endif]>Try running the model with no flow network, using the basic plant flow handling. If the ventilation loss disappears then it indicates a substantial bug the plant/building/flow coupling, where a phantom loss of massflow * dT is introduced [dT is the internal-external temperature difference].]<o:p></o:p> <o:p> </o:p> Let me know how you get on an I’ll have a look at the appropriate section of code.   <o:p></o:p> <o:p> </o:p> Nick<o:p></o:p> <div> ---------------------------------------------------<o:p></o:p> Nick Kelly BEng (Hons) PgC MSc PhD FHEA<o:p></o:p> Energy Systems Research Unit<o:p></o:p> Mechanical Engineering<o:p></o:p> University of Strathclyde<o:p></o:p> e: nick@esru.strath.ac.uk<o:p></o:p> t: +44(0)141 548 2854<o:p></o:p> f: +44(0)141 552 5105<o:p></o:p> ---------------------------------------------------<o:p></o:p> </div> <o:p> </o:p> <div> <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 Macdonald, Iain Sent: 09 May 2011 21:29 To: 'esp-r@lists.strath.ac.uk' Subject: [esp-r] Intergrated bld/mfs/plant simulation<o:p></o:p> </div> </div> <o:p> </o:p> I have a ‘simple’ integrated problem with a single thermal zone, a plant description of an AHU and a flow network controlling the AHU fans and % of outdoor air. Strangely the thermal zone shows a ventilation loss of about 2 kW while the AHU fan is on and heating. Can anyone explain this?<o:p></o:p> <o:p> </o:p> Some details:<o:p></o:p> <![if !supportLists]>1)      <![endif]>The heating coil does heat the supply air to its set point (checked in the plant results)<o:p></o:p> <![if !supportLists]>2)      <![endif]>The zone air temperature (from building results) is less than the supply air temperature (from plant results)<o:p></o:p> <![if !supportLists]>3)      <![endif]>The building results show both a sensible heating load and a ventilation loss<o:p></o:p> <![if !supportLists]>4)      <![endif]>Flow results show the fans coming on and off at the correct time and balanced flow into/out of the thermal zone’s node<o:p></o:p> <o:p> </o:p> Any suggestions welcome…<o:p></o:p> <o:p> </o:p> Thanks,<o:p></o:p> <o:p> </o:p> Iain<o:p></o:p> <o:p> </o:p> </div> </body> </html>