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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear Trnsys users, <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I’v modelled a multi-zone none-residential building in TRNbuild with HVAC system which is modeled separately in Trnsys.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>In order to implement a CO2 based demand controlled ventilation, I need to insert airflow between different zones as well as calculation of CO2 concentration for each zone which can be then connected to the controller of HVAC system.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have 2 questions:air <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><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span lang=EN-US>Regarding airflow between zones/ air coupling, I applied air coupling function in Trnbuild but the zone-temperatures changed a lot and they somehow got overheated although the air flow rates were given according to the technical documents, how can I solve this problem ? <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><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span lang=EN-US>Regarding CO2 based DCV Since I have no experience with Trnflow, I would like to know if anybody has any idea about it. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks in advance !<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Best Regards, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Hamidreza Esfehani <o:p></o:p></span></p></div></body></html>