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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear TRNSYS-Users,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I have a little problem to control my floor-heating- and cooling-system:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I use Type22 – Iterative feedback controller – to regulate the massflowrate of the floor-system.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The inlet temperature is controlled by the mean outside temperature of the day before.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>In times when the floor is used for cooling the building, the Type22-controller works perfectly.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>But in times when heating is needed, the controller doesn’t use the threshold-function to stop the massflow if the rooms are getting too hot (because of internal gains). <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Think for example at a room in winter with outside temperature about 0°C. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>In the night and in the early hours there will be a heating demand, so an inlet-temperature of about 22°C is used for heating. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>When the room is used (with lots of internal gains) the inlet temperature of 22°C is used for cooling!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>The problem is that you cannot control both (heating and cooling).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Also by adding an on/off command to type22 (like: off when Tair > Twanted – I tried a lot more) doesn’t work.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>See also the attached graph (I hope you can understand the problem).<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Does someone have experiences with that problem to solve this problem?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>I would be very pleased for any help!<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Thank you in advanced.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal style='line-height:115%'><span style='color:#1F497D'>Kind regards / </span><span style='color:#1F497D'>Freundliche Grüße<o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='line-height:115%'><span style='color:#1F497D'>i.A. Dipl.-Ing.(FH) Daniel Bader<o:p></o:p></span></p><p class=MsoNormal style='line-height:115%'><b><span style='color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='color:#1F497D'>GN Bauphysik Ingenieurgesellschaft mbH</span></b><b><span style='color:#1F497D'><o:p></o:p></span></b></p><p class=MsoNormal><span style='color:#1F497D'>Bahnhofstr. 27<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>70372 Stuttgart<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Tel.: 0711-9548800<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Fax: 0711-564613<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="blocked::http://www.gn-bauphysik.com/" title="http://www.gn-bauphysik.com/">www.gn-bauphysik.com</a></span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Geschäftsführer: Dipl.-Ing. (FH) Manfred Finkenberger<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'>Sitz der Gesellschaft: Stuttgart, HRB 14870<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><img border=0 width=129 height=55 id="Bild_x0020_1" src="cid:image003.jpg@01CBFB86.A8FA8190" alt="Beschreibung: Beschreibung: W:\GN\Zertifizierung-Planer am Bau\TÜV-Stempel.JPG"></span><span style='font-size:8.0pt;color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;color:#1F497D'>Diese E-Mail enthält vertrauliche und/oder rechtlich geschützte Informationen. Wenn Sie nicht der richtige Adressat<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;color:#1F497D'>sind oder diese E-Mail irrtümlich erhalten haben, informieren Sie bitte sofort den Absender und vernichten Sie diese<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;color:#1F497D'>Mail. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail ist nicht gestattet.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:8.0pt;color:#1F497D'>This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:8.0pt;color:#1F497D'>received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorized copying,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span lang=EN-GB style='font-size:8.0pt;color:#1F497D'>disclosure or distribution of the material in this e-mail is strictly forbidden.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-GB style='font-size:8.0pt;color:black'><o:p> </o:p></span></p></div></div></body></html>