<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Hello Lars,</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <br> </div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> Using multi sensor of loops controller is a way forward:</div> <div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <ol> <li>Define a dummy connection in your flow network (ideally a connection between nodes that are already linked, the component for this connection should have a high resistance (small area) so that it does not matter much if this connection is open or shut)</li><li>Define an on-off controller. The sensed parameter is the external temperature, the actuated parameter is the connection of step 1 and the control law is ON if node temperature is higher than ambient.<br> </li><li>Define another on-off controller. This time sense ambient temperature and control the connection of step 1 to ON if ambient temperature is higher than set point target.<br> </li><li>Define a multisensor (of loops) controller. This controller senses the state of previously defined control loops instead of physical parameters like temperature, RH etc. and has the ability to perform logical AND/OR/NOT operations on the sensed conditions (loops). Use sensed condition as on/off state of control loop of step 2 AND step 3. The actuator is the connection (window) that you want to control.</li><li>Control more windows with the multisensor of loops controller but as SLAVE of loop defined in step 4 (standard help text explains available options)<br> </li></ol> <div>I'll try to find and send you an example of this tomorrow.</div> <div><br> </div> <div>Having said all this it might be that you don't need the above and it will suffice to put just a simple controller that opens the window if ambient is lower than internal node temperature. You may have to put a period of validity though so that it is active only in the summer.<br> </div> <div><br> </div> <div>Regards,</div> <div>Aizaz <br> </div> </div> <div id="appendonsend"></div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> esp-r-bounces@lists.strath.ac.uk <esp-r-bounces@lists.strath.ac.uk> on behalf of Lars O. Grobe <grobe@gmx.net><br> <b>Sent:</b> 13 January 2020 19:56<br> <b>To:</b> ESP-r List <esp-r@lists.strath.ac.uk><br> <b>Subject:</b> [esp-r] Setting up a comparative flow network control</font> <div> </div> </div> <div class="BodyFragment"><font size="2"><span style="font-size:11pt;"> <div class="PlainText">Dear all,<br> <br> I am just finding my way through the setup of a flow network<br> representing a natural ventilation setting for a single-sided space. I<br> made some progress with the door component (which does not contain the<br> "bidirectional" string and is therefore a bit hard to find when working<br> with the cook-book) and a multi-sensor to model a user opening windows<br> when zone temperature is too high, and external temperature is lower<br> than the target. This seems to work.<br> <br> What I was not able to solve so far is a behavior where the occupant<br> would open the window even if the external temperature is higher than<br> the target, but lower than the zone temperature. This is what I would<br> expect in case of a non-cooled building.<br> <br> Is there some whay to trigger a control if the outdoor is lower than the<br> zone temeprature? Can I do that with multi-sensor, or do I need a<br> parallel connection for this case?<br> <br> Best, Lars.<br> <br> <br> _______________________________________________<br> esp-r mailing list<br> esp-r@lists.strath.ac.uk<br> <a href="http://lists.strath.ac.uk/mailman/listinfo/esp-r">http://lists.strath.ac.uk/mailman/listinfo/esp-r</a><br> </div> </span></font></div> </body> </html>