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</o:shapelayout></xml><![endif]--></head><body lang=FR link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hello everybody,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I'm a new trnsys user…<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>Currently, I simulates an heating coil (type 670) with fan (type 662) regulated by a PID type 23. I fixed an input temperature outside, incoming air flow, HR, pressure and inlet fluid temperature of heating coil.<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>My goal is to analyze the functioning of the PID 23. It regulates the heating coil fluid flow rate by comparing the output temperature of the fan to a set temperature <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>(gain Kp = 10 ^-4 and Ti = 10 ^-4; Td = 0).<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>By several simulations, I noticed that:<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>_The time step simulation is significant in the convergence of the regulator (Doesn't it perform iterations between each time step?). A large time step does not allow the system converge.<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><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>_Acting on the gain of the PID, convergence can be possible! Do you know why there is a dependency of these two parameters?<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><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>_PID values, gain and Ti (integration time) are not to my knowledge in the orders of magnitude of value of real PID of this system... why this difference in value?<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>If you have some information and/or model working fine about the PID 23...<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!!!<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 style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>LIBIOT</span><span lang=EN-US style='color:#0070C0'> Erwan<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>Bouygues Batiment International<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>service mechanical</span><span style='color:#0070C0'><br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>01.30.60.56.66</span><span style='color:#0070C0'><br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#0070C0'>06.78.02.81.97<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#4F6228'><a href="mailto:s.datcu@bouygues-construction.com"><span style='color:#4F6228'>e.libiot@bouygues-construction.com</span></a></span><span style='color:#4F6228'> </span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#4F6228'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div><PRE>
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