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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You’ll probably be better off using a simple feedback controller rather than an equation block because you can get frequent starts and stops or non-convergence warnings. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Also, that’s a pretty large temperature range to operate over. Are you driving an absorption chiller with those temperatures? <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>You might be better off controlling a variable speed pump to maintain your temperature range rather than shutting the pump off when the temperature exceeds 80C. If you shut off the pump when the temperature is over 80C, you risk exceeding the stagnation temperature of your panels in the real world. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There is a solar thermal panel in the TESS libraries that has a built in controller that has an output for a variable speed pump that works really well. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Good luck!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Fred<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'><tr><td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#660000;text-transform:uppercase'>Fred Betz</span></b><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> </span></b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'>PhD., LEED AP <br></span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#333333;text-transform:uppercase'>Sustainable Systems Analyst</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'><o:p></o:p></span></p></td><td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> <o:p></o:p></span></p></td><td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'>AEI</span></b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> | AFFILIATED ENGINEERS, INC. <br>5802 Research Park Blvd. | Madison, WI 53719<br><br></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'>P: 608.236.1175 | F: 608.238.2614</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> <br></span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'><a href="mailto:fbetz@aeieng.com"><span style='color:#660000;text-decoration:none'>fbetz@aeieng.com</span></a> | </span><b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'><a href="http://www.aeieng.com/"><span style='color:#660000;text-decoration:none'>www.aeieng.com</span></a></span></b><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Shahrdad JavidRad [mailto:shahrdad@live.de] <br><b>Sent:</b> Tuesday, February 22, 2011 12:11 PM<br><b>To:</b> TRNSYS USERS<br><b>Subject:</b> [TRNSYS-users] acceptable temperature range<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br>Hello,<br><br>in my solar thermal system </span><span class=hps><span lang=EN style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>I</span></span><span lang=EN style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <span class=hps>want to</span> <span class=hps>define</span> <span class=hps>an</span> <span class=hps>acceptable</span> <span class=hps>interval</span> <span class=hps>for</span> <span class=hps>the collector</span> <span class=hps>outlet</span> <span class=hps>temperature</span> <span class=hps>[65-80°C]</span> by giving an output signal=1 for the pump in the collector loop. For any other temperatures out of this range </span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>the signal should be=0<br></span><span lang=EN style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br><span class=hps>For</span><span class=shorttext> </span><span class=hps>this</span><span class=shorttext> </span><span class=hps>purpose I am using an Equation block!! (Is there any controller, that is able to do it?)</span></span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><br><br>I have defined these variables as:<br><br>T_min=65<br>T_max=80<br>T_out= collector outlet temperature<br><br>Signal=AND(GT(T_out,T_min),LT(T_out,T_max))*1+(1-AND(GT(T_out,T_min),LT(T_out,T_max)))*0<br><br>I have plotted the signal. It works fine but I am experiencing a very long simulation time. More than 15 minutes just for a week.<br><br>Is there any idea?<br><br>Thanks,<br>Shahrdad<br><br><o:p></o:p></span></p></div></body></html>