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<p class="MsoNormal"><span lang="EN-US">Hello,<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">After having read the documentation and online help, I am still having trouble with the type 2b and I was wondering if you could please help me out. My problem is the following:<br>
<br>
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I used the example file SDHW, where the Type2b is connected as follows:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Upper limit </span><span lang="EN-US" style="font-size:10.0pt">TH</span><span lang="EN-US"> = solar collector output temperature<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Lower limit </span><span lang="EN-US" style="font-size:10.0pt">TL</span><span lang="EN-US"> = tank to heat source temperature<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Monitoring temperature </span><span lang="EN-US" style="font-size:10.0pt">TIN</span><span lang="EN-US"> = tank to load temperature<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Upper deadband </span><span lang="EN-US" style="font-size:10.0pt">ÄTH</span><span lang="EN-US"> = 15 degrees<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Lower deadband </span><span lang="EN-US" style="font-size:10.0pt">ÄTL</span><span lang="EN-US"> = 0 degrees<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">Then I went through the documented equations (Eq. 4.1-1 to Eq.4.1-4). However in the simulation results, when I take a look at time steps 4064.25 to 4065 (as an example), I find the following:<o:p></o:p></span></p>
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<p class="Default"><span lang="EN-US" style="font-size:10.0pt">Time step<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">4064.25<o:p></o:p></span></p>
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<td width="63" valign="top" style="width:46.95pt;border:none;padding:0cm 5.4pt 0cm 5.4pt;height:8.3pt">
<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">4064.5<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><b><span lang="EN-US" style="font-size:9.0pt">4064.75<o:p></o:p></span></b></p>
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<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">4065<o:p></o:p></span></p>
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<p class="Default"><span lang="EN-US" style="font-size:10.0pt">(TH-TL) <o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">-1.373<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">7.008<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><b><span lang="EN-US" style="font-size:9.0pt">1.618<o:p></o:p></span></b></p>
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<p class="Default" align="center" style="text-align:center"><span lang="EN-US" style="font-size:9.0pt">2.304<o:p></o:p></span></p>
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<p class="Default"><span style="font-size:10.0pt">ã</span><span lang="EN-US" style="font-size:10.0pt">i<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">0<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">0<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><b><span style="font-size:9.0pt">0<o:p></o:p></span></b></p>
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<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">1<o:p></o:p></span></p>
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<p class="Default"><span style="font-size:10.0pt">ã</span><span lang="EN-US" style="font-size:10.0pt">o</span><span style="font-size:10.0pt"><o:p></o:p></span></p>
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<td width="63" style="width:46.95pt;border:none;padding:0cm 5.4pt 0cm 5.4pt;height:8.3pt">
<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">0<o:p></o:p></span></p>
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<td width="63" valign="top" style="width:46.95pt;border:none;padding:0cm 5.4pt 0cm 5.4pt;height:8.3pt">
<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">0<o:p></o:p></span></p>
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<p class="Default" align="center" style="text-align:center"><b><span style="font-size:9.0pt">1<o:p></o:p></span></b></p>
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<p class="Default" align="center" style="text-align:center"><span style="font-size:9.0pt">1<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">From what I see, time step <b>4064.75</b> does not agree with
<b>Eq. 4.1-3 </b>since (TH-TL) is still below the upper deadband even though the controller is turned on (it should remain off until (TH-TL) is greater than or equal to the upper deadband). Maybe I am misreading the input/output controller values?<b><o:p></o:p></b></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any help would be greatly appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thanks,<br>
Ciaran<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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