<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Jan,<div><br></div><div>Yes it is possible but before you go down that route it’s important to understand if your variable T is impacted by the result of X. If T is the ambient temperature for example then X doesn’t affect it and you can use equations. If T is the temperature in a piping network and X is the flow rate then using equations will likely cause convergence errors and you are better off using differential controllers.</div><div><br></div><div>But if we assume that T isn’t affected by X then we simply use Boolean equations </div><div><br></div><div>X1 = LT(T,5)</div><div>X2 = GE(T,5)*LT(T,15)</div><div>X3 = GE(T,15)</div><div>X = X1*1 + X2*2 + X3*3</div><div><br></div><div>Jeff <br><br><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On Apr 7, 2022, at 7:00 AM, Böttner, Jan via TRNSYS-users <trnsys-users@lists.onebuilding.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal">Hey everyone,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">i found this entry about implementing if else statements: <a href="http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2013-February/024732.html">
http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/2013-February/024732.html</a><br>
<br>
I’m wondering if ist possible to extend this to an if elseif else statement.<br>
<br>
I want the output X to be X=1 if the temperature is t<5, X=2 for t>=5.and.t<15 and X=3 for t>=15.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I tried this, but it’s wrong and doesnt work:<br>
X = GT(T,GT(T,15)*S+(1-GT(T,15))*U)*U+(1-GT(T,5))*W with S=3,U=2and W=1.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If anyone knows a solution i’d appreciate it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards<br>
Jan<o:p></o:p></p>
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