Dear users,<br><br>I'm writing a user Type for trnsys and I' facing a problem. <br>Xe is an input of the type (outside relative humidity).<br>Xsouffl is an output and can be equal to 0 or to Xe while another condition is equal to 0.<br>
<br>Here, the condition is equal to 0 and Xsouffl should be equal to Xe or to 0 which is fast the case...<br>You can see in the table below, a move back of one time step between the value of Xe and the value of Xsouffl. And sometimes the move back disapears. I didn't found any rules and I don't know where this problem could come from.<br>


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  <p class="MsoNormal"><span style="color:black">TIME                   
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  <p class="MsoNormal"><span style="color:black">Xsouffl c</span></p>
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  <p class="MsoNormal"><span style="color:black">Xe   </span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00625815</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00617362</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">3</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0061206</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00613734</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00612341</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">6</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00606683</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">7</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00607641</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">8</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00612489</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">9</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00612489</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00612833</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">10</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0063213</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0063213</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">11</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0064191</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">12</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0064191</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00654528</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">13</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00654528</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0066564</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.0066564</span></p>
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  <p class="MsoNormal" style="text-align:right" align="right"><span style="color:black">0.00674369</span></p>
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<p class="MsoNormal"> Here is the fortran code concerning Xsouffl :</p><p class="MsoNormal"><br></p>

    If (Qsouffl.GT.(0)) then<br><br>        if((signalBF.EQ.(1)).and.(Trec_postvent>Tsouffl)) then<br>            If(Xfr<Xext) then<br>                Xsouffl = max((Xfr-Xext)/(T_point_froid-Trec_postvent)*Tsouffl+(T_point_froid*Xext-Xfr*Trec_postvent)/(T_point_froid-Trec_postvent),Xfr)<br>
            else<br>                Xsouffl = Xext<br>            endif<br>        else<br>            Xsouffl = Xext<br>        endif<br>    <br>    else<br>            Xsouffl = 0<br><br>    Endif<br><br><br>Do you have any idea ?<br>
<br>Best,<br><br>Ewen<br>