<div dir="ltr"><p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif;background-image:initial;background-position:initial;background-size:initial;background-repeat:initial;background-origin:initial;background-clip:initial">Hello,</span><span lang="EN-US"></span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Is there any
solution for the large amount of time taken to simulate a building with
couplings when working with humidity ?</span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif"> </span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">I get the
following warnings every timestep :</span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Small internal
timesteps (<0.1% of simulation timestep) used for humidity calculations due
to large coupling air flows between zones!</span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif"> </span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">I tried every
possible solution to my knowledge :</span></p>

<ol style="margin-top:0cm;margin-bottom:0cm" start="1" type="1">
 <li class="gmail-MsoListParagraph" style="font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Reduce the simulation
     timestep</span></li>
 <li class="gmail-MsoListParagraph" style="font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Increased the number of
     warnings before error</span></li>
 <li class="gmail-MsoListParagraph" style="font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Increase tolerance convergence</span></li>
 <li class="gmail-MsoListParagraph" style="font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">I even reduced the number
     of zones to approximately 1/3 (from 72 to 27)</span></li>
</ol>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif"> </span></p>

<p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Thank you.</span></p><p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif"><br></span></p><p class="MsoNormal" style="margin:0cm;font-size:11pt;font-family:Calibri,sans-serif"><span lang="EN-US" style="font-size:12pt;font-family:Arial,sans-serif">Mohamed</span></p></div>