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<p>David,</p>
<p> </p>
<p>Thanks for the answer. But the problem is that it isn't a 100% false ceiling but about 70%.</p>
<p>So what do I do with the "air - air contact" between the two zones.</p>
<p>Does Trnsys takes this into account when I model it with a virtual surface in google sketchup or do the airnodes then have to belong to the same thermal zone?</p>
<p> </p>
<p>Greetings,</p>
<p>Joke</p>
<p> </p>
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<div id="divRpF259461" style="direction:ltr"><font color="#000000" size="2" face="Tahoma"><b>Van:</b> David BRADLEY [d.bradley@tess-inc.com]<br>
<b>Verzonden:</b> maandag 17 oktober 2011 18:38<br>
<b>Aan:</b> Joke De Beuckelaer<br>
<b>CC:</b> TRNSYS-users<br>
<b>Onderwerp:</b> Re: [TRNSYS-users] Simulation of false ceiling: influence on inertia<br>
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<div>Joke,<br>
I like to simulate this situation as two thermal zones; the conditioned zone below and the plenum zone above. Because the suspended ceiling basically has no mass to it, I simulate it as a wall made up of a single purely resistive (ie massless) layer.<br>
best,<br>
David<br>
<br>
<br>
On 10/14/2011 03:44, Joke De Beuckelaer wrote:
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<p class="MsoNormal"><span style="font-family:'Arial','sans-serif'; font-size:9pt">Dear all,</span></p>
<p class="MsoNormal"><span style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">Can anyone help me what’s the best way to simulate a suspended false ceiling?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">The goal is to simulate a class room where the comfort is assured by using night ventilation. However for acoustic reasons we need a false ceiling.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">I want to know the percentage of suspended false ceiling is possible in order to have still enough inertia from the concrete ceiling.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">Is the best way just to define two different types of ceiling (1. A concrete ceiling and 2.a false ceiling (concrete + air layer + false ceiling)) or has anyone
another idea?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">Is it possible to draw for example some obstructions in Google sketch up and then to define 3 air nodes in trnsys. One air node above the suspended false ceiling;
one air node in the middle of the room and one air node representing the opening window?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">Will it take into account the less availability of the inertia of the concrete ceiling?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt">Hoping for an answer,</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:'Arial','sans-serif'; font-size:9pt"></span> </p>
<p class="MsoNormal"><span lang="NL-BE" style="font-family:'Arial','sans-serif'; color:black; font-size:9pt">Joke De Beuckelaer</span><span lang="NL-BE" style="color:black"></span></p>
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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