<span style='font-family:Verdana'><span style='font-size:12px'>And what about this message I get in the List file ?<br />
Message : TRNFLOW multi zone air flow model integrated<br />
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I use Trnsys17 and as far as I know there is no TRNFLOW installed.<br />
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<span style="font-family:Verdana"><span style="font-size:12px">----- Message d'origine -----</span></span></p>
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<span style="font-family:Verdana"><span style="font-size:12px">De : David BRADLEY</span></span></p>
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<span style="font-family:Verdana"><span style="font-size:12px">Envoyés : 15.04.11 20:47</span></span></p>
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<span style="font-family:Verdana"><span style="font-size:12px">À : pseudomino@gmx.com</span></span></p>
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<span style="font-family:Verdana"><span style="font-size:12px">Objet : Re: [TRNSYS-users] Convection in a simple two storey zone</span></span></p>
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The Type56 model by itself does not calculate any interzonal air flow (ie the buoyancy of warmer air is not accounted for). Type56 allows you to specify coupling airflow between zones. Calculation of the coupling airflow must be done by integrating Type56's thermal solution with TRNFlow, COMIS, or Type97 (Contam). The effect you are seeing is only due to a change between the star-network (simple) radiation model and the gebhardt factor (detailed) radiation model now available in Type56.<br />
Kind regards,<br />
David<br />
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On 4/14/2011 09:46, <a class="moz-txt-link-abbreviated" href="mailto:pseudomino@gmx.com" >pseudomino@gmx.com</a> wrote:
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<span style="font-family: Verdana;"><span style="font-size: 12px;"><span style="font-family: verdana;"><span style="font-size: 12px;">Hi,<br />
<br />
In Trnsys 17, I made a very simple test : two little air-nodes superposed, forming part of a thermal zone.<br />
There is only one windows facing south, at the first floor. I ditn't made anything else.<br />
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<strong>Case 1 : Simple radiation model</strong><br />
Quite realistically, the second floor is warmer.<br />
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<strong>Case 2 : Detailed radiation model</strong><br />
The 2 air-nodes have their temperatures centered around the same value and very near, except that the first floor has more extreme temperature variations.<br />
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I want to illustrate the hot air elevation by a simple example, but I'm not sure of the phenomenon that are taken into account.<br />
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Thank you !</span></span></span></span>
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David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
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