[TRNSYS-users] Simulation of false ceiling: influence on inertia

[David BRADLEY]

Joke,
  This came up yesterday as well (how to make a coupling air flow across 
a virtual surface) and I unfortunately don't know the answer. I am 
looking into it and will let you know what I learn.
Best,
  David


On 10/18/2011 11:23, Joke De Beuckelaer wrote:
>
> David,
>
> Thanks for the answer. But the problem is that it isn't a 100% false 
> ceiling but about 70%.
>
> So what do I do with the "air - air contact" between the two zones.
>
> 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?
>
> Greetings,
>
> Joke
>
> ------------------------------------------------------------------------
> *Van:* David BRADLEY [d.bradley at tess-inc.com]
> *Verzonden:* maandag 17 oktober 2011 18:38
> *Aan:* Joke De Beuckelaer
> *CC:* TRNSYS-users
> *Onderwerp:* Re: [TRNSYS-users] Simulation of false ceiling: influence 
> on inertia
>
> Joke,
>  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.
> best,
>  David
>
>
> On 10/14/2011 03:44, Joke De Beuckelaer wrote:
>>
>> Dear all,
>>
>> Can anyone help me what’s the best way to simulate a suspended false 
>> ceiling?
>>
>> 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.
>>
>> I want to know the percentage of suspended false ceiling is possible 
>> in order to have still enough inertia from the concrete ceiling.
>>
>> 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?
>>
>> 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?
>>
>> Will it take into account the less availability of the inertia of the 
>> concrete ceiling?
>>
>> Hoping for an answer,
>>
>> Joke De Beuckelaer
>>
>> project engineer mep
>>
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> -- 
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 22 North Carroll Street - suite 370
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475
> d.bradley at tess-inc.com
>
> http://www.tess-inc.com
> http://www.trnsys.com
>
> * ALWAYS LOOKING FOR GREAT PEOPLE *****
>
> ****DISCLAIMER****
> This communication is confidential and for the sole useof the 
> addressee. If you are not the intended recipient,
> please immediately notify the sender by e-mail at the address shown 
> and then delete it from your system
> without copying, disclosing or forwarding its contents. Thank you.
>

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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