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

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@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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