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Re: [TRNSYS-users] suspended ceilings



Jörg,
If there is a large plenum space above the suspended ceiling and particularly if the plenum extends over more than one thermal zone, the approach that I have often used is to define the plenum as a separate thermal zone and model the suspended ceiling as a "resistance only" layer separating the actual zone from the plenum zone. I think that if you add an air layer as part of your wall, you are assuming that the air is stagnant; stagnant air is a very good thermal insulator. If the space between the suspended ceiling and the concrete is thick (even only as thick as 30cm or so) then the air in it is not going to be stagnant at all and so therefore won't be as good an insulator as it is getting credit for being.
Kind regards,
 David


On 8/16/2011 04:22, Jörg Braasch wrote:
Hello,
I want to simulate a building with suspended ceilings. To do this I will ad the layer of the suspended ceiling and a layer of air to the concrete ceiling. I also substract the volume between the ceiling from the volume of the room.

Does anyone have experience in simulating with suspended ceilings? I am not sure if I can do it this way.

Thanks

Regards
Joerg

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