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Re: [TRNSYS-users] Active Wall Layer: Number of loops and Autosegmentation

Marshall,
 Usually the way radiant floors are set up is that there is a manifold from which a number of parallel flow loops depart. The "looping back and forth" (ie the path of a given piping loop through the floor) is built into the model's algorithms. In setting up the floor, you specified a pipe to pipe distance and in setting up the floor, you specified an area. In order to figure out how long each pipe is, the model needs to know how many parallel loops there are. There is an equation in the 06-Multizone Building manual that shows how you can calculate the number of loops from the floor area, pipe length, and pipe-to-pipe distance.

  I think in the example that you give, you'd have a single fluid inlet and 2 loops. The 25 times doesn't matter to the model. Segmentation is only necessary in order to keep the specific mass flow rate of liquid high enough to be in the range of the model.

Kind regards,
 David


Marshall L Sweet/sweetml/O/VCU wrote:
TRNSYS users,

Does anyone know what the actual physical meaning of "number of fluid loops" when defining and active layer? 

If I want to model a radiant heated floor that had 1 fluid input but that input looped back and forth 25 times in a zone, would the number of loops then be 25?

What if I had a zone that had two fluid inputs and both inputs looped back and forth 25 times each?

Also I have been unable to get the autosegmentation feature to put my floor in segments.  When I click the "DO" button it still says no segmentation, is this because maybe my zones are small enough that they don't need segmented or is something wrong? 


Thanks,

Marshall
 

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