[esp-r] Re: "slab-on-grade hydronic floor" to activate concret slabs

[Hall Monika]

Dear Mr. Laouadi,
 
I checked your numeration with my model. I have 2 layers of concret:
 
1 layer: concret
2 layer: concret with pipes placed in the centre
 
With your numeration the pipes are at node 5, but my model does not work with node 5, it works with node 4.
 
After doing some research in the book of Mr. Clark and the thesis of Mr. Nakhi it is clear:
"Each layer of material is represented by two surface nodes and one central node. The two surface nodes at the layer interface are combined into one heterogeneous control volumen represented by a central node." (Nakhi)
 
That means for my model
Layer 1: node 1 (surfac in contact with ground or air), node 2 (centre), node 3 (surface in contact with layer 2)
Layer 2: node 3 (surface in contact with layer 1), node 4 (centre with pipes), node 5 (surface in contact with air)
 
Best regards
Monika
 


________________________________

From: Laouadi, Aziz [mailto:Abdelaziz.Laouadi at nrc-cnrc.gc.ca] 
Sent: Wednesday, May 09, 2007 3:46 PM
To: Hall Monika; esp-r at lists.strath.ac.uk
Subject: RE: [esp-r] "slab-on-grade hydronic floor" to activate concret slabs


Dear Monika,
 
The "injection node number" means the node in the construction layer where heat is injected in or retrieved from (in other words, the position of the water pipe in the layer).  Note that ESP-r uses three nodes per construction layer and the node numbering starts from the exterior.
 
Example: insulated slab on grade:
 
Layer 1- insulation in contact with ground: node 1 (surface in contact with ground, 2 (centre) and 3 (surface in contact with slab).
Layer 2-concrete slab in contact with interior environment: node 4 (surface in contact with insulation, 5 (centre) and 6 (surface in contact with room air).
 
So if pipes are placed in the centre of slab, the injection node number will then be 5.
 
Note, you may add additional layers on top of slab, or you may sub-divide a thick slab into a number of sublayers to get more accurate results.  In this case, just follow the node numbering as explained above or in ESP-r manual.
 
I hope this helps.
 
 
A. Laouadi
 

________________________________

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Hall Monika
Sent: Wednesday, May 09, 2007 7:40 AM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] "slab-on-grade hydronic floor" to activate concret slabs


 
Dear esp-r users,
 
I use the plant component "slab-on-grade hydronic floor" to activate concret slabs. Does anybody know what the parameter " Injection node number (integer)" means? 
 
I down loaded the report from Mr Laouadi:
"Development of a radiant heating and cooling model for building energy simulation software", but I did not found what it could be.
 
It would be nice, if somebody could help me.
 
Best regards
Monika
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