[esp-r] Re: Slab-on-grade hydronic floor / WCH converging 2-leg junction

[Laouadi, Aziz]

 Hi,

Here is a quick reply.


 
I am trying to create a cubical zone with one embedded slab in each of the six surfaces.
Is this possible in general?

--> Yes, in principle.  Each surface of a zone can have its own radiant system. Caution: If the surface is shared between zones, this may not work well as there was a bug in ESP-r before, where node injection of the other zone having the same radiant surface is not updated automatically?.



To start simple, I reduced the problem to two slabs.
I created two control files which refer to the same zone.
The problem is, that only one control loop can be linked to the zone and therefore only one slab that can be linked to the zone.

--> I am not sure here.  Other users may provide some feedback with regard to zone control.


In consequence, I tried two build the cubical out of several zones. I could link now one control loop to one zone, but now I have problems at component level:

I have the following components in my plant:
- 1 source (air & water temperature source)
- 1 pump
- 2 slabs
- 2 2-leg junctions

--> the radiant model works only with water as a fluid; air fluid is not implemented as far as I know.



As a link between pump and slab I chose the WCH converging 2-leg junction at both ends of a slab.
When I run the simulation, I have problems with the converging 2-leg junction. Can I also use it as a diverging 2-leg junction or do I need a seperate component? I already scanned the component list, but could find only water flow diverger which don't seem to fit.

--> you need to design the loop correctly so that the fluid exiting the source goes to slab1 and slab2 using a diverging junction, then collect the outlet water from both slabs using a converging junction (each junction end links to the outlet of slab), then the total water flow leaving the junction enters the pump then the source.

I hope this splves the problem.

Thanks

A Laouadi 



-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Udo Schuster
Sent: Wednesday, May 30, 2007 5:47 AM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] Slab-on-grade hydronic floor / WCH converging 2-leg junction



Dear all, dear Mr Laouadi,

I am trying to create a cubical zone with one embedded slab in each of the six surfaces.
Is this possible in general?

To start simple, I reduced the problem to two slabs.
I created two control files which refer to the same zone.
The problem is, that only one control loop can be linked to the zone and therefore only one slab that can be linked to the zone.

In consequence, I tried two build the cubical out of several zones. I could link now one control loop to one zone, but now I have problems at component level:

I have the following components in my plant:
- 1 source (air & water temperature source)
- 1 pump
- 2 slabs
- 2 2-leg junctions

As a link between pump and slab I chose the WCH converging 2-leg junction at both ends of a slab.
When I run the simulation, I have problems with the converging 2-leg junction. Can I also use it as a diverging 2-leg junction or do I need a seperate component? I already scanned the component list, but could find only water flow diverger which don't seem to fit.

Can anybody help me?


Kind regards
Udo

--
Dipl.-Ing. (FH) Udo Schuster
Dep. Thermal Systems and Buildings
Fraunhofer-Institut für Solare Energiesysteme ISE Heidenhofstrasse 2, 79110 Freiburg, Germany
Phone: +49(0)761/4588-5309 Fax: +49(0)761/4588-9000 udo.schuster at ise.fraunhofer.de http://www.ise.fraunhofer.de 


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