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Re: [EnergyPlus_Support] hollow core slabs

Dear James,

I have read in the website of EnergyPlus http://apps1.eere.energy.gov/buildings/energyplus/energyplus_archives.cfm that it is possible to model hollowcore slabs since version 3 in the ZoneHVAC:VentilatedSlab:SlabGroup but I do not know exactly how to make it as a layer of a thicker slab which has a heated floor and provides no ventilation. 
Do you know if this is possible?

Secondly, I saw that in EnergyPlus v8 is possiple to apply multiple tubing circuits in a slab. However, I use Designbuilder v3 which connects only to EnergyPlus v7. Is there a possibility to convert the idf files from Designbuilder from EnergyPlus version 7 to  EnergyPlus version 8?

Thank you in advance
Athinodoros Tzoulis


On Sunday, November 3, 2013 8:50 PM, Jim Dirkes <jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Dear Athinodoros,
EnergyPlus cannot model non-homogeneous layers such as the hollow core slab.  That layer should be modeled with the correct mass (thickness + density) and an average conductance.
The embedded pipes are not something I have modeled, but I believe that there are several radiant floor objects that will work for you.  Look into object names such as ZoneHVAC:LowTemperatureRadiant:ConstantFlow.
James V Dirkes II, PE, BEMP, LEED AP
Energy Analysis, Commissioning & Training Services
1631 Acacia Drive, Grand Rapids, MI 49504 USA
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Athinodoros Tzoulis
Sent: Sunday, November 03, 2013 12:18 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] hollow core slabs [1 Attachment]
Hi all, 
I have 2 questions. 
1) I would like to model a hollow core slab in a room and above it a concrete layer with embedded water pipes for concrete core activation. 
Is there a possibility to do it in EnergyPlus? 
I have seen a possibility to do it in but as a ventilated slab. However I don't want ventilation in the room. 
2) I have modelled a room with a heated floor inside a solid concrete slab. 
Is it possible to separate the system in 2 or more loops within the slab. So, having embedded tubes in the slab in the whole slab but having more than 2 water inlet and outlet nodes (as it is in reality)? (see pic) 
Is there a possibility to model this system with virtual partitions? 
Best regards, 
Athinodoros Tzoulis 


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