[Bldg-sim] IES VE: Radiant, hollow core ceiling

[Minu Agarwal]

Hi Rebecca,

 

What I would is utilise IESs' good capability in modelling building
physics. The hollow concrete slab could be modelled as a narrow,
concrete "plenum" above the zone to be conditioned via the cooled slab.
This "plenum" zone could then be supplied with the evaporatively cooled
air at estimated rate. 

I would not go down the path of chilled beams as they are difficult to
control and esp difficult to monitor in the Vista. Also concrete is not
amongst the material types for chilled ceiling. The heat transfer rate
could get exaggerated with other material types. 

 

Hope this helps.

 

Minu

 

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rebecca
Butler
Sent: Thursday, March 05, 2009 11:50 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] IES VE: Radiant, hollow core ceiling

 

I have a question regarding the capabilities of IES VE and its CFD
package and I was hoping someone might have some experience or insight
to help get me started on the following problem.  We have a concept
cooling design which includes a radiant hollow core concrete ceiling
through which evaporatively cooled air is routed.  The air which is
routed through the radiant ceiling comes from a central evaporative
cooler and is then exhausted at the exterior of each room after it has
passed through the airflow passages in the ceiling.  Just to be clear,
this is not a typical radiant system in that electricity is being used
to cool the slab but instead evaporatively cooled outdoor air is being
used in its place.  We also want to couple these effects with natural
ventilation which occurs because of the use of operable windows.  

We are trying to analyze the effects of these techniques in a cooling
season in Colorado (hence the benefit of the evaporative cooler).  We
have conducted rough calculations of the benefits of using such a system
using standard ASHRAE energy transfer techniques and we want to verify
our results.  Have you ever heard of this type of system being modeled
in IES VE and/or is it capable of modeling such a system?  Is there a
way to modify the "radiant ceiling" option in IES to take into account
the saving which would occur by using evaporatively cooled air in the
place of electricity?  If not, is there a way to manually create such a
system from the ground up?

Any help would be greatly appreciated.  Thank you.

Rebecca Butler
LEED AP
Enermodal Engineering
(303) 861-2070 

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