Dear Expert,
In our CS project the owner wants to limit the tenants to a specific HVAC system with under floor air distribution. The MEP engineers have considered a bulk cooling load for the tenant spaces based on occupancy and thermal performance of the envelope.
In the energy model, the design case parameters are considered the same as the base case per standard requirement for Core and shell buildings.
The owner is keen to know whether it is possible to show energy savings in energy model for the tenant areas since he is specifying an efficient HVAC system in these areas?
Secondly in the energy model, is it possible to reduce the volume of the air being cooled because of the UFAD? our energy modeler is unable to find a solution to this issue being raised by the owner.
Your opinion on the above would be highly appreciated.
Thanks and regards
Farhana
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
December 24, 2013 - 8:30 am
You can claim savings related to systems in the tenant spaces if the system has been designed/installed or you include performance parameters in the tenant lease agreement.
What energy modeling software are you using?
farhana imran
Managing PartnerArcchorp Architectural Engineering
December 25, 2013 - 3:28 am
Dear Marcus,
Merry Christmas
Many thanks for your clarification, I was not really expecting a prompt response due to holiday season.
I have to confirm with the modeler but I think he is using one of the older versions of Visual DOE software.
farhana imran
Managing PartnerArcchorp Architectural Engineering
December 26, 2013 - 6:36 am
We are using Visual DOE 4.1.2 software for energy simulation.
The literature of the UFAD system supplier states that the conditioned air is delivered to the occupied six-foot vertical vertical zone whereas the floor to ceiling height is nine feet. Is there a way to limit the cooling volume of the space in the energy model when there is no physical limitation?
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
December 26, 2013 - 9:27 am
You will need to perform a work around for the UFAD. There is one published for eQUEST that you may be able to adopt or you could check with the Visual DOE folks. Since the software cannot model the UFAD directly you will need to do this as an exceptional calculation.
Here is a paper on the subject - http://www.doe2.com/download/Docs/Addison-Nall_UnderfloorAirDistPaper_Re...
This guidebook contains a work around that we have used - http://energydesignresources.com/media/11006108/edr_designguidelines_hva...
farhana imran
Managing PartnerArcchorp Architectural Engineering
December 26, 2013 - 9:38 am
Many thanks