Forum discussion
CS-2009 EAp2: Minimum Energy Performance
I'm modeling a commercial building. The business rooms are all leased, and will have an air conditioning system.
What is the value of efficiency in the proposed model should I use? The ASHRAE 90.1-2007 as value?
That can not be bad, considering that the gains will be smaller?
Thank you!
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Can SHGC be higher in the proposed than in the baseline model?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 28, 2014 - 10:33 am
If a design exists, the Proposed is modeled as designed (see Table G3.1-1 and G3.1-7). The Baseline is according to Appendix G.
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
August 28, 2014 - 10:43 am
Thank you Marcus!
I know about that, but the point is that there is not a project for commercial offices.
It will be the responsibility of the renter and we indicate the parameters in the lease aggrement.
In this case, my proposed model (commercial offices) should have efficiencies as ASHRAE?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 28, 2014 - 11:16 am
So if the spaces are not designed and you do not have specific requirements that effect the energy use of the HVAC design in the tenant lease agreement, then you model the HVAC identical to the Baseline system. So yes in this scenario the efficiency would be the ASHRAE minimum.
It is not clear from your post what specific HVAC parameters are in the lease agreement.
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
August 28, 2014 - 12:16 pm
When i said parameters, is about the COP of equipments according to the system type.
Now i understand.
Tks for all!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 28, 2014 - 12:21 pm
If you require a minimum efficiency higher than the ASHRAE minimum in the lease agreement then you can claim energy savings for this parameter.
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
August 28, 2014 - 12:54 pm
In this case, I could use a minimum efficiency value greater than the ASHRAE, and the lease agremment indicate that this value should be the minimum that the tenant must meet in your project?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
August 28, 2014 - 1:03 pm
I think we are saying the same thing, so yes.
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
August 28, 2014 - 1:08 pm
So understood.
Thank you Marcus!
Ian McCall
Environmental Engineer13 thumbs up
October 28, 2014 - 6:10 am
Hello, I'm just jumping on the end of your conversation. We have done the Design Stage Energy Performance simulation with known and unknown HVAC equipment for a multi-use Core & Shell building. Can you confirm that we do not need to re-submit this simulation at Construction Stage.
Thank-you,
Ian
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 2, 2014 - 6:32 pm
If anything changed during construction that affected the modeling results you are required to adjust the models and resubmit them. The same holds true for any credit. If nothing changed it does not get resubmitted.