Hi there
My building has full T24 certification.
I take it this will be satisfactory to achieve this Prereq?
Thanks
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NC-2009 EAp2: Minimum Energy Performance
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Title 24
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 29, 2015 - 2:54 pm
Maybe but probably not.
What version of T24? Either way you still need to show a 10% new, 5% renovation savings to meet this prerequisite.
Gaston Viau
1 thumbs up
July 29, 2015 - 4:23 pm
Hi Marcus
Sorry, I should have explained more.
This is in ref to a retrospective 2009 NC LEED certification project. The building in question is now occupied, and we are going through the LEED process.
As part of the process of making this a ''zero net energy'' building, and as part of satisfying the local Californian code, 2013 Title 24 certification was undertaken and achieved.
Is it our understanding that under LEED, one should follow the local regulations if they are more rigorous, of which Title 24 is.
The T24 work shows the build is 35% more energy efficient than the LEED (Ashrae) baseline.
So, this should satisfy this prerequisite no? And also get us awarded under Credit 1 Optimize Energy Perf, no?
One thing that we did want clarity on also was in that Credit, the language useds says ''Whole Building energy Modelling''.
Now, while one of those isnt part of the T24, all the component parts are ie Envelope, Heating, Lighting, HVAC etc is assessed and data metrics under weather condistions produced.
So again, T24 should be fine for this prereq and Credit 1 no?
Many thanks for you help
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 29, 2015 - 4:27 pm
You cannot claim LEED compliance based on a generalized comparison of the relative stringency of the codes. While the average may be 35% the range is far wider. You might be able to convince the reviewer that you meet the prerequisite but that is not a sure thing. You will not be able to claim any points under EAc1 without the modeling results.
Gaston Viau
1 thumbs up
July 29, 2015 - 4:38 pm
Hi Marcus
We wouldnt be claiming anything, doesnt the LEED documentation state ''...use Ashrae or your local code, whichever is more rigorous..'' or something to that effect?
The T24 process produced data metrics on all the items that an Energy Model would have done also, albeit in a slightly different format.
So on both the Prereq and the Credit 1, I am a touch perplexed.
Thoughts?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 29, 2015 - 4:56 pm
You would be claiming that your Title 24-2013 compliance is 35% better than 90.1 as you state above, so you are claiming something.
LEED does make reference to other codes, but that is relative to code compliance in your jurisdiction. That does not substitute for LEED compliance.
So it sounds like you have demonstrated Title 24 compliance prescriptively, correct? If you demonstrated it using the ACM performance path you would already have a model. The model is required for LEED. You have three options - see the credit language above. Virtually all projects choose Option 1. Read the requirements, they are very clear on this subject.
Gaston Viau
1 thumbs up
July 29, 2015 - 5:26 pm
Hi Marcus
Ok great, understood.
I will check what path was used.
Best
Gaston Viau
1 thumbs up
July 29, 2015 - 5:39 pm
Hi Marcus
Ok, the architect used Title 24 2010 and used the Performance Path (Energy Pro).
We have the Title 24 Complaince Report that states the building is 30% better than the T24 baseline.
So you are saying that we also need to show, via the Model, how the building compares to Ashrae?
I ask, because in the above, it states:
''Second, you need to demonstrate a 10% savings (5% for existing buildings) for your designed building compared with a baseline case meeting the minimum requirements of ASHRAE 90.1 (or Title 24-2005, Part 6 for California projects).''
?
Many thanks
Best
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
July 29, 2015 - 5:59 pm
So you have an energy model. Now you just need to run it relative to Title 24-2005. This would work and who ever did the energy model should be familiar with how to do this.
Many California projects do prepare an ASHRAE 90.1-2007 baseline because they tend to score more LEED points that way. But it is up to you which baseline you wish to submit.
Gaston Viau
1 thumbs up
July 29, 2015 - 6:01 pm
Ok, perfect
Many thanks Marcus, appreciated!