I am currently involved in a 200,000SF LEED-CI 2009 project in California. To achieve credit EAc1.3, can title 24-2008 be used in lieu of ASHRAE 90.1-2007? Any advice will be appreciated. Thank you!!
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Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
March 16, 2012 - 2:17 pm
Leticia,
You can use T24 in California. I assume you are pursing the energy modeling option. Check out the NC EAp2, EAc1 forums. There is a lot of good info there.
Leticia SooHoo
Architect, Senior Project ManagerIA Interior Architects
68 thumbs up
March 16, 2012 - 2:25 pm
Thanks Dylan. I know for NC and Core and shell, projects can submit T24 compliance in lieu of ASHRAE 90.1-2007. And yes, most of it is done through energy modeling.
Question: since this is a CI project (tenant improvement), most likely the T24 compliance will be done through prescriptive compliance. In this case it will be CA Title 24-2010.
In a couple of my previous CI projects pursuing EAc1.1 (Lighting Controls), we could not use T24 in lieu of ASHRAE. So I think the logic also extends to EAc1.3.
What do you think?
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
March 16, 2012 - 2:28 pm
Unfortunately, no.
You will need to prove that you are 15% better T24-2008 or ASHRAE 90.1-2007 to achieve the minimum of 5 points for this credit. Using Title 24-2010 (although it is more stringent) is not approved to prove that you are 15% better than ASHRAE 90.1-2007.
Unless you are using efficient systems and creating an energy model then I would suggest attempting Option 1.
Leticia SooHoo
Architect, Senior Project ManagerIA Interior Architects
68 thumbs up
March 16, 2012 - 2:30 pm
Thanks for the input. You have pursued this credit (CI EAc1.3) using T-24 2008 prescriptive compliance with success, as long as it is 15% better?
Dylan Connelly
Mechanical EngineerIntegral Group
LEEDuser Expert
472 thumbs up
March 16, 2012 - 2:47 pm
If you are going to prove 15% better than T-24 2008 or 2010 than you need to create an energy model and go the "Performance" route.
Prescriptive - Bare minimum measures to meet code (Eg. insulation is bare minimum, window to wall ratio meets current code, systems are per code minimums, installing only the code maximum amount of lighting.) One way to look at it, is that this is the worst building you can legally build.
Performance - Proving through an energy model that your building will perform 15% better than a code minimum building. (Eg. your insulation is much better than code, but you might use more windows than allowed by code, you can reduce the amount of lights you are using and use high efficiency HVAC systems and your total builiding energy use for a year will be 15% less than a code building.)