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Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

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Our process load is higher than 25%. Do we have to justify that?

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Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

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The Section 9 space-by-space method does not include residential space types. What should I use?

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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

ASHRAE 90.1 2007 vs 2013

Hi all. Can we use latest standard of ASHRAE 90.1 2013 instead of 2007 as stipulated at reference guide? Noted that the latest standard will have more stringent requirement.

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Tue, 03/15/2016 - 10:23

There is an interpretation concerning the use of the ASHRAE 90.1-2010 for LEED 2009 projects: http://www.usgbc.org/content/10421 I have never heard about the use of ASHRAE 90.1-2013 for LEED 2009 projects. Why would you like to use v. 2013?
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Marcus Sheffer
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7group / Energy Opportunities
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Wed, 03/16/2016 - 00:37

I do not believe that USGBC has developed an interpolation table related to 90.1-2013 yet.

Wed, 03/16/2016 - 01:33

Hi all, the reason is we are planning to use some assumption at ASHRAE 90.1 User Manual for our Energy Modelling. Since we can't purchase the older version. We only can purchase 2013 version. Any idea whether there is any implication on using ASHRAE 90.1 - 2013 User Manuals?
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Marcus Sheffer
LEED Fellow
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LEEDuser Expert
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Wed, 03/16/2016 - 01:59

You can purchase older version here. https://www.ashrae.org/resources--publications/bookstore/standard-90-1-document-history

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