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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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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Meeting ASHRAE 90.1 COP Requirement in Proposed Case Energy Simulation

We recently received a comment from USGBC LEED that we have to meet ASHRAE 90.1 COP requirement in proposed case energy simulation as well. However, we got approval for several projects in past without this COP criteria in proposed case.

Can we model proposed case chiller COP at ARI condition lesser than ASHRAE Standard 90.1-2007, Table 6.8.1C. Kindly, please advise on the same.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 12/26/2017 - 18:11

Short answer is no. Everyone needs to realize that just because something was approved on a previous project it does not mean that it will always be approved on subsequent projects. Not all issues are identified on every review. This is like saying I got away with speeding on the highway dozens of times before so why are you giving me a ticket now? The system efficiency of the equipment installed in the project is a mandatory provision of 90.1. LEED requires that all mandatory provisions must be met in order to meet the prerequisite for minimum energy performance. So you can model it below the required minimum efficiency but this provision is not avalable for trade-off since it is mandatory. Only the prescriptive requirements of the standard are available for trade-off.

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