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NC-v4 EAc2:Optimize energy performance

ASHRAE 90.1.2010 and unmet hours

Hello to all,

I have following questions concerning  ASHRAE 90.1.2010 and unmet hours:

  1. The proposed building  according to G3.1.2.3 shall not exceed the 300  unmet hours. The 50 h between the proposed and the baseline is removed from 2010.  Is there any other restriction concerning unmet hours  between the proposed and the baseline?
  2. In Chapter 11 of  ASHRAE 90.1.2010  in 11.3.2  at i is mentioned “The unmet hours for the proposed building  shall not exceed the unmet hours for the budget building”.  What is meant by “budget building” ?  Does chapter 11 concern us when building our energy model?
  3. Must the Proposed building have the same thermostat throttling range with the baseline building? According Table F-1 it must be the same.

Thank you very much

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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
79 thumbs up

Thu, 10/18/2018 - 13:28

Please see section G.3.1.2.3 of ASHRAE 90.1-2010, where requirements associated with unmet load hours are exposed (300 unmet load hours per year are still allowed).
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Thu, 10/18/2018 - 14:10

1. No 2. Budget building and baseline building are the same idea. Section 11 is the performance path for code compliance and is not used for demonstrating LEED compliance. So it does not apply to LEED projects. 3. Yes

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