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NC-2009 EAp2:Minimum Energy Performance

Baseline ventilation rates

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TOMAS URIBE
PROJECT MANAGER
SOLUCIONES ENERGETICAS SOSTENIBLES
LEEDuser Basic Member
7 thumbs up

When the project is pursuing the increase ventilation which ventilation rates have to be used for the baseline 62.1 or 62.1 + 30%? I am working in LEED V2009. ASHRAE 90.1-2007

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Laura Brandt
Mechanical Engineer
Luckett & Farley
LEEDuser Basic Member
4 thumbs up

Mon, 08/24/2015 - 23:08

Hi Tomas, The baseline ventilation rates must match the proposed ventilation rates per A90.1 paragraph G3.1.2.5. The only exception to this is when modeling demand control ventilation, if it is not required in the baseline per section 6.4.3.8. So, if you are designing for increased ventilation, your baseline will also have the increased ventilation.
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TOMAS URIBE
PROJECT MANAGER
SOLUCIONES ENERGETICAS SOSTENIBLES
LEEDuser Basic Member
7 thumbs up

Tue, 08/25/2015 - 16:27

Thanks Laura. I was asking that because I am using a sofware that autogenerate baseline model. However for the baseline, it always uses 62.1 ventilation rates even though I used 62.1+30% in the proposed model. I contacted the sofware support. They told me that baseline builder used to match the airflows with IEQc2, but they received comments from USGBC saying that the baseline should not have the increased airflow for the EAc1 analysis. Now I had to increase the BL ventilation rates manually.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 08/25/2015 - 17:26

In 90.1-2007 Laura is correct. In 90.1-2010 the baseline is 62.1 and the proposed is as designed. Maybe the software is confusing the two?

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