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NC-2009 EAp2:Minimum Energy Performance

Taking credit for DCV in car parks

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

Hello Marcus Sheffer, Refering to the LEED Interpretation 10371 related to taking credit for DCV in car parks, it is specified: 1) that the proposed case should be modeled such as that a minimum air flow of 0,05 cfm/ft2 should be maintained; 2) that car park ventilation rate and fan power in the baseline building shall be modeled as 0,75 cfm/ft2 and 0,3 W/cfm, respectively. Can you please tell me the source of the following numbers: a) 0,05 cfm/ft2 as minimum exhaust rates for the proposed building; b) 0,3 W/cfm for the fanpower in the baseline building Thank you in advance, Best regards, Pedro Ribeiro

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 08/16/2016 - 16:46

a. We think the 0.05 comes from the International Mechanical Code 2009 minimum Section 404.2. b. The 0.3 probably comes from the fan power requirements for system 9/10 in 90.1-2010 but we are not sure.
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Ricardo Sá
Director of Sustainability
Edifícios Saudáveis Consultores (503 910 767)
LEEDuser Basic Member
79 thumbs up

Thu, 08/18/2016 - 14:32

Thank you for your response, Marcus! I still have a few questions regarding this matter: a) Can I claim savings with the DCV for car parks ventilation, even though there is a portuguese law (where the project is located) that requires this DCV? (meaning that this is standard practice); b) If not, and since this DCV is standard practice, how do I model the Baseline case? As per ASHRAE 90.1 - 2010? Or as designed? c) If it is as designed, am I right to assume this as process load, since it is not regulated under ASHRAE 90.1 - 2007?
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 08/19/2016 - 16:05

a. No. If it required by local code then that is the baseline in that area. b. Identical to the design. c. Yes it is a process load

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