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NC-2009 EAp2:Minimum Energy Performance

Baseline Garage Ventilation

Greetings, In our project (registered as per LEEDv2009) there are several garage ventilations. According to ASHRAE 62.1-2007, the garage exhaust rate is to be sized to 0.75 cfm/ sq.ft. In the Proposed model, the rate of the actual project however is sized to the local norms which is less than those of the standard. Additionally there is a CO control sensors, which setting is on a CO concentration of 20 mg/m3. From other site, the minimum air flow of the Proposed is always greater than 0.05 cfm/ sq.ft. as per the requirement of CIR 10371. The question is: Are there any circumstances that prevent entering the garage rate in the Baseline as per the standard and at the same time to enter the garage ventilation rate in the Proposed as per the actual design. You support is highly appreciated. Thanks.

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Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 06/26/2017 - 14:03

Sounds like you got it. Just follow the guidance in the interpretation when claiming savings for DCV in a parking garage.

Mon, 06/26/2017 - 17:41

Hi Marcus, Thanks for the reply. Just one more question to this issue. How to calculate the fan power for the Baseline Garage exhaust. The air flow rate is clear, but the fan power? Probably it should be like for System 9/10 - CFM x 0.3. Thanks
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 06/26/2017 - 18:43

Baseline system fan power shall be calculated at 0.3 watts per CFM.

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