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NC-2009 EAp2:Minimum Energy Performance

Exterioir Lighting - Non tradable

Greetings, In the project I'm modeling, in the Proposed project there is a Building facades exterior lighting which LPD is bigger than the allowed values of 0.2 W/ft2. This lighting however is a special illumination which is controlled by separate control device independent of the other lighting systems. The question is: How to enter it in the Table 1.4.3B. Thanks.

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Mon, 12/01/2014 - 15:03

Non-tradable is modeled identically. If the proposed is greater than the Baseline allowance then model the same value as in the proposed in the baseline. Make sure your total exterior lighting is less than the overall baseline allowance (tradable + non-tradable) since exterior lighting is a mandatory provision.

Mon, 12/01/2014 - 15:13

Thanks for the reply. I've checked the total value and no matter that the Proposed facade is bigger then allowed, the total is less then the Baseline totals. At such situation which value to enter in the simulation - the project one or the max allowed. Thanks.
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 12/01/2014 - 16:11

For the non-tradable the value should be identical based on the proposed value. For the tradable model the proposed as designed and the baseline per the ASHRAE allowance.

Tue, 12/02/2014 - 06:38

Thanks for the reply. Final question to this issue: If finally lighting facade of the Proposed makes the total exterior lighting bigger than BAseline, but in the same time the Proposed facades lighting is with characteristic corresponding to the exceptions specified in 9.4.5 b, how to enter the data in the table 1.4.3.B and refer to the mentioned exception . Thanks
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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 12/02/2014 - 14:29

In general facade lighting would not qualify under 9.4.5b unless it is illuminating a sign. If some of the exterior lighting qualifies under a 9.4.5 exception then it gets modeled identically in both models. Information on the exempted lighting would get entered in the Additional Notes box below the exterior lighting tables in Section 1.4.3B. Fully explain the purpose and area coverage as well as the wattage. If this covers a large area you should consider providing a separate document to explain how it qualifies for the exception.

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