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NC-v4 EAp2:Minimum energy performance

Landscape Exterior lighting LPD Mandatory provisions

Hi there,

I am currently calculating the power allowance for exterior lighting in a school project.

In this case, there is quite a lot of exterior spaces and landscaping. Almost one-third of the trees are illuminated, however, I am not sure which could be an acceptable and effective way to measure the illuminated area for the LPD allowance calculation.

As per now I have considered "approximately" the area that will "feel" illuminated. That is about 3m around the trees lighting. I could not find any example nor information about how to perform this calculation.

Have you addressed this issue before successfully? Is it ok to calculate approximately? do you have a method or a recommendation on how to do this calculation?

Thanks

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Profile picture for user neerajsh.2807
Neeraj Sharma
Sustainability Manager
Conserve Solutions- Riyadh, Kingdom of Saudi Arabia
LEEDuser Basic Member
1 thumbs up

Tue, 04/25/2023 - 11:47

What you are doing is okay. Simulations work on a baseline, so whatever are you select provide a narrative and the baseline should match the same area, and you are good to go. 

Tue, 04/25/2023 - 14:13

Hi Neeraj, I am confuse. There is no baseline for exterior lighting, as far as I know it is the same LPD as the proposed. My question was regarding the mandatory provisions from ASHRAE 90.1 - 9.4 and how to measure the illuminated landscape areas. Thanks
Profile picture for user cory.duggin
Cory Duggin
Senior Energy Wizard
TLC Engineering Solutions
LEEDuser Premium Member
44 thumbs up

Tue, 04/25/2023 - 14:17

I have used the aproximate area around the tree that is lit based on the photometrics.
Profile picture for user neerajsh.2807
Neeraj Sharma
Sustainability Manager
Conserve Solutions- Riyadh, Kingdom of Saudi Arabia
LEEDuser Basic Member
1 thumbs up

Sun, 04/30/2023 - 11:03

There is no specific mandatory requirements for exterior however ASHRAE 90.1.2010 only mentions to meet the requirements of table 9.4.3 A & B. If you want to claim savings on exterior lighting, you can but only for tradablesurfaces, non tradable it needs to be same in both the proposed as well as baseline cases. Usually LEED doesn't comment on astonomical switch provided for exterior lighting until the modeler is not claiming savings because of the use of lighting controls .  

Sun, 04/30/2023 - 11:39

Hi Neeraj, The mandatory provisions apply mainly to lighting controls and exterior lighting power densities, including landscape. Maybe i have misunderstood something.
Profile picture for user neerajsh.2807
Neeraj Sharma
Sustainability Manager
Conserve Solutions- Riyadh, Kingdom of Saudi Arabia
LEEDuser Basic Member
1 thumbs up

Tue, 05/02/2023 - 06:34

Just work on the Lighting Power densities, consider savings on tradable surfaces. Skip the control part. LEED doesn't raise a question on it, also all the buildings usually provides an astronomical switch, which is the major requirement. Refer to the Minimum Energy performance calculator lighting tab, you will understand what is required. 

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