Dear All,
I am modeling a project which still has no exterior lighting design (the owner will decide on this when the building is almost complete).
In the preliminary design review, I put the values of ASHRAE 90.1 table 9.4.5 identically in the baseline and proposed scenario, but I got the below comment from the USGBC (I didn't initially indicate that there was no exterior lighting design):
"Provide a narrative confirming that the Proposed Case exterior lighting reflects the actual building design and the Baseline Case reflects the allowed lighting power from Section 9".
What is the best way to proceed with the energy model calculations?
Shall I just leave the external lighting values as blank, and put a note that there is currently no design (perhaps I can update the EAp2 form in the LEED Construction Phase Review)?
Thanks!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
February 20, 2015 - 9:17 am
You must model the actual exterior lighting. If you did not have any exterior lighting design then you probably should have deferred EAp2 until the construction preliminary review phase. It sounds very strange to not design the exterior lighting yet. How do they know where to run the wires during construction to account for the exterior fixtures?!? This does not sound to me like something that could be decided at the end of construction.
You really should wait to resubmit until the exterior lighting is designed. You could try telling the owner to get moving as it is delaying the LEED submission. Even though USGBC says you have 25 days to respond you really can take as long as you want (just ask for an extension).
The major problem here is that exterior lighting is a mandatory provision. You cannot earn this prerequisite unless you meet all of the mandatory provisions. So EAp2 cannot be earned unless you will have no exterior lighting or you show that your exterior lighting complies.
You should not wait until the construction preliminary phase because EAp2 cannot be approved without the exterior lighting design so it would be denied in the design final review and you would then have to pay extra for an appeal.