1. I would like to confirm one thing regarding Lighting Power Density Reduction calculations. What is Gross Lighted Floor area that should be used in Building Area Method calculations? In case of office tenant space is Gross Lighted Area equal to gross tenant area (including exterior and interior walls)?
2. I also would like to ask another question regarding different office project. Lighting is not in tenant's scope of work, because it's already good enough and its power is around 20% below lighting power allowance specified by ASHRAE. The tenat won't change anything connected to lighting so he won't e.g. install occupancy sensors to control lighting nor other things mentioned in section 9 of ASHRAE. The question is if the project can still get points under EA Cre 1.1 if lighting wasn't in tenant's scope of work?
Bill Swanson
Sr. Electrical EngineerIntegrated Design Solutions
LEEDuser Expert
734 thumbs up
November 9, 2012 - 4:55 pm
1) The Gross Lighted Floor area is measured from the exterior faces of exterior walls or from the centerline of wall separating interior areas. This is per the 90.1 User's Manual.
2) What do you mean the lighting is not in the tenant's scope of work? Is this a new construction CI project are an EBOM project? In new construction, all of the lights have to comply with ASHRAE 90.1 requirements. Wall switch sensors are fairly inexpensive to install for small rooms. And adding a couple ceiling sensors to control existing lighting for larger spaces should break a projects budget.
Adam Targowski
OwnerATsec
103 thumbs up
November 12, 2012 - 6:06 am
1) Thank you for the clarification.
2) The client will move to a new office space in an existing building. They were not planning to change existing lighting (the lighting fixtures are good enough but there are no occupancy sensors). That's why I wrote that lighting was not in tenant's scope of work.
From what I understand a project has to comply only with these requirements that fall within tenant's scope of work. So if they are not going to change old lighting then they don't have to comply with ASHRAE requirements regarding lighting, is that right?
And if they are not changing lighting fixtures nor adding occupancy sensors (ligthing power density of existing lighting is 15% better than ASHRAE requirements) can they get points under EAc1.1?
Bill Swanson
Sr. Electrical EngineerIntegrated Design Solutions
LEEDuser Expert
734 thumbs up
November 13, 2012 - 8:25 am
There was a similar ruling recently that seems to apply here.
5/9/2011 ID# 10051
I would be careful though. If you are claiming the lighting and controls are existing and outside of your scope of work, then you should not be able to claim the 15% energy savings from the existing lighting. You've just argued it's outside your scope of work. That's just my opinion.