we have recently submitted the LEED V3 NC project for review , our project is office building so entire project has been reflected with a lighting power density (LPD) of 1.0 W per square foot in the Baseline model but the review comment was different

Review Comment:-

"using the Building Area Method, a separate LPD value for each major building type must be reflected in the Baseline model using Table 9.5.1. In this case, an LPD value of 1.0, 0.8, 1.3, and 0.3W per square foot must be reflected for the office, warehouse, manufacturing facility, and parking garage portions of the building, respectively. For future projects, if using the Building Area Method, ensure that the appropriate LPD value from Table 9.5.1 is reflected for each major building type in the actual design"

So my Doubts are

1.is it needed to model the each space with different building type as per ASHRAE 9.5.1 ???

2.is it correct to model the same interior LPD for Building ????

now we have lot of confusion after getting this review comment kindly help us how to respond this review

additional Explanation needed for below Queries

i.Building are method for Interior LPD is vary for Each space or Each Building ??????

ii. we have two building in site and each building have 56 spaces each but both working function is different so we have modelled with different LPD for both building A. is it correct ???? B.is it required to model those 56 spaces with different LPD as per ASHRAE 9.5.1

*we have followed Building area method for Basecase Interior LPD

Post a reply

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Fri, 02/02/2018 - 23:05

It sounds like you need to correct the models. 1. Yes, if those distinct space types include a significant area of the building. 2. Under the building area method you are supposed to model each space in the building identically within that building type and you are supposed to model all building types that apply. Note that Section 9.5.1 indicates types in c and d, not just one building type. This will often provide some gray area so you need to apply some common sense. In your case the project sounds like it has those 4 distinct building types. Many of those building types within your building could be operating on different schedules so that would be an indicator that a different type may be necessary. If the building types within your project has significantly different LPD requirements that would also be an indicator. It is certainly not fair to model an office building with a parking garage as all office in the baseline and the proposed is a combination, for example. We almost always use the space-by-space method as it is far more accurate and usually generates more savings.

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.

You are currently logged in under an enterprise account

FAQs about EAp2 :

Building Area Method - Interior LPD

You rely on LEEDuser. Can we rely on you?

Add new comment