[Equest-users] Lighting Controls for LEED

[Jeremy Poling]

Just a note: the adjustment in Table G3.2 does NOT apply to spaces
mandated to have those controls under 9.4.1 - it only applies to spaces
where these controls are optional.  Table G3.1(6) says:

 

"g. For automatic lighting controls in addition to those required for
minimum code compliance under Section 9.4.1, credit may be taken for
automatically controlled systems by reducing the connected lighting
power by the applicable percentages listed in Table G3.2.
Alternatively, credit may be taken for these devices by modifying the
lighting schedules used for the proposed design, provided that credible
technical documentation for the modifications are provided to the rating
authority."

 

(italics as used in the referenced standard)

 

There is quite a bit of discussion on Table G3.2 in the list archives
that you can browse.  You can adjust the LPD in your proposed model (not
baseline - baseline does not include the controls) or instead you can
explain to the reviewers the methodology you used to determine the
occupancy schedule and why it is appropriate that the lighting schedule
mirror the occupancy schedule for rooms with controls.  No need to run
the model if you have the evidence to support your method and your
method is allowed by Appendix G, which it clearly is in Table
G3.1(6)(g).

 

Your review comment does bring up an interesting point: the language in
the standard is not absolute.  Appendix G does not explicitly state that
you are required to take credit for occupancy controls and therefore
include them in the model, it only states that you MAY take credit for
them.  The model is more conservative if credit is not taken for
occupancy controls.  If you have much less than a clear picture of how
the occupants are going to use the building you should weigh the
uncertainty of the occupancy inputs against the energy reduction
achieved by including the controls in the model.  You may determine that
it is not appropriate to include occupancy control savings in the model
and the language in the standard would support that decision.

 

Jeremy R. Poling, PE, LEED AP+BDC



 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Grammy
Sent: Wednesday, March 23, 2011 12:13 AM
To: MatthewRLarson at eaton.com
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Lighting Controls for LEED

 

Reducing the lighting power density is a easy for you and acceptable for
USGBC way.

On Tue, Mar 22, 2011 at 9:43 PM, <MatthewRLarson at eaton.com> wrote:

Michael,

 

There are a couple different ways to account for occupancy sensors for
LEED but you need to follow Appendix G Table G3.2 of ASHRAE 90.1.  

 

 

 

Basically you're allowed to reduce the lighting by the percentage listed
in the above table, 10% for most buildings.  You can do this by either
reducing the lighting power input for the spaces by 10% under the
Internal Loads tab or create a lighting occupancy sensor schedule that
has hourly fractions that are 10% less than your regular lighting
schedule.  You also need to make sure that you apply this lighting
credit to any spaces that are required by minimum code to have automatic
lighting controls specified under Section 9.4.1.  Table G3.1 Number 6
has a good explanation of this process for the baseline and proposed
building.

 

Thanks,

 

Matthew Larson, LEED AP BD+C
Project Engineer

Energy Solutions Group

E M C Engineers, Inc.
Eaton's Electrical Services & Systems 
143 Union Blvd, Suite 350
Lakewood, CO 80228
tel: +1 303 328-3419
mobile: +1 303 668-2511
fax: +1 303 974-1239

MatthewRLarson at Eaton.com 
www.eaton.com/energysolutions  

 

 

From: equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] On Behalf Of M. Shields
Sent: Tuesday, March 22, 2011 6:24 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Lighting Controls for LEED

 

Hi All,

 

I just got back comments on my models for a LEED project and the
reviewer commented that I needed to account for occupancy sensors.  I
had done this by switching the lighting schedule to the occupancy
schedule in rooms with occupancy sensors, does anyone know if this is an
appropriate way to model occupancy sensors?  Is there a tool built into
equest that allows you to account for them a different way?

 

Thanks in advance,

 

____________________________
Michael Shields
Facility Strategies Group, LLC

1012 Market Street, Suite 307

Fort Mill, SC 29708

Phone: 803-493-4507

Fax: 803-548-2511
Email: mshields at fstrategies.com

 


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