[Bldg-sim] Automatic Lighting Shutoff Mandatory Provision Question

[Jaigath Chandraprakash]

Thank you very much Nick. I really appreciate your help on this.
 
I really got confused with this when I got a commnet recently saying that the 
"baseline case per section 9.4.1.2 were not modeled" and was asked to revised 
the baseline. So I ended up with no savings. This is in conflict with Table 
G3.1.6 that you have pointed out which says that No automatic lighting controls 
shall be modeled in the baseline building design. 

Does it mean that I am wrong when I applied also 10% savings to my baseline? 
This is where I got confused since 9.4.1.1.b also mentions occupant sensor that 
shall turn lighting off within 30 mins of occupant leaving the space. 





________________________________
From: Nick Caton <ncaton at smithboucher.com>
To: Jaigath Chandraprakash <cjaigath at yahoo.com>; bldg-sim at lists.onebuilding.org
Sent: Mon, October 4, 2010 10:38:08 PM
Subject: RE: [Bldg-sim] Automatic Lighting Shutoff Mandatory Provision Question


Jaigath,
 
Appendix G allows us to take credit for automatic controls in addition to 
(beyond) what’s required in 9.4.1 for minimum compliance.  One of the options 
here is to have programmable (time-of-day) shutoff for interior lighting 
circuits, and you can infer from between Table G3.1 and G3.2 of Appendix G that 
baseline models are taken to feature only such timeclock controls for automatic 
shutoff.  Further, it’s taken that the lighting scheduling being kept identical 
between the proposed and baseline adequately reflects the minimum requirements, 
so you aren’t supposed to try to explicitly model the programmable shutoff.  
 
If you have occupancy sensors throughout a building which only requires 
programmable shutoff, that’s an example of having automatic controls beyond what 
9.4.1 requires – and you’d get to take 10% off your proposed LPD in all spaces 
where such short-term shutoff isn’t already required (per following section 
9.4.1.2).
 
Note Table G3.2 also has a corresponding distinction between building smaller 
than and larger than 5,000ft2 – offering more credit for buildings using a means 
of automatic shutoff where no such controls are even minimally required.
 
~Nick
 
NICK CATON, E.I.T.
PROJECT ENGINEER
25501 west valley parkway
direct 913 344.0036
fax 913 345.0617
Check out our new web-site @ www.smithboucher.com
olathe ks 66061
 
From:bldg-sim-bounces at lists.onebuilding.org 
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jaigath 
Chandraprakash
Sent: Monday, October 04, 2010 9:01 AM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Automatic Lighting Shutoff Mandatory Provision Question
 
Hello All,
 
I am confused on the mandatory provision 9.4.1.1 which states that building 
larger than 5000 ft2 shall have automatic control device. Does it mean 
that mid-rise and high rise building cannot claim for credit in occupancy 
sensors shown in Table G3.2 because their GFA is more than 5000 ft2 and only 
small office can claim for this credit? I am sure I am not interpreting this 
section correct since from what I read, other modelers  are claiming for savings 
for buildings with more than 5000 ft2 area for occupancy sensors even if 
mandatory requirements states that this is required which means baseline 
building will also have occupancy sensors.
 
Can someone correct me on this? 
 
Thank you,
 
 
C. Jaigath 


      
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