[Bldg-sim] Automatic Lighting Shutoff Mandatory Provision Question

[Nick Caton]

The hard and fast rule I follow is that baseline LPD’s are never to be messed with.  Any and all credit taken for lighting controls is a deduction of LPD (or sufficiently documented schedule adjustment, I suppose) in the proposed case. 

 

It can get confusing, but in specific spaces (i.e. classrooms), 9.4.1.2 may require occ. sensors.  In such a case, I don’t take a credit in the baseline (see hard/fast rule above), but instead remove the credit otherwise taken for that space in the proposed case.    

 

~Nick

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

From: Jaigath Chandraprakash [mailto:cjaigath at yahoo.com] 
Sent: Monday, October 04, 2010 8:32 PM
To: Nick Caton; bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Automatic Lighting Shutoff Mandatory Provision Question

 

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

Error! Filename not specified.

 

NICK CATON, E.I.T.

PROJECT ENGINEER

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

Check out our new web-site @ www.smithboucher.com 

 

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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