[Equest-users] Lighting Control - Occupancy Sensor

[Li, Lan]

 "User's Manual for ANSI/ASHRAE/IESNA standard 90.1-2004" page G-18
says " Occupant sensors alone for a combination of occupancy sensors and
programmable timing controls have a 15% power adjustment factor for
daytime occupancies and building less than or equal to 4000 ft^2. The
power adjustment factor is 10% for all other  buildings. "  I think the
key is " Power adjustment factor".  Please advise if my understanding is
right. 

 

Thanks!

 

Lan

 

 

 

Lan Li, PE

Mechanical Engineer

Scheeser Buckley Mayfield LLC                                     

1540 Corporate Woods Parkway

Uniontown, OH 44685

Phone: (330) 896-4664 ext. 123

Cell: (330) 904-6292

Fax: (330) 896-9180

lli at sbmce.com <mailto:lli at sbmce.com> 

www.sbmce.com <http://www.sbmce.com/> 

 

Columbus Branch Office (614) 448-1498

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Thank you

________________________________

From: Carol Gardner [mailto:cmg750 at gmail.com] 
Sent: Monday, July 12, 2010 12:46 PM
To: Nick Caton
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Lighting Control - Occupancy Sensor

 

Nick,

For occupancy sensors, I have always reduced the % on in the lighting
schedules, never the installed LPD. Here's a thread from way back
discussing how to do this:
http://www.gard.com/ml/bldg-sim-archive/msg02168.html. 

If the methodology has changed to reducing the LPD by 15% I'd like to
know. It would be much easier and I'd love to be wrong!

How are others doing this?

Carol

On Mon, Jul 12, 2010 at 7:42 AM, Nick Caton <ncaton at smithboucher.com>
wrote:

A small correction - the reduction (0-15%) is modifying the installed
LPD (W/SF), not the schedules.  The reduction amount does vary based on
the table Carol referenced in 90.1 Appendix G.  

 

This is easiest to do in the wizards: there's an overall multiplier,
defaulted to 1.00, on the bottom of lighting load screen.  In detailed
it would require you to modify the space LPD values in the spreadsheet
view, under the Internal Loads tab.

 

Agreeing with Carol's premise though - the way your question is worded
suggests you weren't clear on the contents Appendix G.  For your own
sake, definitely avoid relying on others to tell you what's within 90.1
or you might find yourself in hot water down the road ;).

 

~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
<http://www.smithboucher.com>  

 

From: equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] On Behalf Of Carol Gardner
Sent: Sunday, July 11, 2010 5:27 PM
To: Derek Huang
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Lighting Control - Occupancy Sensor

 

For the spaces that don't require occupancy sensors you can show savings
by modifying the lighting schedule. I think a 15% reduction is allowed,
but verify that by looking in Appendix G where it tells you what you can
do and when. In fact it would be good for you to make a practice of
researching the answers to these types of questions yourself and save
the more complicated questions for the listserv. It is important to
respect everyone's time and do diligence by trying to find the answers
yourself. I know it's a lot to process at first but you will benefit
from the study.

Regards,
Carol

On Sat, Jul 10, 2010 at 6:21 PM, Derek Huang <Derek.Huang at atce.com>
wrote:

Does anyone know if there is a spot for Occupancy Sensor lighting
controls ? In both of DD Wizard mode and Detailed Data Edit mode, I
didn't see any.

 

Thanks,

 

Derek Huang, LEED AP, CPD                                       

Mechanical Engineer

 

Error! Filename not specified.

 

97 E. Brokaw Road, No 300

San Jose, CA 95112

Direct: 408 487-1305

Fax:      408 436-1511

www.atce.com <http://www.atce.com/> 

derek.huang at atce.com

 

 


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-- 
Carol Gardner PE




-- 
Carol Gardner PE

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