[Equest-users] Lighting Control - Occupancy Sensor

[Demba Ndiaye]

Reducing the installed LPD or reducing the schedules by the same percentages yield the same results. However, it is far easier to just reduce the LPD.

______________
Demba NDIAYE

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Li, Lan
Sent: Monday, July 12, 2010 2:36 PM
To: Carol Gardner; Nick Caton
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Lighting Control - Occupancy Sensor

 "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
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Scheeser Buckley Mayfield LLC
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________________________________
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<mailto: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

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From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto: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<mailto: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<mailto: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

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Carol Gardner PE



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Carol Gardner PE
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