[Equest-users] Occupany sensors

[Nick Caton]

Hi Fareed,

There are multiple approaches to modeling occupancy sensors in eQuest... I assume you're in the context of lights.

What's appropriate depends on how you have set up your model and to what degree their operation needs to be modeled explicitly.

A few approaches, from simple to involved:

*         Established 90.1 Appendix G approach:  Assign a flat % reduction to the installed LPD for the space(s) with occ sensors (only in those that don't already require them, if you're actually doing a proposed/baseline performance rating).

*         Define alternate fractional schedules that represent hourly operation of lights with and without occ sensors.  This can be approached with a few variations to achieve the same result.  Some choose to apply a % reduction to the schedules instead of the installed watts per space, achieving an identical result.

*         Redefine space occupancy schedules in a manner that makes them appropriate to assign to the lighting loads as well (i.e. setting 1.0 for occupied hours), and use the same schedules for both occupancy and lighting - if accuracy is critical, you'll want to consider moving away from a "whole building" fractional schedule as generated by the wizards and move towards "per space type" scheduling.  In this scenario the hourly occupancy value is multiplied against the installed Watts for each space, so you could correctly account for an occ. sensor's time delay into an unoccupied hour with a fractional value.

More creative (and potentially convoluted) solutions are out there that might fit your model on a case-by-case basis, but the three above are approaches I've used more than once.

~Nick

[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Syed, Fareed
Sent: Wednesday, April 06, 2011 10:03 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Occupany sensors

Hello All,

Is there any way to model occupancy sensors in e-Quest?



Thanks,

Fareed Syed EIT LEED(r) AP
Analytics Specialist

Halcrow Yolles
One South Dearborn
21st Floor
Chicago, IL 60603

tel:       +1 312 212 4430
fax:      +1 312 212 4206
www.halcrowyolles.com<http://www.halcrowyolles.com/>

Sustaining and improving the quality of people's lives







Visit our website at http://www.halcrow.com<http://www.halcrow.com/>

------------------------------------------------------------------------
The contents of this email are confidential, for the sole use
of the intended recipient at the email address to which it has
been addressed and do not give rise to any binding legal
obligation upon Halcrow companies unless subsequently confirmed
on headed business notepaper sent by fax, letter or as an email
attachment.  Whilst reasonable care has been taken to avoid virus
transmission, no responsibility for viruses is taken and it is
your responsibility to carry out such checks as you feel
appropriate.  Emails supplied are as found and there's no
guarantee that the messages contained within the body of the
email have not been edited after receipt. If you receive this
email in error, please contact the sender immediately and delete
the message from your system.
Thank you.
-------------------------------------------------------------------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120411/1b075dc4/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 1459 bytes
Desc: image001.jpg
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120411/1b075dc4/attachment.jpg>