[bldg-sim] Occupancy Sensors

[Sheila Sagerer]

Bill-

We have received credit for occupancy sensors in LEED projects when they are
submitted under the Exceptional Calculation Method.  This requires an
additional energy model run.  First, we run the proposed and ASHRAE models
without the occupancy sensors and use this data for the Post-processed data
and the ECB table.  Then we run a proposed with the credit for occupancy
sensors.  The difference between the proposed and the proposed w/ occ
sensors is detailed on an extra line at the end of the ECB table (like for
renewable energy).  Our submittal includes a narrative detailing how the
credits were calculated and applied to the last run.

Regards,
Sheila Sagerer
Energy Engineer, LEED AP
Energy Opportunities, Inc
Ph: 717-880-9069
Fax: 717-291-9497



-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Bill
Talbert
Sent: Friday, January 21, 2005 11:57 AM
To: bldg-sim at gard.com
Subject: [bldg-sim] Occupancy Sensors


Does anyone have experience obtaining LEED credit for energy savings due
to occupancy sensors? ASHRAE 90.1-1999 requires automatic lighting
shutoff control (9.2.1.1) and occupancy sensors are one strategy for
meeting this requirement. Addendum e to 90.1-2001 allows power
adjustment percentages for the use of 'automatic lighting controls in
addition to those required  for minimum code compliance.' If occupancy
sensors are used for meeting the automatic shutoff control requirement
with no additional shutoff controls provided, then my interpretation is
that no energy savings credit can be taken. If anyone has a different
interpretation or has had success achieving LEED credits, please let me
know.  I am not aware of the USGBC adopting 90.1-2001 Addendum e yet,
but if there is an opportunity to achieve savings through the use of
occupancy sensors, it could be accomplished through the Exceptional
Calculation Methods outlined in A90.1-1999 (11.5). Any assistance would
be appreciated.
Thanks,


Bill Talbert, LEED AP
Mechanical Engineer
Phone: (608) 441-6677
E-mail: btalbert at aeieng.com

Affiliated Engineers Inc.
5802 Research Park Blvd.
Madison, WI. 53719
Tel. (608) 238-2616
Fax. (608) 238-2614

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