[Equest-users] HVAC Occupancy Sensors

[Michael Mantai via Equest-users]

I’ve never tried to account for this in a model, although we’ve had several projects connect HVAC to occupancy sensors.  I’m wondering if you could adjust the zone min. airflow setpoint to the lower unoccupied setpoint for 10% of the occupied hours, to kind of match the 10% reduction in LPD per Appendix G.  If the zone temperature setpoint is also reset based on the occupancy sensor, it seems like you could also adjust the temperature setpoint schedules in eQuest to the lower/higher unoccupied settings for 10% of the occupied hours.  My guess is this would have negligible effect on energy savings, but maybe not.

 

From: Equest-users <equest-users-bounces at lists.onebuilding.org> on behalf of Manuela Mengue via Equest-users <equest-users at lists.onebuilding.org>
Reply-To: Manuela Mengue <mmengue at dagherengineering.com>
Date: Thursday, March 16, 2017 at 10:59 AM
To: John Aulbach <jra_sac at yahoo.com>, "'equest-users at lists.onebuilding.org'" <equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] HVAC Occupancy Sensors

 

John,

 

See Appendix G – Table G3.2 (2) Occupancy sensor for Non-24h and <5000 ft2.

 

My question pertained to the HVAC component which achieves additional savings for installing occupancy sensors.

 

Best regards,

 

Manuela Mengue

Design Engineer

 

From: John Aulbach [mailto:jra_sac at yahoo.com] 
Sent: Thursday, March 16, 2017 10:38 AM
To: Manuela Mengue <mmengue at dagherengineering.com>; 'equest-users at lists.onebuilding.org' <equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] HVAC Occupancy Sensors

 

Somewhere, in the mysteries of space, I have always been told to use 15% less lighting for the proposed case for occupancy sensors. I am unsure of the source. ASHRAE ??

 

John R. Aulbach, PE

 

On Thursday, March 16, 2017, 6:02:34 AM PDT, Manuela Mengue via Equest-users <equest-users at lists.onebuilding.org> wrote:

Hi all,

 

Has anyone succeeded to model HVAC occupancy sensors in eQuest? In this project, supply air from AHU units feed into VAV boxes in classrooms. The VAV boxes modulate airflow in accordance to occupancy sensor readings. The ASHRAE Table G3.2 allows us to take credit for lighting controls, however, I could not find guidance on HVAC occupancy sensors for energy models. My first approach would be to adjust occupancy levels in Proposed (how?), but this raises another question: doesn’t LEED require to use the same schedules in Proposed and Baseline?

 

Thanks in advance for your suggestions,

 

Manuela Mengue

Design Engineer

 

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