[Equest-users] HVAC Occupancy Sensors

[Yang, Eric NOR via Equest-users]

In the past, I defined the custom schedule for VAV min. flow schedule, trying to closely capture the occupancy pattern.    However, this is for energy saving project, not for LEED.

Best regards,

Eric Yang, P.E. CEM.  LEED AP®
ASHRAE HBDP CPMP CEAP
Federal Group
NORESCO
2750 Prosperity Avenue, Suite 130
Fairfax, Va, 22031
Phone 703.846.9700 ex 25 |  Cell 202-802-1849  |  eyang at noresco.com
www.noresco.com

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From: John Aulbach via Equest-users [mailto:equest-users at lists.onebuilding.org]
Sent: Thursday, March 16, 2017 12:30 PM
To: Michael Mantai; Manuela Mengue; 'equest-users at lists.onebuilding.org'
Subject: Re: [Equest-users] HVAC Occupancy Sensors

Too early in the morning for deep thinking.Wait for Nick Caton for best answer.

One can manipulate airflow (and outdoor air) by hour for one's purpose. How much energy savings is questionable.

If you have a VAV system, airflow will automatically reduce when load reduces. Might be the best way to simulate it, even if you have no VAV. Just keep people and lighting at same level, until an unoccupied period happens.

John

On Thursday, March 16, 2017, 9:00:21 AM PDT, Michael Mantai <mmantai at systemworcx.com<mailto:mmantai at systemworcx.com>> wrote:

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<mailto:equest-users-bounces at lists.onebuilding.org>> on behalf of Manuela Mengue via Equest-users <equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>>
Reply-To: Manuela Mengue <mmengue at dagherengineering.com<mailto:mmengue at dagherengineering.com>>
Date: Thursday, March 16, 2017 at 10:59 AM
To: John Aulbach <jra_sac at yahoo.com<mailto:jra_sac at yahoo.com>>, "'equest-users at lists.onebuilding.org'" <equest-users at lists.onebuilding.org<mailto: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<mailto:mmengue at dagherengineering.com>>; 'equest-users at lists.onebuilding.org' <equest-users at lists.onebuilding.org<mailto: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<mailto: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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