[Equest-users] ASHRAE 90.1 baseline HVAC system interpretation

[Nicholas Caton via Equest-users]

The simplest approach (in the interest of your own time) may be to define for the cafeteria/gym a “combined” system schedule that ensures the operating hours and ventilation delivery is satisfied for both areas.

Otherwise, I think you should be able to safely interpret G3.1.1.b exceptions when the occupancy/process loads/schedules differ significantly from the rest of the same floor.  That isn’t the exact wording in 90.1, but if I were your reviewer I think this fits the spirit / intent for such exceptions.  Worst case scenario is your reviewer disagrees, and you’re later pushed into the first suggestion to combine those cases, resulting in a larger baseline system with broadly worse unitary efficiencies, helping your performance rating if anything.

~Nick

[cid:image001.png at 01D2579E.120B85C0]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
M  785.410.3317
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>
F  913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

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From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Beran Gurtekin Celik via Equest-users
Sent: Friday, December 16, 2016 10:54 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] ASHRAE 90.1 baseline HVAC system interpretation


Hi all,

I am puzzled with the interpretation of Ashrae 90.1-2007 G3.1.1 where is says each floor shall be modeled with a separate HVAC system.

My proposed building is a 4 story office building with 3 floors office and a first floor consisted of cafeteria, kitchen and gym. Office floors have one system per floor and the first floor has three systems for each specific area. My baseline is using system 6 for the typical office floors. I am trying to interpret the G3.1.1 for the first floor. If I combine all those areas into one system their occupancy schedules, HVAC schedules, OA rates etc are all different and if I use one system, the schedules will not match the proposed. The kitchen qualifies for exception b due to thermal loads, so I will use a single zone system for that area. I am wondering how I should approach the gym and cafeteria. Can I use two systems in the baseline for those areas? They do not fall into exception b since their schedules and loads do not differ significantly from other spaces (office spaces) but they do differ from each other and using one system for those two different usage areas brings the dilemma of using a different schedule from the proposed building.

Any insights will be greatly appreciated.

Regards,
Beran






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