[Equest-users] ASHRAE 90.1 baseline HVAC system interpretation

[Chris Jones via Equest-users]

My usual interpretation in this type of situation is that the café will have occupants when the gym is unoccupied and I apply the exception – one system for the Gym and one system for the café.


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Christopher Jones, P.Eng. | Senior Energy Analyst
RWDI
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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 11:54 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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