We are modeling a building that is separated into three different spaces. These spaces have differing functions, schedules and systems. There is an office, manufacturing area, and warehouse storage.

These 3 spaces combine to over 200,000 square foot, which would make our baseline system a chilled water system. However, it would behoove the project if we could separate out the 3 differing spaces and build a baseline system for each space to compare to. This would put each 'space' in the baseline building under 200,000 square foot and thus allow us to compare our proposed building model to 3 separate systems conditioned by System 3 or 4.

Since each oif these spaces is a minimum of 40,000+ square foot, can we use exception A in G3.1.1? Therefore the baseline and proposed buildings would each have 3 separate systems? If not, could we at least use exception B making them single zone constant volume systems?

Any help would be appreciated greatly. Thanks in advance.