I have a a single story building that requires a Baseline system 6 (per table G3.1.1A), which according to G3.1.1 is modeled on a floor by floor basis - So I have 1 system. Within this, I have an unfinished fallow space @ 480sqm. Following G3.1.8, G3.1.10(c) and G3.1.10(d) as no heating and cooling system exists, the heating and cooling system in the baseline and proposed case should be the same.
In selecting this system, should I use a new and separate System 6 (as the overall building type meets this definition) for both proposed and baseline models or should I use a System 4? (as this specific thermal block is less than 2300sqm per table G3.1.1A) and similar single zone exceptions dictate the use of System 4 (e.g. G3.1.1 Exception b)
Thanks in advance.
Graham
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
June 26, 2018 - 10:03 am
The application of an exception to G3.1.1 would depend upon the intended future use of the space. If it is intended to be finished with a similar function to the rest of the building then an exception probably does not apply. So you first needt o determine if an exception applies to this space. If not then you would model a separate System 6 for that space in the proposed model and have a single system 6 in the baseline model.
Alessandro Zuanon
Energy Consultant & Modeler1 thumbs up
January 23, 2020 - 9:11 am
Let's suppose that i have a similar case, but Baseline case has System 8.
In Proposed building I have an unfinished space at ground floor, presenting similar function to the rest of the building, so no exceptions.
The design documentation provides ducts, pipes and terminals also in that specific space (designed, but not finished).
Is it correct and possible to model a System 8 only for that specific space? Is there any other possibility?
For example, could i follow the design documentation for that space?
Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
January 23, 2020 - 1:06 pm
If the space is designed but unfinished you can model the proposed as designed and the baseline as a system 8. You need to model as system 8 with one system per floor (see G3.1.1).