My project consists of the following types of spaces:
1. Office: 2,300 SF
2. Manufacturing / laboratory: 24,055 SF
3. Warehouse: 26,905 SF
4. Shell space for future fitout: 42,227 SF
Total: 95,487 SF
The capacity for the fitout space has been built into the chilled water and hot water systems, but there are no air handling units installed for this space at this time, only temporary heating and cooling via 4-pipe fan coil units. Since this is the largest area type by square footage, I’m not sure what baseline system type to use? For the remainder of the building, I’m assuming I would use System 5, Packaged VAV with reheat as the baseline. Is it possible to exclude this future fitout space from the energy model altogether since it does not have the final air system installed?
Additionally, there is one air system that serves a manufacturing / laboratory space that is an ISO-8 clean room. It has to maintain 20 air changes/hour. Therefore, the system is constant volume, and has no economizer (so as to avoid clogging the HEPA filter too quickly). Is there any exception for this type of space, or do I still have to use System 5, Packaged VAV w/ reheat as baseline to compare to?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
October 18, 2012 - 9:48 am
You can't exclude the fitout space and it must be modeled as fully occupied. If you do not know what type of use will occur the default is office space.
I am not sure I can answer your question directly. Here is how you go about it however. Identify the predominant condition (see note under Table G3.1.1A). Enter this table with the square footage of that space type. Then go to G3.1.1 b, c, and d to determine which exceptions may apply to each space type and follow the direction there.
Kari Krolikowski
Mechanical EngineerSNC Lavalin
1 thumbs up
October 18, 2012 - 10:38 am
Just to clarify about the fitout space, we do not know what the future use will be, so I will use default office space. When modeling this, do I follow G1.3 and model everything the same for both proposed and baseline, except the envelope, which is already there?
OR
Since we have chilled water available and we know the future air handling units will be chilled water VAV, can I model this for the proposed and use efficient lighting loads we are using for office space in other parts of the building?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
October 18, 2012 - 11:20 am
For the fit out space follow Table G3.1-10. If the systems have not been designed then the spaces are modeled identically to the baseline.
You can only claim savings for these spaces if the HVAC or lighting systems have been designed and/or there is a binding requirement for the more efficient system to be installed.
Kari Krolikowski
Mechanical EngineerSNC Lavalin
1 thumbs up
October 18, 2012 - 11:32 am
The systems have not been designed. However, would a letter signed by the client on company letterhead, stating that it is building policy that any future HVAC systems be chilled water qualify as a binding requirement?
Thank you so much for all your help with this!
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
October 18, 2012 - 11:49 am
Yes that makes sense.