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CS-2009 EAp2:Minimum Energy Performance

Baseline System for Warehouse Shell

Wondering how to determine the baseline system for a warehouse that upon initial completion will be a cold, dark shell maintained at 50°F. For EAp2 we are assuming 10% office space for the future tenants and use of PSZ-AC units for those spaces. The remaining 90% is assumed to be warehouse space that will be only heated to maintain 50-60°F. How do I apply the system mapping of Table G3.1.1A to this building? Since the building is 200,000 SF and utilizes fossil fuels for heating, the table indicates System 7 – VAV with reheat. So would I apply that baseline system to the entire building or just the office spaces? If just to the office spaces, what would I use for the warehouse? The proposed model will have make-up air units and unit heaters in the warehouse. Would appreciate input anyone may have. Thanks,

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Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
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Tue, 08/14/2012 - 22:35

Sounds like the predominant condition (see note under Table G3.1.1A) is the warehouse. It does not really matter what happens on initial completion in a CS project. All the spaces are modeled as if fully occupied. If you do not know the occupancy you will need to ask the owner what the space is intended for and model that based on assumptions found in the energy modeling appendix for CS projects in the Reference Guide. If the systems are not designed then they are modeled the same as the baseline in the proposed. If they are designed then the proposed is modeled as designed. Of use in selecting your baseline system will be the exceptions to G3.1.1 which allow a secondary system for the office area. The warehouse itself may qualify as a system #9 or #10 from ASHRAE 90.1-2010 if the space is heating only.

Wed, 08/15/2012 - 17:31

Thanks Marcus. I appreciate the input. I think you’re right that system 9 from ASHRAE 90.1-2010 would be appropriate to use here. The only HVAC system that will be designed as part of the C&S scope is the gas unit heater system which will heat the entire building upon initial completion and only the warehouses once the tenants are built out. It makes a lot more sense to compare this to system 9 than to system 7. So that covers comparison of the designed elements to the baseline as determined by 90.1. For the offices I will use system 4 - PSZ-HP for both the proposed and baseline models since those systems are not yet designed. This approach makes the most sense to me since it allows documentation of energy savings for the designed system (if any), and leaves the undesigned area neutral. Thanks for all your help!

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