System 7 - Constant Volume - 24/7 spaces

Victoria Watson

AECOM

LEEDuser Basic Member

4 thumbs up

June 25, 2014

Hi, I am classifying my 24/7 elec/comms rooms under G3.1.1 Exception b and therefore modeling them with System 3 - Constant volume packaged roof top air conditioner. My question is as these spaces aren't really occupied but are 24/7, should the system a) be constant volume 24/7 and vary the temperature to meet the load in the space or b) cycle on/off to meet the load in the space. Thanks

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Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Wed, 06/25/2014 - 15:01

Cycle on and off to meet the load.

Victoria Watson

AECOM

LEEDuser Basic Member

4 thumbs up

Tue, 11/04/2014 - 01:52

Thanks Marcus, If you were using System 3 for spaces with different occupancy (E.g if the building is 9-5 but there are some 24/7 spaces) that had ventilation requirements then in order to provide the ventilation I think the whole system would need to be on at peak supply 24/7 (as constant volume) and vary the temperature to meet the conditions. Does this sound correct, seems like this could be an energy hog in the baseline in some occurrences. Thanks

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 11/04/2014 - 14:54

You are required to apply exceptions. So within a system 3 if there is a space with a significantly different schedule it would be a separate system 3.