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
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
June 25, 2014 - 11:01 am
Cycle on and off to meet the load.
Victoria Watson
AECOM4 thumbs up
November 3, 2014 - 8:52 pm
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 Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 4, 2014 - 9:54 am
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.