I have a Core and Shell building where there is an air-to-air heat pump. This HVAC system has the opportunity to do the free cooling in summer season when outdoor air temperatur is lower than indoor air temperature. When free-cooling control is acrivated the outdoor air flow rate is greater than the minimum. Minimum outdoor air flow rate it is used for the baseline model.
So, do I have to model the free-cooling control in the baseline system? Or, how can I model the free cooling control? (climate zone 4a)
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
October 24, 2018 - 11:06 am
This sounds like an economizer system. See Section G3.1.2.6 for the baseline system requirements.
Elizaveta Andreeva
December 17, 2020 - 10:03 am
Mister Sheffer, I have an additional question in this thread. Is it acceptable to simulate free-cooling of living spaces specifically by opening windows when the temperature outside is lower than indoors?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
December 17, 2020 - 1:40 pm
No such manual control is not eligible for savings.
Elizaveta Andreeva
December 17, 2020 - 2:00 pm
Thank you so much for such a quick response!
What if this is not used for savings, but only for modeling in both baseline and proposed case?
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
December 17, 2020 - 2:13 pm
I suppose it is OK if modeled identically and that produces no savings.