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CS-2009 EAc1:Optimize Energy Performance

Modelling free cooling

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) 

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Wed, 10/24/2018 - 15:06

This sounds like an economizer system. See Section G3.1.2.6 for the baseline system requirements.

Thu, 12/17/2020 - 15:03

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?

Thu, 12/17/2020 - 18:40

No such manual control is not eligible for savings.

Thu, 12/17/2020 - 19:00

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? 

Thu, 12/17/2020 - 19:13

I suppose it is OK if modeled identically and that produces no savings.

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