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[EnergyPlus_Support] Re: Infiltration Schedule in the Reference Building, Large Office Chicago Example

Homero and Jason,

Yes, infiltration scheduled with a factor of 1.0 during HVAC system off hours, and a lower factor during HVAC system on hours, is what is intended for the reference building models.

However, multizone airflow simulations performed in CONTAM here at NIST shows that infiltration rates in some buildings are similar, whether system on or off. The report can be found here: http://www.bfrl.nist.gov/IAQanalysis/case%20studies/cwcase_12.htm

Nevertheless, research is ongoing for selecting an appropriate building air leakage value and how to account for weather effects on infiltration in energy modeling. Currently, infiltration is scheduled as constant values in the reference building, which as the referenced report shows, significantly impacts predicted energy use.

Lisa
lisa.ng@xxxxxxxx

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jason Kirkpatrick <jason.alan.kirkpatrick@...> wrote:
>
> Homero,
> 
> This is pretty standard practice for infiltration:
> 
> when the HVAC systems are on, they are designed to bring in about 10% more
> outdoor air than they exhaust, and therefore the building is positively
> pressurized relative to the outdoors, thus reducing infiltration air-flows
> during HVAC system operation. There is a good document describing the
> modeling of infiltration specific to energyplus by PNNL and located here:
> 
> http://ibpsa-boston.com/minutes/IBPSAboston-presentations_2011-09-16_Gowri.pdf
> 
> Jason
>




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