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[EnergyPlus_Support] Re: Cycling fans when spaces are unoccupied

Hello,
do you advice to use the object AvailabilityManager:NightCycle ?
For LEED certification can one model the baseline model without air recirculation, if the economizer is not requested?
Regards
Francesco Passerini


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Just because you don't need to be bring OA in at night doesn't mean that 
> you don't need to condition the zones, which means the supply fan must 
> turn on.
> During the day, the fan runs continuously to ensure the proper amount of 
> OA, during the night, if there is a load, the fan turns on and off with 
> the coils.
> 
> There is usually a fan operating mode schedule used with HVAC equipment 
> that can cycle, or you can use a night ventilation manager to cycle the 
> fan on for VAV systems.
> OA control is independent of fan operation (i.e., you can have OA or not 
> if the fan is running).
> 
> On 8/16/2012 10:12 AM, Carolina Galeazzi wrote:
> >
> >
> > Hi All,
> > To build an ASHRAE baseline model, it's said that 'supply and return 
> > fans should be cycled to meet heating and cooling loads during 
> > unoccupied hours'. I understand that fans should run for mechanical 
> > ventilation, but with zero outside airflow rate. How can I cycle the 
> > variable volume fan of the AHUs in Eplus, with zero outside airflow rate?
> > Thank you for your help!!
> > Carol
> >
> >
> >
> >
> > 
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>




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