Re: [EnergyPlus_Support] Cooling & Heating Design Air Flow Method

["Michael J. Witte" <mjwitte@xxxxxxxx>]

If you specify a volumetric airflow rate in the zone sizing object, 
then this overrides the design load calculation for that zone.  The 
specified rate is then used when sizing the central air handling 
components (fan, coil, etc.)  This does not override the specified 
supply air temperature for sizing.  Supply air volumes are sized to 
meet the sensible load in the zone based on the design day 
simulations.  For hourly details of these loads, see the *.zsz and 
*.ssz output files.

Mike



On 7 May 2003, at 14:32, Ruchi Choudhary wrote:

> 
> Dear All,
> 
> In the Zone Sizing Object there are two fields that allow the user to
> either specify the volumetric airflow rate, or compute it on the basis
> of the design day simulation.
> 
> My understanding is that the mass flow rates computed by the zone
> sizing object are used in conjunction with the system supply
> temperature and outside air flow rate to compute the system capacity.
> 
> So if I specify the volumetric airflow rate for a zone, will it be
> used to determine the system capacity rather than the output from
> design day simulation? By doing so, I am implicitly also over-riding
> the design load computed by the zone-sizing object and zone supply air
> temperature specification?
> 
> Also, the *.eio file lists the design volumetric air flow rates for
> each zone. I am assuming these are computed on the basis of the design
> load and zone-sizing specs. (supply temperature and humidity)?
> 
> ruchi.
> 
> 
> 
> 
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