Re: [EnergyPlus_Support] Re: Zone Sizing output file

[Fred Buhl <wfbuhl@xxxxxxx>]

We'll modify the Zsz.csv file to include the units for "peak vol flow". 
The air density is
for dry air at 20 degrees C, pressure = 
101.325*(1-2.25577E-05*Elevation)**5.2559;
this is an elevation corrected standard pressure formula from the ASHRAE 
Handbook of
Fundamentals.

Fred Buhl

JV Dirkes II wrote:
> That is very helpful and now makes sense! At what temperature and
> pressure is the volumetric flow rate calculated?  I get slightly
> different values using STP conditions.  How about documenting this and
> modifying the .csv file to add the units in the description? 
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Fred Buhl <wfbuhl@...> wrote:
>   
>> The "peak" value is the maximum of the individual timestep mass flow 
>> rates. It is in kg/s, as are
>> the timestep numbers. The "Peak Vol Flow" is the peak converted to 
>> volumetric flow rate: its
>> units are m3/s.
>>
>> Fred Buhl
>>
>> jvd2pe wrote:
>>     
>>> When running a design-day-only simulation for the purpose of checking
>>> zone sizing, the *****cZsz.csv file has the last two lines labelled
>>> "Peak" and "Peak Vol Flow".  For the mass flow rate columns, these
>>> values differ, and the "Peak Vol Flow" value is always less than the
>>> "Peak".  What is the definition for these two values? (p.s., I have
>>> NOT assigned a  value for the "heating max air flow".)
>>> Thanks in advance!
>>>
>>>
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