Re: [EnergyPlus_Support] possible error for ACH calculation

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

FYI - The fix for this problem has been done and will become 
available in the next release.

On 20 Oct 2003, at 13:59, Frederick Winkelmann wrote:

> Ian,
> 
> You are right. There is a bug in EnergyPlus. The timestep values of
> "Infiltration-Air Change Rate" are OK. But for hourly reporting the
> sum of the timestep values is being used instead of the average. I'll
> fix this.
> 
> Thanks for finding the problem!
> 
> Fred Winkelmann
> 
> 
> idoebber wrote:
> 
> > When I use COMIS and obtain the infiltration volume (m3) and ACH for
> > each zone, I checked to see if the ACH was the same as dividing the
> > volume output by each zone's volume.  My output time step is in
> > hours so I figured the volume outputed represented all the exterior
> > air that entered the zone during that hour.  What I discovered was
> > that my own calculated ACH was exactly 6 times smaller then Energy
> > Plus's ACH.  I figured it had something to do with my HVAC timesteps
> > per hour being 6.  Is there an error with Energy Plus's ACH or am I
> > going about this the wrong way.
> >
> > Thanks
> > Ian
> >
> >
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