Re: [EnergyPlus_Support] possible error for ACH calculation

[Frederick Winkelmann <FCWinkelmann@xxxxxxx>]

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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