Re: [EnergyPlus_Support] calculation of indoor humidity

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

The uploaded files do not have the same design days in them.  This will affect 
the equipment sizing and the latent removal.  Perhaps you just uploaded a wrong 
file?  In both runs, check to be sure that the drybulb temperature in the zone 
is meeting setpoint.  If you still cannot make sense of the results, please 
upload revised files.

Mike


On 26 Jul 2004, at 1:02, zhaicq98 wrote:

> I have a question about the indoor humidity. I try to evaluate the 
> the performance of an energy recovery ventilator (I use air-to-air 
> exchanger model in EnergyPlus). My base case is a single-zone 
> building with a constant air volume system. The alternative case is 
> the same building, same HVAC system, but I add the ERV on top of it. 
> When I look at the resulting indoor conditions, I find that the 
> indoor RH for the base case is about 40-50% most of the time, which I 
> think is reasonable. But the indoor RH for the alternative case is 
> very low, always below 40%, even when the ERV is not running 
> (accordint to its available schedule). I am surprised about the 
> results. Can anyone help me with it? 
> 
> I have uploaded two files to the "Files" area, one named as CAV.idf 
> and another named as ERV.idf. I run the simulation for Pittsburgh. I 
> got warning messages about the psychrometric chart. I am not sure if 
> it is the reason for the problem.
> 
> Thanks
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx



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