Re: [EnergyPlus_Support] An error when applied the UCSD Displacement Ventilation Module

[Zhen Tian <tianzhen9@xxxxxxxxx>]

Thanks, Mike.

Actually this error only appears when I add the UCSD DV module into the zones. There is no problem when I use the UCSD UFAD module or use conventional mixing module.

I tried to delete the RoomAir Model for the zone with errors. Then, another zone appears the same error and causes the simulation to crash.

Thanks.

Regards,

David



"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:                               It is difficult to say without more information.  My guess is that there is 
 something wrong with the ventilation inputs and the zone is overheating from 
 solar or internal gains.  Did the simulation progress far enough to report any 
 output?  Perhaps you can report zone air and surface temperatures and determine 
 more about the problem.
 
 Mike
 
 On 29 Jan 2008 at 13:12, Zhen Tian wrote:
 
 > Dear all,
 > 
 > I modeled one floor of a building with displacement ventilation builidng. I used
 > the UCSD Displacement ventilation module in my simulaiton model. Then I got the 
 > following warnings and error.
 > 
 > "Warning ** Calculated Relative Humidity out of range (PsyRhFnTdbWPb)
 >    **   ~~~   **  Occurrence info=CALGARY INT'L AB CAN WYEC2-B-25110
 >    WMO#=718770, 01/02 05:00 - 05:10 **   ~~~   **  Dry-Bulb= -333.04 Humidity
 >    Ratio= 1.000E-005 Calculated Relative Humidity (fraction)= 844.67 **   ~~~  
 >    ** Relative Humidity being reset to 1.0
 > ...
 > 
 > Severe  ** Temperature out of bounds (219.18) for surface=SUBOBJ:0468
 >    **   ~~~   ** in Zone=Z106
 >    **   ~~~   **  Occurrence info=CALGARY INT'L AB CAN WYEC2-B-25110
 >    WMO#=718770, 01/02 05:05 - 05:06 **   ~~~   ** A temperature out of bounds
 >    problem can be caused by several things.  The user **   ~~~   ** should check
 >    the weather environment, the level of internal gains with respect **   ~~~  
 >    ** to the zone, and the thermal properties of their materials among other
 >    things. **   ~~~   ** A common cause is a building with no thermal mass --
 >    all materials with **   ~~~   ** Regular-R definitions."
 > 
 > But I did not use reguar-r for building materials and construciton. In addition,
 > the model without the UCSD DV module has not problem.
 > 
 > Does someone has the same experiences before and can tell me how to resolve this
 > issue?
 > 
 > Thanks a lot in advance.
 > 
 > Regards,
 > 
 > David
 > 
 > 
 > 
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 ========================================================
 Michael J. Witte, GARD Analytics, Inc.
 EnergyPlus Testing and Support      
 EnergyPlus-Support@xxxxxxxx
 
 
     
                               

       
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