[EnergyPlus_Support] Humidity Issues

["noelcrrl" <noelcrrl@xxxxxxxxx>]

Dear All-

We are modeling a school building in the humid climate of Houston.  
Our HVAC system consists of constant volume rooftop units that have 
2 DX cooling coils (2 cooling coils are necessary in EnergyPlus to 
achieve 55F air temperature after the cooling coil) and a gas 
heating coil.  The system does not have any reheat coils or 
perimeter units.  With this system we have had a problem controlling 
the humidity in the zones.

The zone air relative humidity routinely exceeds 50% during the full 
weather file simulation even though the air temperature after the 
cooling coil remains relatively constant at 55F.  In addition, it 
seems that the wet bulb temperature increases from the end node of 
the cooling coil (1E DX Outlet) to the air loop outlet node (1E Air 
Loop Outlet).  What is causing this rise in wet bulb temperature?  

The idf file has been posted and is named C1C_1.idf.  Thank you for 
your help.

Noel Corral




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.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/