Re: [EnergyPlus_Support] Autosizing problem with reheat coils

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

For some reason the file is not showing in the yahoo group.  From your message, 
I am guessing that the ZONE SIZING "Zone heating design supply air temperature" 
and the SYSTEM SIZING "Central heating design supply air temperature" are both 
35C.  If this is the case, then the reheat coil has a zero delta T across it.  
The SYSTEM SIZING "Central heating design supply air temperature" should be 16C 
for this case.

Mike


On 27 Mar 2006 at 12:47, Elmer Morrissey wrote:

> Hello all,
> 
> I am having a lot of difficulty with an autosizing problem. I have a
> relatively simple system that takes 100% FA which is heated to 16C by
> a heating coil in the main AHU. However, the reheat coils are meant to
> provide the remaining heat for the supply air. I would like everything
> to be autosized.
> 
> The errors look like this...
> 
>    ** Warning ** The design coil load is zero for
> COIL:Water:SimpleHeating RH:1
>    **   ~~~   ** The autosize value for max water flow rate is zero
>    **   ~~~   ** To change this, input a value for UA, change the
> heating design day, or lower
>    **   ~~~   **   the system heating design supply air temperature
> 
> However, I am happy with the design day and I do not want to lower the
> system heating design supply air temperature any lower than 35C. Is it
> possible to autosize both the UA and the flowrate?
> 
> I really appreciate it. I've uploaded the problem to the problem
> submittals area with the file name... warmair.zip. 
> 
> Kind regards
> 
> -Elmer Morrissey
> 
> 
> 
> 
> 
> 
> 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
> 
> 
> 
>  
> 
> 
> 
> 


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





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