Re: [EnergyPlus_Support] No Chilled or Hot water flow through coils.

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

1.  Looking in the err output file, I see many interzone surface errors.  It is 
important to fix these.

2.  Looking in the eio output file, I see that the "Maximum air flow rate" and 
"Max Reheat Water Flow" are sized to zero for all 6 VAV terminal units.

3.  Looking in the idf file, there are sizing objects, but only the outside air 
controller, the vav terminal units, and the plant loop contain an "autosize" 
input.  There are numeric inputs for all other flow rates and capacities.  In 
general, it does not work well to mix and match hard values with auotsized 
values.  As I look at the airflow rates in the branch, air primary loop, fan, 
and coil objects, they do not appear to be consistent.  Note that max flow rate 
is ignored for water branches, so these do not matter.

4.  In the err file . . .

   ** Warning ** The following lines are "Orphan Objects".  These objects are 
in the idf
   **   ~~~   **  file but are never obtained by the simulation and therefore 
are NOT used.
   **   ~~~   **  See InputOutputReference document for more details.
   ************* Object=CONTROLLER LIST=DA-CTRL-EX1

When using a vav terminal unit, there is no need for CONTROLLER:SIMPLE objects 
on the reheat coils.  These are controlled directly by the VAV terminal unit.  
So, I deleted all of the controllers and controller lists related to the reheat 
coils.  Then I noticed that the controllers for the preheat coils were not 
listed in the controller lists, so I added them.

The orphan objects error is gone, but the terminal units are still sizing to 
zero flow.  I cannot explain this, and I will have to forward this to another 
team member to figure out what is wrong.

Mike


On 12 Sep 2007 at 16:35, wenshufan1983 wrote:

> I'm confused that there is no chilled or hot water flow through the
> coils. According to Micheal's email to me, I've checked all these below 
> 1.ZONE CONTROL:THERMOSTATIC to request heating/cooling from the 
> HVAC system.
> 
> 2.The HVAC controls must request flow in the the coil - could be a VAV
> terminal unit with built-in controls for a reheat coil, or a
> CONTROLLER:SIMPLE with a 
> SET POINT MANAGER:*.
> 
> 3.The coils must be ACTIVE components on their branches.
> 
> 4.The loop pump must be scheduled on (or the schedule omitted completely).
> 
> But there is still no flow in the report. Is any one by chance can
> help me out. My IDF file has been upload under Files:Problem
> Submittals:Gil_5.idf. 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.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link 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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