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RE: [EnergyPlus_Support] - Uploaded Dual Duct file

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: RE: [EnergyPlus_Support] - Uploaded Dual Duct file
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Thu, 11 Sep 2003 12:03:41 -0500
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My apologies for the dealayed response.  SET POINT MANAGER:SINGLE 
ZONE MIN HUM is used to control a humidifier for a single zone.  ZONE 
CONTROL:HUMIDISTAT is used to control unitary equipment for 
dehumidification.  These are both single-zone objects.  There is no 
multiple-zone humidity control currently available.

Mike


On 9 Sep 2003, at 17:27, Samuel Roose wrote:

> Thanks, Mike. With regards to the set point managers, I am now unsure
> as to how to connect the humidifier up to multiple zones. On
> relection, the "maximum iterations exceeded" file could be caused by
> the air loop outlet node being referenced so often. I figured
> referring the zones to the same node would in a sense create a
> splitter for humidification. Is there an example file available where
> more than one zone is served by a humidifier? Can the humidifier serve
> the zones without a set point manager? After all, there is already a
> setpoint outlined in the "Humidistat" object. Thanks in advance,
> 
> Sam Roose    
> 
>  -----Original Message----- 
>  From: Michael J. Witte [mailto:mjwitte@xxxxxxxx] 
>  Sent: Tue 9/09/2003 5:20 a.m. 
>  To: EnergyPlus_Support@xxxxxxxxxxxxxxx 
>  Cc: 
>  Subject: RE: [EnergyPlus_Support] - Uploaded Dual Duct file
> 
> 
>  A dual duct system needs two air branches, each with an exit node.  
>  These exit nodes are listed in a node list which is specified as the 
>  "AirLoop Outlet Nodes" list in the AIR PRIMARY LOOP object.  These 
>  nodes, and the order in which they are listed, must correspond with 
>  the nodes in the "SupplyAirPath ZoneEquipGroup Inlet Nodes" list.
> 
>  I only see one air branch in your simulation.  You need a branch for 
>  the hot side and a branch for the cold side.  See one of the dual 
>  duct examples, such as
> 
>  \EnergyPlus\ExampleFiles\Misc\DualDuctVarVolDamper.idf
> 
>  Also, I see many set point managers all acting on the same node (Air 
>  Loop Outlet Node).  This will not work as you expect.  Each setpoint 
>  manager will overwrite the value placed on the setpoint node, so only
>  the last one in the list will actually control the node.
> 
>  Mike
> 
> 
>  On 7 Sep 2003, at 16:09, Samuel Roose wrote:
> 
>  > I have two issues with a file I have just uploaded (dualduct.idf).
>  One > is that I am trying to run the dual duct system and maintain
>  the air > loop - I get this error message: > >    ** Severe  ** Air
>  System:number of air system exit nodes must match >    number of zone
>  equip inlet nodes ** Severe  ** Branch for Air >    System=TYPICAL
>  TERMINAL REHEAT 1, has an error. **   ~~~   ** >    Probable missing
>  or misspelled node referenced in the branch(es): >    **   ~~~   **
>  Possible Error in Branch Object=AIR LOOP MAIN BRANCH >    **  Fatal 
>  ** Errors found getting Air Primary Loop > > It is not clear to me
>  which nodes to put where for this one. > > The other issue is that I
>  am trying to gain energy consumption data > for the two gas boilers
>  in the file. I have put a "Gas: Facility" > meter in, but this does
>  not register any values in the output. The hot > water loop demand
>  results also seems to be cumulative. Is there an > output which can
>  give me the gas consumption per hour for these > boilers, or are the
>  boilers in the file not functioning for some > reason? > > Thanks in
>  advance, > > Sam Roose > Victoria University of Wellington > >
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> 
> 
>  ========================================================
>  Michael J. Witte, GARD Analytics, Inc.
>  EnergyPlus Testing and Support      
>  EnergyPlus-Support@xxxxxxxx
> 
> 
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References:
- RE: [EnergyPlus_Support] - Uploaded Dual Duct file
  - From: Samuel Roose

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