Re: [EnergyPlus_Support] Cooling coil error

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

Reviewing the eio output file component sizing results, shows the following for 
the first chilled water coil:

 Component Sizing, COIL:Water:Cooling, ZONE 1 COOLING COIL, Design Air Outlet 
Temperature [C],   13.000    
 Component Sizing, COIL:Water:Cooling, ZONE 1 COOLING COIL, Design Water Inlet 
Temperature [C],   12.000    

These values are too close.  Even though this is specified as a counterflow 
coil, the delta T should be greater.  I am not a chilled water coil expert, but 
I would expect to see at least 3 or 4 deg. C difference here.

Change the "Design loop exit temperature" (the chilled water supply 
temperature) in the PLANT SIZING object for the chilled water loop.  I changed 
this to 7C and the coil sizing errors went away.

We will try to make this particular error message more meaningful as well.

Mike


On 27 Mar 2006 at 19:23, Sam Roose wrote:

> Thank you for your suggestion about the system sizing with regards top the
> file "7_MANAGER_CHANGES". Unfortunately, another error has popped up,
> despite the cooling setpoint now being met. I have sent a file called
> "11_MORE_AUTOSIZING" into the problem submittals folder, containing the
> error: 
> 
> ** Warning ** For COIL:Water:Cooling ZONE 20 COOLING COIL
> **   ~~~   ** CalcCoilUAbyEffectNTU:Given Q impossible for given inlet
> states,Proceeding With MaxHeat Transfer
> 
> I don't have any idea what this means really. The same error seems to occur
> for all coils that are in big zones. Most of this file is autosized so I am
> thinking the autosize inputs are still not quite right. The heating setpoint
> is not being met at the moment. Any help on this error is much appreciated.
> 
> The file should be in Version 1.2.3 now.
> 
> 
> --
> 
> Sam Roose
> Energy Analyst 
> Energy Solutions Ltd.
> PO Box 12558, Wellington
> Phone: 971 8261   Fax: 971 8231    Mobile: 021 150 5236
> 
> 
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> http://www.energyplus.gov
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> http://groups.yahoo.com/group/EnergyPlus_Support/
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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