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Re: [EnergyPlus_Support] Warning msg for FCU -- ** Warning ** In calculating the design coil UA for Coil:Cooling:Water 1F:ZONE5 COOLING COIL



Hi Richard,
 
The thing is I am using FCU template, and for Sizing:System I need to input AirLoopHVAC. And for FCU template, I don't actually specify AirLoopHVAC.
 
Any solutions without specifying AirLoopHVAC by using template?
 
Xiaosong ZHANG
 
 
On Fri, Mar 4, 2011 at 10:43 AM, Richard Raustad <RRaustad@xxxxxxxxxxxx> wrote:
 

Try adjusting the temperatures and humidity ratios in the Sizing:System object. Watch how the warning message changes to make sure you are modifying the correct sizing object.



On 3/4/2011 1:12 PM, x z wrote:
 
Hi Group,
 
I am a new user of EnergyPlus, and I am trying to use FCU template by learning from the example: HVACTemplate-5ZoneFanCoil.
 
I copied the HVACTemplate:Zone:FanCoil objects together with Boiler, Chiller template objects to my model. I set the cooling temperature 12.2C and I got warning msg during plant sizing period as below:
 
   ** Warning ** In calculating the design coil UA for Coil:Cooling:Water 1F:ZONE5 COOLING COIL
   **   ~~~   ** no apparatus dew-point can be found for the initial entering and leaving conditions;
   **   ~~~   ** the coil outlet design conditions will be changed to correct the problem.
   **   ~~~   ** The initial design conditions are: Tair,in = 28.0957
   **   ~~~   **                                    Wair,in = 1.690250E-002
   **   ~~~   **                                    Twater,in = 7.2200
   **   ~~~   **                                    Tair,out = 12.2000
   **   ~~~   **                                    Wair,out = 8.000000E-003
   **   ~~~   ** The revised design conditions are: Tair,out = 12.2455
   **   ~~~   **                                    Wair,out = 7.981631E-003
 
I realize this msg is related to my summer design day conditions, and set design day dry bulb temperature will decrese the number of warnings. And It seems that the msg is related to dew-point of my cooling coil, but I can't find place to specify my FCU design dew-point.
 
May I ask, does this relates to my SummerDesignDay conditions setup? How to eliminate this warning msg?
 
Thanks
 
XiaoSong ZHANG

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

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