[EnergyPlus_Support] Autosizing of heating coil UA failed

["iluminasol33@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Dear forum,

I have a severe error in my model and I am not able to find the problem. Here is the error:

  ** Severe  ** Autosizing of heating coil UA failed for Coil:Heating:Water "name of zone" FAN COIL UNIT HEATING COIL

 **   ~~~   **   Bad starting values for UA

   **   ~~~   **   Lower UA estimate = 351.326817 W/m2-K (0.1% of Design Coil Load)

   **   ~~~   **   Upper UA estimate = 351326.817985 W/m2-K (100% of Design Coil Load)

   **   ~~~   **   Zone "N00MB:PHYSCLMDCNAHU27" coil sizing conditions (may be different than Sizing inputs):

   **   ~~~   **   Coil inlet air temperature     = 98.627 C

   **   ~~~   **   Coil inlet air humidity ratio  = 3.974E-003 kgWater/kgDryAir

   **   ~~~   **   Coil inlet air mass flow rate  = 20.768964 kg/s

   **   ~~~   **   Design Coil Capacity           = -373993.539 W

   **   ~~~   **   Design Coil Load               = 351326.817 W

   **   ~~~   **   Inadequate water side capacity: in Plant Sizing for this hot water loop

   **   ~~~   **   increase design loop exit temperature and/or decrease design loop delta T

   **   ~~~   **   Plant Sizing object = HW LOOP

   **   ~~~   **   Plant design loop exit temperature = 80.000 C

   **   ~~~   **   Plant design loop delta T          = 10.000 C

   **  Fatal  ** Preceding water coil sizing errors cause program termination

I am modeling an HVAC system that uses the zoneHVAC:FourPipeFanCoil object, connected to an air cooled chiller. I have several zones connected and only one of them has this severe error, and I have checked the IDF file and have not found any inconsistency in the corresponding data of this particular zone. 

Any help would be greatly appreciated,

Regards,

Santiago

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Posted by: iluminasol33@xxxxxxxxx

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