On 07.10.2014, at 22:58, "iluminasol33@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
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: "jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>
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