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[EnergyPlus_Support] Re: CheckForRunawayPlantTemps
Do you have a bypass in your designbuilder model?
there exists a specific output variable for the bypass. to get a list of all the possible output variables for your simulation you have to include "Output:VariableDictionary,IDF;". this produces a .rdd text file list. look for the bypass variable and copy paste that output also into your idf to output.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, direzionecontraria <direzionecontraria@...> wrote:
>
> Hello.
> I am
> a beginner in using EnergyPlus. I created a model in DesignBuilder and I
> exported the .idf file in EnergyPlus. I attach the file.
> I have
> the following error:
> Â
> **
> Severe ** Plant temperatures are getting
> far too hot, check controls and relative loads and capacities
> Â Â **Â Â ~~~Â Â **Â Environment=SPINIGARDOLO, at Simulation
> time=09/08 08:00 - 08:30
> Â Â **Â Â ~~~Â Â ** PlantLoop Name
> (SupplySide)= HW LOOP
> Â Â **Â Â ~~~Â Â ** PlantLoop Setpoint
> Temperature=14.0 {C}
> Â Â **Â Â ~~~Â Â ** PlantLoop Inlet Node
> (SupplySide) does not have a Setpoint.
> Â Â **Â Â ~~~Â Â ** PlantLoop Inlet Node
> (DemandSide) does not have a Setpoint.
> Â Â **Â Â ~~~Â Â ** PlantLoop Outlet Node
> (SupplySide) has a Setpoint.
> Â Â **Â Â ~~~Â Â ** PlantLoop Outlet Node
> (DemandSide) does not have a Setpoint.
> Â Â **Â Â ~~~Â Â ** PlantLoop Outlet Node
> (SupplySide) "HW LOOP SUPPLY SIDE OUTLET" has temperature=299.9 {C}
>   **  ~~~  ** PlantLoop Inlet Node (SupplySide) "HW LOOP SUPPLY
> SIDE INLET" has temperature=299.9 {C}
> (..)
> ** Fatal ** CheckForRunawayPlantTemps: Simulation terminated because of run away
> plant temperatures, too hot
> Â
> I
> think that finding an overheating within the HW LOOP in September is
> strange, because in that period the HW
> LOOP should not work (see PlantEquipmentOperationSchemes: as â??Control Scheme 1
> Scheduleâ?? I imposed â??winterâ??, which is on only during the winter season).
> During the summer season I imposed a low PlantLoop Setpoint Temperature (14.0 °C)
> because the HW system should not work. Is it sensible?
> I tried to solve the error changing the schedule in â??SetpointManager:Scheduledâ?? (s.
> â??winter65â??), but without success.
> In the discussion
> http://tech.groups.yahoo.com/group/EnergyPlus_Support/message/24203
> I read about a similar problem in another model.
> In that case the problem was the HeaderedPumps object, but in my model there
> isnâ??t any HeaderedPumps object.
> As that discussion suggested, I added
> Output:Variable,HW Loop Demand Side Bypass Pipe
> Inlet Node,System Node Temp
> but with that object the simulation crashed
> without providing fatal error message.
> In the HVAC loop in correspondence of the boiler
> there is a bypass. How can I determine how much water flow flows through the
> bypass?
> Thank
> you for your attention!
> Best
> Regards
> Francesco
> Passerini
>
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