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[EnergyPlus_Support] Re: CheckForRunawayPlantTemps



Hello,

If you set your pump head to 1 Pa the error is gone.

I think the problam is that the energy of the Pump Head is converted in to Heat, thus heating the water loop.

Try using a Manager to turn of the pumps when heating is not needed.

Best Regardes

MN

--- 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:
>  
> **
> Severe  ** Plant temperatures are getting
> far too hot, check controls and relative loads and capacities
>    **   ~~~   **  Environment=SPINIGARDOLO, at Simulation
> time=09/08 08:00 - 08:30
>    **   ~~~   ** PlantLoop Name
> (SupplySide)= HW LOOP
>    **   ~~~   ** PlantLoop Setpoint
> Temperature=14.0 {C}
>    **   ~~~   ** PlantLoop Inlet Node
> (SupplySide) does not have a Setpoint.
>    **   ~~~   ** PlantLoop Inlet Node
> (DemandSide) does not have a Setpoint.
>    **   ~~~   ** PlantLoop Outlet Node
> (SupplySide) has a Setpoint.
>    **   ~~~   ** PlantLoop Outlet Node
> (DemandSide) does not have a Setpoint.
>    **   ~~~   ** 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
>  
> 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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