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RunawayPlantTemps Failure
 
  
 
  
 
 
 
 
 
 
    
        
        asked 9 years ago  
 
 elvin's avatar  
 
 
 
 
    
        
        updated 3 years ago  
 
 Aaron Boranian's avatar  
 
 
 
 
 
Hello,
My model has water to air heat pump mostly for cooling and single duct terminal units provide heating to each zone. Somehow I'm getting failure after 2hr 10 min as "CheckForRunawayTemps: Simulation terminated because of run away plant temperatures, too hot. Does anyone have a similar experience?
 
Thank you
Elvin
 
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Which simulation tool are you using? Please add the tag for it in the question so others can help you better
Aaron Boranian's avatar
                        Aaron Boranian
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        9 years ago
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        answered 9 years ago  
 
 Aaron Boranian's avatar  
 
 
 
 
 
Without looking at your model, it seems that there are two possibilities:
 
     
  • You do not have a bypass branch on the supply and demand side of your plant. These still allow flow to occur in the plant, but avoid components like heat pumps and coils that will exchange heat with the fluid when it's not desirable.
    •  
  • You have a pump that is operating all the time. Efficiency losses in pumps translate to some heating transferred to the fluid. Whether you're using a constant or variable speed pump, make sure that the Pump Control Type input field is set to "Intermittent" and not "Continuous". 
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        Asked:  9 years ago  
 
 
        Seen: 306 times 
 

        Last updated: Apr 04 '16 
 
 
 
 
 
 
 
 
 
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