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[EnergyPlus_Support] RE: WaterToWater HeatPump?

The first thing to be noted is that the heat pump component does not have the autosize capability. In your input file you have the plant loop maximum flow rate specified as Autosize. Plant loop calculates its flow rate using the formula for stability explained in Engineering documentation. So when you specify the plant loop as autosize and then a component with some flow rate, it is not necessary that the loop flow rates be consistent. This inconsistency is causing the errors, which is basically violation of continuity in the loop. I recommend that you change the plant loop maximum flow rate to the heat pump design flow rate. Again since you are using a constant flow pump, it is agian recommended that the specified flow rate of the pump match the component design flow rate. If you have more than one components in the loop which are parallel, then add the design flow rates and select a pump with a nominal flow rate equal to the sum. These changes will remove the errors and run
  the simulation.
  I'm now simulating a WaterToWater Heatpump system.There is a severe 
while running the Ep-Lanch:

** Severe  ** Inlet parameters for plant demand side splitter are not 
physically possible
   **   ~~~   ** Problem in input for plant demand side CHILLED WATER 
   **   ~~~   ** The maximum flow out of the splitter is less than 
the minimum inlet flow
   **   ~~~   ** Flow rate inputs for the loop do not match flow 
requirements of the various branches/components
   **   ~~~   ** Check your flow rates and make sure that flow 
balances between the splitter inlet and outlets
   **  Fatal  ** EnergyPlus terminated due to reason stated above

  I've uploaded the .idf named WaterToWater HeatPump.

  Thanks in advance.

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