[EnergyPlus_Support] Autosizing and general E+ procedure

["maenebraska" <maenebraska@xxxxxxxxx>]

I would like to ask a basic question with regard to model creation 
in EnergyPlus.  We have used the "autosizing" function to determine 
several factors for the cooling tower and detailed cooling coil but 
have ended up with a very unstable model.

Is it typical to place autosizing parameters in the unknown 
components in E+, run the appropriate sizing parameters, and replace 
the autosize with the resulting values?  In what cases will 
the "design" paramters (cooling tower W/k, fan flow, cooling coil 
capacitance etc...) not be allow stable operation for all types of 
weather?  

I have been getting errors with regard to unacceptable loop demand 
range causing cooling tower shutdown for various errors and that the 
condenser loop volume is too small for stable operation.  The values 
seeming to cause the errors are the actual values observed in the 
building.

Thank you,

Dan



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