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GoogleCodeExporter avatar GoogleCodeExporter commented on August 22, 2024
The issue was that the PTAC in the model had a cfm/ton that was “out of 
range” as per EnergyPlus calculations. The following are the details of the 
error from the log file:
1: Sizing: Coil:Cooling:DX:SingleSpeed "COILCOOLING 1": Rated air volume flow 
rate per watt of rated total cooling capacity is out of range.
Min Rated Vol Flow Per Watt=[4.027E-005], Rated Vol Flow Per Watt=[3.001E-005], 
Max Rated Vol Flow Per Watt=[6.041E-005]. See Input Output Reference Manual for 
valid range.
2015-Mar-11 10:22:09 -        
2: For object = Coil:Cooling:DX:SingleSpeed, name = "COILCOOLING 1"
Calculated outlet air relative humidity greater than 1. The combination of
rated air volume flow rate, total cooling capacity and sensible heat ratio 
yields coil exiting
air conditions above the saturation curve. Possible fixes are to reduce the 
rated total cooling
capacity, increase the rated air volume flow rate, or reduce the rated sensible 
heat ratio for this coil.

As indicated in the error description, I was able to run the model successfully 
by increasing the Fan cfm from 700 to 960 cfm.  Alternatively, reducing the 
cooling capacity would also address this issue.

See attached file with the adjusted fan capacity.

Original comment by [email protected] on 11 Mar 2015 at 9:55

  • Changed state: WontFix

from cbecc.

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