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kbenne / cbecc

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CBECC-Com Issue - Other #955

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Version = 2013_3a_687

Category = Other

The program crashes when I get to 87% completion with the error message shown 
below.

Original issue reported on code.google.com by f.le...@gmail.com on 9 Mar 2015 at 11:00

GoogleCodeExporter commented 9 years ago 
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 cnambiar@archenergy.com on 11 Mar 2015 at 9:55