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CBECC-Com Issue - HVAC #858

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
Version = 2013_3_653

Category = HVAC

Issue Summary:

I need help understanding an error message. I don’t know what coil bypass 
factors are. I don’t know how to revise the HVAC to accommodate the sizing 
inaccuracy.

EnergyPlus Fatal Error(s) (1):

2014-Nov-19 16:00:58 -        1: Coil:Cooling:DX:TwoSpeed "COILCOOLING 28" 
Errors found in calculating coil bypass factors

2014-Nov-19 16:00:58 -     EnergyPlus Severe Error(s) (2):

2014-Nov-19 16:00:58 -        1: Sizing: Coil:Cooling:DX:TwoSpeed "COILCOOLING 
28": 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=[9.646E-006], 
Max Rated Vol Flow Per Watt=[6.041E-005]. See Input Output Reference Manual for 
valid range.

List the steps taken to produce the error. For example:

1.      Open the file

2.      Run the analysis

3.      Review the log file

Original issue reported on code.google.com by f.le...@gmail.com on 20 Nov 2014 at 10:45

GoogleCodeExporter commented 9 years ago 
I suspect the second error message is the real issue here.  EnergyPlus only 
allows airflow per ton of cooling capacity of around 400 cfm/ton, with actual 
limits that I think are about 350 cfm/ton on the low end and 450 or 500 cfm/ton 
on the upper end.  Check the airflow and cooling capacity of CoilCooling 28 and 
make sure that the ratio is in that range.

Original comment by rhedr...@archenergy.com on 3 Dec 2014 at 12:39