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Re: [EnergyPlus_Support] about monthly "chiller cop"

The monthly output for Chiller COP will not be valid, as the note explains.  As 
suggested in the note, one approach is to report "Chiller Evap Heat Trans [J]" 
and "Chiller Electric Consumption [J]".  The COP can then be computed in a 
spreadsheet.  

An alternative approach is to use REPORT:TABLE:MONTHLY for "Chiller COP" and 
use the "HoursPositive" aggregation type in the first column, then report the 
"Chiller COP" again using "SumOrAverageDuringHoursShown".

Mike


On 17 Sep 2007 at 14:58, tjutw wrote:

> I run the example file "ElectricEIRChiller.idf" for whole year and
> report monthly chiller cop. It seems there are some errors about this
> value.  Based on P443 in inputoutputreference.pdf, 
> 
> "Note that this variable is reported as zero when the chiller is not
> operating. When reported for frequencies longer than "detailed" (such
> as timestep, hourly, daily, monthly or environment), this output will
> only be meaningful when the chiller is operating for the entire
> reporting period. To determine an average COP for a longer time
> period, compute the COP based on total evaporator heat transfer
> divided by total electric or fuel input over the desired period."
> 
> For example, the cop in July is 0.86 from EnergyPlus report. But the 
> value should be 2.78 according to the above calculation method. 
> 
> Anyone can help me out?


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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