[Bldg-sim] chiller performance curves?

Chien Si Harriman chien.harriman at iesve.com
Mon Dec 8 12:08:27 PST 2008


Hi all-
 
Sort of technical question here that requires some knowledge of the inner workings of either EnergyPlus or DOE2/eQuest...hoping there is someone out there who knows the answers to this.  What does either an EnergyPlus or DOE2 user have to do when dealing with different units, particularly when it comes to the curve fits?  Obviously, the same coefficients do not apply for both units.  Do the default curve coefficients for the chiller, for example, have both IP and metric equivalents?  
 
Does anyone know how this works?  Has anyone bumped into a regression model that can take raw data in metric units, and create a set of coefficients in one set of units (let's say IP for starters), and then use those newly-created coefficients, generate an new set of raw data, and then create a new regression to produce a new set of coefficients in converted units (Metric, in this case?)  
 
Has either DOE2 or EnergyPlus already solved this problem, and I don't need to even think about itanymore?
 
Thanks,
 
 
 
 
 
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