[bldg-sim] eQuest Chiller Curve follies..

[Aulbach, John]

Folks:
 
eQuest (as did its predecessor DOE-2.1) use three basic curves to define chiller performance:
 
1)  EIR-FT

Takes the U-name of a curve that adjusts the electric input ratio as a function of the leaving chilled water temperature and the condenser temperature. This curve should be normalized to 1.0 at the ARI point (RATED-CHW-T, RATED-COND-T, etc.). 


2) EIR-FPLR


Takes the U-name of a curve that adjusts the electric input ratio as a function of

     The part load ratio (PLR) -  The PLR is defined as the ratio of the hourly load to the hourly capacity;  Load / Caphour

     The evaporator/condenser dT -  The temperature differential between the condenser and leaving chilled-water. The  meaning of the condenser temperature varies according to condenser type. 


3) CAPACITY-FT


Takes the U-name of a curve that adjusts the capacity of the chiller as a function of the leaving evaporator water temperature and the condenser temperature. This curve should be normalized to 1.0 at the rated conditions (RATED-CHW-T, RATED-COND-T, etc.).

MY understanding is the the EIR-FPLR was always to be the part load curve based on a constant condenser water entering temperature (say 85°F) and that the program would use the other two curves to modify this based on other chilled and condenser water conditions.

NOW I see a new equation (new to me) in eQuest that I can apparently put in the ARI curve of a chiller (based on ARI prescribed condenser water relief) and the program will accept that.

Is this anyone else's understanding?

 
 
John R. Aulbach, PE, CEM
Project Manager
Nexant, Inc.
100 North Barranca, Suite 820
West Covina, CA 91791 USA
Phone: 626-430-9054
Fax: 626-430-9060
email: jaulbach at nexant.com <mailto:jaulbach at nexant.com> 
 
 


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