[BLDG-SIM] eQuest Chiller Curve follies..

[gail]

There's an advanced simulation guidebook for modeling chiller curves on the
Energy Design Resources website.  It addresses a number of questions
regarding chiller curves in DOE-2.1 and DOE-2.2, particularly for chillers
having variable speed drives.

http://www.energydesignresources.com/resource/202/

Best Regards,
Gail Stranske

On 12/19/06, Aulbach, John <jaulbach at nexant.com> wrote:
>
>   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
>
>
>
>
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