[BLDG-SIM] Screw chiller performance curves

Steve Gates stvgates at pacbell.net
Wed Jan 16 12:31:13 PST 2002


James Hirsch & Associates is currently implementing new chiller algorithms in DOE-2, and defaults performance curves for screw chillers will be included. 

For both reciprocating and screw chillers, the program will use different performance curves depending on the number of compressors in the machine. The program will also model centrifugal chillers with variable-speed drives. Since some of these curves utilize new types of CURVE-FITS, they require a new version of DOE-2.2 which won't be released for another month or two.

In the meantime, for current versions of DOE-2.2, the following models a water-cooled screw:

"ScrewH2O-Cap-fCHWT&LCT" = CURVE-FIT    

   TYPE = BI-QUADRATIC-T

   INPUT-TYPE = DATA

   IN-TEMP1 = ( 44.0, 44.0, 44.0, 44.0, 44.0,  $ CHW T

                48.0, 48.0, 48.0, 48.0, 48.0,

                52.0, 52.0, 52.0, 52.0, 51.0,

                40.0, 40.0, 40.0, 40.0, 40.0)

   IN-TEMP2 = ( 85.0, 75.0, 70.0, 95.0, 100.,  $ ECT

                85.0, 75.0, 70.0, 95.0, 100.,

                85.0, 75.0, 70.0, 95.0, 100.,

                85.0, 75.0, 70.0, 95.0, 100.)

   OUTPUT  = (  1.00, 1.07, 1.10, 0.92, 0.89,  $ Capacity ratio

                1.09, 1.16, 1.18, 1.00, 0.96,

                1.18, 1.24, 1.26, 1.09, 1.05,

                0.92, 0.99, 1.02, 0.85, 0.83)  ..

 

"ScrewH2O-EIR-fCHWT&LCT" = CURVE-FIT     

   TYPE = BI-QUADRATIC-T

   INPUT-TYPE = DATA

   IN-TEMP1 = ( 44.0, 44.0, 44.0, 44.0, 44.0,  $ CHW T

                48.0, 48.0, 48.0, 48.0, 48.0,

                52.0, 52.0, 52.0, 52.0, 51.0,

                40.0, 40.0, 40.0, 40.0, 40.0)

   IN-TEMP2 = ( 85.0, 75.0, 70.0, 95.0, 100.,  $ ECT

                85.0, 75.0, 70.0, 95.0, 100.,

                85.0, 75.0, 70.0, 95.0, 100.,

                85.0, 75.0, 70.0, 95.0, 100.)

   OUTPUT  = (  1.00, 0.85, 0.78, 1.20, 1.31,  $ EIR ratio

                0.94, 0.81, 0.74, 1.13, 1.24,

                0.90, 0.77, 0.71, 1.07, 1.17,

                1.06, 0.89, 0.82, 1.27, 1.39)  ..



$ Two circuits, one compressor/circuit


"ScrewH2O-EIR-fPLR&dT-1Comp/Ckt" = CURVE-FIT 

   TYPE = QUADRATIC

   INPUT-TYPE = DATA

   INPUT   = ( 1.00, 0.75, 0.50, 0.25, 0.10)

   OUTPUT  = (  1.00, .906, .538, .332, .141)  ..

 

$ Two circuits, two compressors/circuit

"ScrewH2O-EIR-fPLR&dT-2Comp/Ckt" = CURVE-FIT  

   TYPE = QUADRATIC                           

   INPUT-TYPE = DATA

   INPUT    = ( 1.00, 0.75, 0.50, 0.25, 0.10)

   OUTPUT  = (  1.00, .842, .664, .289, .151)  ..




"A Generic Screw Chiller" = CHILLER

   TYPE             = ELEC-HERM-REC

   ELEC-INPUT-RATIO = .202

   CAPACITY-FT      = "ScrewH2O-Cap-fCHWT&LCT"

   EIR-FT           = "ScrewH2O-EIR-fCHWT&LCT"

   EIR-FPLR         = "ScrewH2O-EIR-fPLR&dT-1Comp/Ckt"

   etc.

   ..

   



Hope this helps!


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