[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!
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20020116/1231451e/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Steven D. Gates.vcf
Type: text/x-vcard
Size: 628 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20020116/1231451e/attachment.vcf>
More information about the Bldg-sim
mailing list