[BLDG-SIM] DOE2.1E Chiller performance
Varkie Thomas
Varkie.Thomas at som.com
Wed May 14 08:42:56 PDT 2003
We are trying to compare the performance of a 2000 ton chiller operating at (1) 42 F LWT and (2) 38 F LWT. The chiller EWT is 56 in both cases. The tower temp range is 85 F to 100 F. We want to know how the chiller COP varies under these conditions.
The hourly output for the design day from DOE2.1E shows chiller LWT of 44 F (DOE2 default) no matter what the input. Here is the input and output for the option with 38 F Chiller LWT. Can the Chiller LWT be changed from the default value of 44 F ? How do I check that the CHW EWT & LWT temps are being maintained? Is the input below correct to model the conditions described?
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PLANT-PARAMETERS
CHILL-WTR-T = 37 $ Def = 44. LWT at bottom of Thrott Range $
CHILL-WTR-THROTT = 2.0 $ Def = 2.5. Thrott Range = 37 to 39. LWT = 38 $
TWR-SETPT-T = 85
TWR-DESIGN-RANGE = 15.0 $ Def = 10. Tower temp range :85 to 100 $
CCIRC-DESIGN-T-DROP = 18 $ Def = 10. Chiller EWT = 56 $
----------------------------------------------------------------
MMDDHH OPEN-CEN OPEN-CEN OPEN-CEN OPEN-CEN OPEN-CEN OPEN-CEN
T-CHLR T-CHLR T-CHLR T-CHLR T-CHLR T-CHLR
LOAD ELECTRIC OPER PT FRAC HR ENTERING LEAVING
USE LD RATIO OPERATED COND TEM COLD TEM
BTU/HR KW FRAC.OR FRAC.OR F F
MULT. MULT.
----( 1) ----( 3) ----(10) ----(11) ----(12) ----(13)
7 1 1 0. 0.000 0.000 0.000 0.0 0.0
7 1 2 0. 0.000 0.000 0.000 0.0 0.0
7 1 3 0. 0.000 0.000 0.000 0.0 0.0
7 1 4 0. 0.000 0.000 0.000 0.0 0.0
7 1 5 0. 0.000 0.000 0.000 0.0 0.0
7 1 6 8887730. 528.301 0.328 1.000 84.6 44.0
7 1 7 20704076. 1019.228 0.760 1.000 83.7 44.0
7 1 8 25529894. 1301.530 0.940 1.000 84.3 44.0
7 1 9 25563408. 1312.150 0.944 1.000 84.7 44.0
7 110 22676038. 1142.870 0.838 1.000 84.9 44.0
7 111 23148816. 1167.610 0.855 1.000 84.7 44.0
7 112 22012680. 1103.797 0.813 1.000 84.7 44.0
7 113 22536236. 1132.213 0.832 1.000 84.7 44.0
7 114 22738694. 1144.069 0.840 1.000 84.7 44.0
7 115 22827700. 1149.287 0.843 1.000 84.7 44.0
7 116 22768860. 1146.011 0.841 1.000 84.7 44.0
7 117 21899154. 1097.228 0.809 1.000 84.7 44.0
7 118 20232738. 1007.025 0.747 1.000 84.7 44.0
7 119 0. 0.000 0.000 0.000 0.0 0.0
7 120 0. 0.000 0.000 0.000 0.0 0.0
7 121 0. 0.000 0.000 0.000 0.0 0.0
7 122 0. 0.000 0.000 0.000 0.0 0.0
7 123 0. 0.000 0.000 0.000 0.0 0.0
7 124 0. 0.000 0.000 0.000 0.0 0.0
===========================
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