[bldg-sim] question about customed chiller curve

[Gary Zeng]

Dear guys:
Sorry for take your time again.
Now we are working on a project in which we need to custom the chiller curve 
for both screwed chiller and the hermetic centrifugal one.
As i searched the Doe manual and the help files, the instruction suad that 
we can do this by input the raw data of chiller part load conditions. It 
works, but I still have some problems.
1 in the EIR-CHWT/ECT curve, what is the CHWT and ECT exactly mean?
Are they the leaving chillered water temperature and entering condensing 
temperature?
2 in the EIR-PLR/dT cueve,what is the delta temperature, or in other words, 
which two temperatures is used here to get the delta T.
3 i would like to know if there are any examples on how to do this, 

I attched my personnal curve here for your reference. By the way, the space 
cooling energy is a little big when using my curve compared with the ones 
from the lib. In my case, i applied all of my three personal curve. 

"tr-cap-fchwt&ect" = CURVE-FIT
  TYPE             = BI-QUADRATIC-T
  INPUT-TYPE       = DATA
  INDEPENDENT-1    = ( 44.6, 44.6, 44.6, 44.6, 44.6, 44.6, 44.6, 44.6 )
  INDEPENDENT-2    = ( 89.6, 84.69, 79.75, 74.84, 69.93, 64.99, 64.99, 64.99 
)
  DEPENDENT        = ( 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3 )
  ..
"tr-eir-fchwt&ect" = CURVE-FIT
  TYPE             = BI-QUADRATIC-T
  INPUT-TYPE       = DATA
  INDEPENDENT-1    = ( 44.6, 44.6, 44.6, 44.6, 44.6, 44.6, 44.6, 44.6 )
  INDEPENDENT-2    = ( 89.6, 84.69, 79.75, 74.84, 69.926, 64.99, 64.99,
        64.99 )
  DEPENDENT        = ( 1, 0.926, 0.869, 0.822, 0.742, 0.68, 0.85, 1.05 )
  ..
"tr-" = CURVE-FIT
  TYPE             = BI-QUADRATIC-RATIO&DT
  INPUT-TYPE       = DATA
  INDEPENDENT-1    = ( 1, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3 )
  INDEPENDENT-2    = ( 45, 40.086, 35.154, 30.24, 25.326, 20.394, 20.394,
        20.394 )
  DEPENDENT        = ( 1, 0.926, 0.869, 0.822, 0.742, 0.68, 0.85, 1.05 )
  .. 

Your reply and youe help will be greatly appreciated. 


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