Chiller EIR default rated condition and curves don't match

[jmarrec]

The Default Chiller:ElectricEIR creates has a problem... At the rated conditions, the CAPFT and EIRFT will return a value different than 1.

model = OpenStudio::Model::Model.new
chiller = OpenStudio::Model::ChillerElectricEIR.new(model)
ref_lchwt = chiller.referenceLeavingChilledWaterTemperature
ref_ecnwt = chiller.referenceEnteringCondenserFluidTemperature
eirft = chiller.electricInputToCoolingOutputRatioFunctionOfTemperature

# EIRFT is wrong
eirft.evaluate(ref_lchwt, ref_ecnwt)
# => 0.8614399290202399

# CAPFT is wrong
capft = chiller.coolingCapacityFunctionOfTemperature
capft.evaluate(ref_lchwt, ref_ecnwt)
# => 1.0554712015060401

# EIRFPLR is ok
eirfplr = chiller.electricInputToCoolingOutputRatioFunctionOfPLR
eirfplr.evaluate(1)
# => 1.00138225

[kbenne]

@jmarrec I received data from you on the water cooled chiller. Do you have similar for air cooled?

[jmarrec]

Kyle,

I don't remember what I gave you exactly. I know it was at least the doe2 default chiller but also a couple more.

What do you need? (Knowing that I'm still on vacation and without access to a computer)

I have all the chillers from the EnergyPlus data set in osc format (need to find time to upload them to bcl with the bcl gem), but I think so do you: I suggest picking one there.
For air cooled, as far as I remember there aren't a lot of them, I'd start looking at the example files to find data (search with a regex for all chillers having a condenser type to air cooled for example

Envoyé de mon iPhone

Le 18 mars 2016 à 02:41, Kyle Benne notifications@github.com a écrit :

@jmarrec I received data from you on the water cooled chiller. Do you have similar for air cooled?

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[kbenne]

@jmarrec I thought I took care of this, but there is no record on the issue here. Can you confirm that this is what you want?

[jmarrec]

Sounds good to me. Have you run a test model to see if the warning "curve out of bound" pops up or not?

[MatthewSteen]

Dropping in an air-cooled chiller to 1.12.0 results in a warning for the EIRFTemp.

** Warning ** GetElectricEIRChillerInput: Chiller:Electric:EIR="CHILLER - AIR COOLED"
   **   ~~~   ** Energy input ratio as a function of temperature curve output is not equal to 1.0 (+ or - 10%) at reference conditions.
   **   ~~~   ** Curve output at reference conditions = 0.850

[macumber]

@kbenne is this complete?

[jmarrec]

Still the case in 2.2.1 today, same warning as @MatthewSteen gave above.