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Re: [EnergyPlus_Support] Electric Input to Cooling Output Ratio Function of Part Load Ratio Curve£¿
1. Yes, COP = 1/EIR.
2. This curve is a normalized (values should be from zero to 1) adjustment
which is multiplied times (1/"Design COP").
3. This curve is only a function of part-load ratio with fixed chilled water
and condenser water temperatures. One would expect the chiller to perform best
at full load for a given set of temperatures. There is a separate curve
"Electric Input to Cooling Output Ratio Function of Temperature Curve" which
adjusts for temperature. See the Engineering Document for detailed equations
for this chiller model. See especially the equation for Pchiller on p. 370
(pdf p. 401).
4. I am not surprised. Very few manufacturers share part-load performance
data.
Mike
On 6 Nov 2005, at 5:39, glasses12300202 wrote:
> I want a cop curve when it is part load ratio(PLR). In the E+
> example,it gives a curve like this¡£Shown as below:
> ! Energy Input to Cooling Output Ratio Function of Part Load Ratio
> Curve for open or hermetic water-cooled centrifugal chillers
> ! Same as DOE-2.1E HERM-CENT-EIR-FPLR (EIRPLR3) and OPEN-CENT-EIR-
> FPLR (EIRPLR1)
> CURVE:QUADRATIC,
> ChillerCentEIRFPLR, !- Name
> 0.222903, (c) !- Coeff1 Constant
> 0.313387, (b) !- Coeff2 x
> 0.463710, (a) !- Coeff3 x**2
> 0.0, !- minimum value of x
> 1.0; !- maximum value of x
>
> I draw the QUADRATIC ¡°y=a.*x.^2+b.*x+c¡± in the figure (see the
> uploaded file,please)
>
> 1. I found that when the PLR=1(full load), the cop(1/EIR)=1.
> As shown in I\O reference P462(E1.2.3),it says ¡®The EIR is the
> inverse of the COP¡¯ and ¡®the energy input to cooling output ratio
> (EIR)¡¯ .SO I think the cop=1/EIR .Am I right ?
> 2. IN ¡®Field: Electric Input to Cooling Output Ratio Function
> of Part Load Ratio Curve¡¯ , it also says ¡®This curve should have a
> value of 1.0 when the part-load ratio equals 1.0.¡¯ But I think
> when the PLR =1(full load),the cop should be higher than 1.
> 3 I think the curve should rise to the max value and then
> fall when the PLR changes from 0 to 1. BUT the figure does not
> show like this .Why ?
> 4. I need some curve(cop fuction of PLR) about WSHP or water
> chiller, can someone give me some advice ? I can not find it from
> the manufacture¡¯ swatch.
>
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> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
>
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>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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