[EnergyPlus_Support] Re: COP of a chiller in operative conditions

[<fpasserini.tn@xxxxxxxxx>]

Actually, Iâ??m pretty satisfied with the results that I get now (after I have changed the â??EIR function of PLRâ?? curve).

As EIRFT curve Iâ??m using the following one:



Curve:Biquadratic,

    Clivet EIRFT,            !- Name

    0.63035,                 !- Coefficient1 Constant

    -.01942,                 !- Coefficient2 x

    0.00024,                 !- Coefficient3 x**2

    0.00171,                 !- Coefficient4 y

    0.00034,                 !- Coefficient5 y**2

    0.00013,                 !- Coefficient6 x*y

    5.0,                     !- Minimum Value of x

    20,                      !- Maximum Value of x

    24.0,                    !- Minimum Value of y

    42;                      !- Maximum Value of y



Then the curve is constant when the outdoor temperature is lower than 24°C (Minimum Value of y), it isnâ??t always constant: <http://oi62.tinypic.com/308zjug.jpg>http://oi62.tinypic.com/308zjug.jpg

To calculate the parameters I interpolated some operating points that are in the datasheet of the heat pump.

Some graphs that I obtained from the output data:

COPc and outdoor air temperature: <http://oi60.tinypic.com/30rpmhe.jpg>http://oi60.tinypic.com/30rpmhe.jpg

COPc and chiller inlet temperature: <http://oi57.tinypic.com/w882zr.jpg>http://oi57.tinypic.com/w882zr.jpg

Trend of COPc and temperatures in 10 days: <http://oi60.tinypic.com/12549ja.jpg>http://oi60.tinypic.com/12549ja.jpg

Regards

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