# Chiller selection/modification for Ice storage

I am using the chillers provided by default for the CHILLER:ELECTRIC:REFORMULATEDEIR as

Bicubic:ReformEIRChiller Carrier 19XR 1259kW/6.26COP/Vanes EIRFPLR,

```
ReformEIRChiller Carrier 19XR 1259kW/6.26COP/Vanes EIRFPLR, !- Name
4.602131E-02, !- Coefficient1 Constant
2.433945E-02, !- Coefficient2 x
6.394526E-05, !- Coefficient3 x**2
-3.648563E-01, !- Coefficient4 y
1.854759E+00, !- Coefficient5 y**2
-2.809346E-02, !- Coefficient6 x*y
0.000000E+00, !- Coefficient7 x**3
-4.821515E-01, !- Coefficient8 y**3
0.000000E+00, !- Coefficient9 x**2*y
0.000000E+00, !- Coefficient10 x*y**2
14.56, !- Minimum Value of x
34.97, !- Maximum Value of x
0.18, !- Minimum Value of y
1.03, !- Maximum Value of y
, !- Minimum Curve Output
, !- Maximum Curve Output
Temperature, !- Input Unit Type for X
Dimensionless, !- Input Unit Type for Y
Dimensionless; !- Output Unit Type
```

Biquadratic:WC Screw Default 90.1-2004 Cap_fT

```
Curve:Biquadratic,
WC Screw Default 90.1-2004 Cap_fT, !- Name
0.9061150, !- Coefficient1 Constant
0.0292277, !- Coefficient2 x
-0.0003647, !- Coefficient3 x**2
-0.0009709, !- Coefficient4 y
-0.0000905, !- Coefficient5 y**2
0.0002527, !- Coefficient6 x*y
0.0, !- Minimum Value of x
20.0, !- Maximum Value of x
0.0, !- Minimum Value of y
50.0; !- Maximum Value of y
```

Biquadratic:WC Screw Default 90.1-2004 EIR_fT

```
Curve:Biquadratic,
WC Screw Default 90.1-2004 EIR_fT, !- Name
0.3617105, !- Coefficient1 Constant
-0.0229833, !- Coefficient2 x
-0.0009519, !- Coefficient3 x**2
0.0131889, !- Coefficient4 y
0.0003752, !- Coefficient5 y**2
-0.0007059, !- Coefficient6 x*y
0.0, !- Minimum Value of x
20.0, !- Maximum Value of x
0.0, !- Minimum Value of y
50.0; !- Maximum Value of y
```

Minimum temperature from the chiller outlet should be as low as (-)10 oC, The range of the leaving CW Temp is set 0 to 20. Is it safe to modify the range to meet the low temperature and get valid performance? The Included Chillers.idf have the curves with even narrower temperature range with the minimum around 4 oC.

I am getting some errors and I suspect they might be due to this limitation.

```
** Warning ** CHILLER:ELECTRIC:REFORMULATEDEIR "COOLSYS1 CHILLER 1": The evaporator outlet temperature (-0.51 C) is outside the range of evaporator outlet temperatures (X var) given in Cooling Capacity Function of Temperature biquadratic curve = WC SCREW DEFAULT 90.1-2004 CAP_FT
** ~~~ ** The range specified = 0.00 C to 20.00 C. Environment=TAMPA INTERNATIONAL AP ANN CLG .4% CONDNS WB=>MDB HVAC Sizing Pass 1, at Simulation time=08/21 00:30 - 00:40
** Warning ** CHILLER:ELECTRIC:REFORMULATEDEIR "COOLSYS1 CHILLER 1": The condenser outlet temperature (35.01 C) is outside the range of condenser outlet temperatures (X var) given in Electric Input to Cooling Output Ratio Function of Part-load Ratio bicubic curve = REFORMEIRCHILLER CARRIER 19XR 1259KW/6.26COP/VANES EIRFPLR
** ~~~ ** The range specified = 14.56 C to 34.97 C. Environment=TAMPA INTERNATIONAL AP ANN CLG .4% CONDNS WB=>MDB HVAC Sizing Pass 1, at Simulation time=08/21 09:50 - 10:00
************* ** Warning ** CHILLER:ELECTRIC:REFORMULATEDEIR "COOLSYS1 CHILLER 1": The evap outlet ...
```