CHILLER:ELECTRIC:EIR

This chiller model is the empirical model from the DOE-2 building Energy simulation program. Chiller performance at off-reference conditions is modeled using three polynomial equations. Three curves objects are required.

Name

Type: alphanumeric

Reference Capacity

Type: real number
Unit: W

Reference COP

Type: real number
Efficiency of the chiller compressor (cooling output/compressor energy input). Condenser fan power should not be included here.
Unit: W/W

Reference Leaving Chilled Water Temperature

Type: real number
Unit: C
Default: 6.67

Reference Entering Condenser Fluid Temperature

Type: real number
Unit: C
Default: 29.4

Reference Chilled Water Flow Rate

Type: real number
Unit: m3/s

Reference Condenser Fluid Flow Rate

Type: real number
This field is only used for Condenser Type = AirCooled or EvaporativelyCooled when Heat Recovery is specified
Unit: m3/s
Minimum: 0.0

Cooling Capacity Function of Temperature Curve Name

Type: list of objects (CURVE:BIQUADRATIC, CURVE:CUBICLINEAR, TABLE:LOOKUP, CURVE:QUADRATICLINEAR, CURVE:FANPRESSURERISE or CURVE:BICUBIC)
Cooling capacity as a function of CW supply temp and entering condenser temp curve = a + b*CWS + c*CWS**2 + d*ECT + e*ECT**2 + f*CWS*ECT CWS = supply (leaving) chilled water temperature(C) ECT = entering condenser fluid temperature(C)

Electric Input to Cooling Output Ratio Function of Temperature Curve Name

Type: list of objects (CURVE:BIQUADRATIC, CURVE:CUBICLINEAR, TABLE:LOOKUP, CURVE:QUADRATICLINEAR, CURVE:FANPRESSURERISE or CURVE:BICUBIC)
Electric Input Ratio (EIR) as a function of temperature EIR = 1/COP curve = a + b*CWS + c*CWS**2 + d*ECT + e*ECT**2 + f*CWS*ECT CWS = supply (leaving) chilled water temperature(C) ECT = entering condenser fluid temperature(C)

Electric Input to Cooling Output Ratio Function of Part Load Ratio Curve Name

Type: list of objects (CURVE:EXPONENTIALDECAY, CURVE:FUNCTIONAL:PRESSUREDROP, CURVE:DOUBLEEXPONENTIALDECAY, CURVE:SIGMOID, CURVE:CUBIC, CURVE:EXPONENTIALSKEWNORMAL, CURVE:LINEAR, CURVE:EXPONENT, TABLE:LOOKUP, CURVE:QUARTIC, CURVE:QUADRATIC, CURVE:RECTANGULARHYPERBOLA1 or CURVE:RECTANGULARHYPERBOLA2)
Electric Input Ratio (EIR) as a function of Part Load Ratio (PLR) EIR = 1/COP quadratic curve = a + b*PLR + c*PLR**2 is typical, other univariate curves may be used PLR = part load ratio (cooling load/steady state capacity)

Minimum Part Load Ratio

Type: real number
Part load ratio below which the chiller starts cycling on/off to meet the load. Must be less than or equal to Maximum Part Load Ratio.
Minimum: 0.0
Default: 0.1

Maximum Part Load Ratio

Type: real number
Maximum allowable part load ratio. Must be greater than or equal to Minimum Part Load Ratio.
Default: 1.0

Optimum Part Load Ratio

Type: real number
Optimum part load ratio where the chiller is most efficient. Must be greater than or equal to the Minimum Part Load Ratio and less than or equal to the Maximum Part Load Ratio.
Default: 1.0

Minimum Unloading Ratio

Type: real number
Part load ratio where the chiller can no longer unload and false loading begins. Minimum unloading ratio must be greater than or equal to the Minimum Part Load Ratio and less than or equal to the Maximum Part Load Ratio.
Minimum: 0.0
Default: 0.2

Chilled Water Inlet Node Name

Type: node

Chilled Water Outlet Node Name

Type: node

Condenser Inlet Node Name

Type: node
Not required if air-cooled or evaporatively-cooled

Condenser Outlet Node Name

Type: node
Not required if air-cooled or evaporatively-cooled

Condenser Type

Type: choice (AirCooled, WaterCooled or EvaporativelyCooled)
Default: WaterCooled

Condenser Fan Power Ratio

Type: real number
Use for air-cooled or evaporatively-cooled condensers. Ratio of condenser fan power to reference chiller capacity
Unit: W/W
Minimum: 0.0
Default: 0.0

Fraction of Compressor Electric Consumption Rejected by Condenser

Type: real number
Fraction of compressor electrical energy that must be rejected by the condenser. Enter a value of 1.0 when modeling hermetic chillers. For open chillers, enter the compressor motor efficiency. This value should be greater than 0.6 for practical applications.
Maximum: 1.0
Default: 1.0

Leaving Chilled Water Lower Temperature Limit

Type: real number
Unit: C
Default: 2.0

Chiller Flow Mode

Type: choice (ConstantFlow, LeavingSetpointModulated or NotModulated)
Select operating mode for fluid flow through the chiller. "NotModulated" is for either variable or constant pumping with flow controlled by the external plant system. "ConstantFlow" is for constant pumping with flow controlled by chiller to operate at full design flow rate. "LeavingSetpointModulated" is for variable pumping with flow controlled by chiller to vary flow to target a leaving temperature setpoint.
Default: NotModulated

Design Heat Recovery Water Flow Rate

Type: real number
If non-zero, then the heat recovery inlet and outlet node names must be entered. Heat recovery is only available with Condenser Type = WaterCooled.
Unit: m3/s
Minimum: 0.0
Default: 0.0

Heat Recovery Inlet Node Name

Type: node

Heat Recovery Outlet Node Name

Type: node

Sizing Factor

Type: real number
Multiplies the autosized capacity and flow rates
Default: 1.0

Basin Heater Capacity

Type: real number
This field is only used for Condenser Type = EvaporativelyCooled and for periods when the basin heater is available (field Basin Heater Operating Schedule Name). For this situation, the heater maintains the basin water temperature at the basin heater setpoint temperature when the outdoor air temperature falls below the setpoint temperature. The basin heater only operates when the chiller is not operating.
Unit: W/K
Minimum: 0.0
Default: 0.0

Basin Heater Setpoint Temperature

Type: real number
This field is only used for Condenser Type = EvaporativelyCooled. Enter the outdoor dry-bulb temperature when the basin heater turns on.
Unit: C
Minimum: 2.0
Default: 2.0

Basin Heater Operating Schedule Name

Type: list of objects (SCHEDULE:FILE, SCHEDULE:CONSTANT, SCHEDULE:YEAR, EXTERNALINTERFACE:FUNCTIONALMOCKUPUNITIMPORT:TO:SCHEDULE, SCHEDULE:COMPACT or EXTERNALINTERFACE:SCHEDULE)
This field is only used for Condenser Type = EvaporativelyCooled. Schedule values greater than 0 allow the basin heater to operate whenever the outdoor air dry-bulb temperature is below the basin heater setpoint temperature. If a schedule name is not entered, the basin heater is allowed to operate throughout the entire simulation.

Condenser Heat Recovery Relative Capacity Fraction

Type: real number
This optional field is the fraction of total rejected heat that can be recovered at full load
Minimum: 0.0
Maximum: 1.0

Heat Recovery Inlet High Temperature Limit Schedule Name

Heat Recovery Leaving Temperature Setpoint Node Name

Type: node
This optional field provides control over the heat recovery Using this triggers a model more suited to series bundle and chillers with higher temperature heat recovery If this field is not used, the bundles are modeled as being in parallel

End-Use Subcategory

Type: alphanumeric
Any text may be used here to categorize the end-uses in the ABUPS End Uses by Subcategory table.
Default: General