Class CompressorChartAlternativeMapLookup

java.lang.Object

neqsim.process.equipment.compressor.CompressorChart

neqsim.process.equipment.compressor.CompressorChartAlternativeMapLookup

All Implemented Interfaces:

Serializable, Cloneable, CompressorChartInterface

Direct Known Subclasses:

CompressorChartAlternativeMapLookupExtrapolate

public class CompressorChartAlternativeMapLookup
extends CompressorChart
implements CompressorChartInterface, Serializable

CompressorChartAlternativeMapLookup class.

Version:

$Id: $Id

Author:

asmund

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
(package private) double[]	chartConditions
(package private) org.apache.commons.math3.analysis.polynomials.PolynomialFunction	fanLawCorrectionFunc
(package private) double	gearRatio
private String	headUnit
(package private) boolean	isStoneWall
(package private) boolean	isSurge
(package private) static org.apache.logging.log4j.Logger	logger	Logger object for class.
(package private) org.apache.commons.math3.analysis.polynomials.PolynomialFunction	reducedHeadFitterFunc
(package private) org.apache.commons.math3.analysis.polynomials.PolynomialFunction	reducedPolytropicEfficiencyFunc
(package private) double	referenceSpeed
(package private) double	refMW
(package private) double	refPressure
(package private) double	refTemperature
(package private) double	refZ
private static final long	serialVersionUID	Serialization version UID.
private boolean	useCompressorChart
private boolean	useRealKappa

Fields inherited from class CompressorChart

chartSpeeds, chartValues, fanLawCorrectionFitter, flow, flowPolytropicEfficiency, head, maxSpeedCurve, minSpeedCurve, polytropicEfficiency, redflow, redflowPolytropicEfficiency, redhead, redpolytropicEfficiency, reducedFlowFitter, reducedHeadFitter, reducedPolytropicEfficiencyFitter, speed, stoneWallCurve, surgeCurve

Constructor Summary

Constructors

Constructor	Description
CompressorChartAlternativeMapLookup()	Constructor for CompressorChartAlternativeMapLookup.

Method Summary

Modifier and Type	Method	Description
void	addCurve(double speed, double[] flow, double[] head, double[] polytropicEfficiency)	This method is used add a curve to the CompressorChart object.
void	addCurve(double speed, double[] flow, double[] head, double[] flowPolytropicEfficiency, double[] polytropicEfficiency)	This method is used add a curve to the CompressorChart object.
void	addSurgeCurve(double[] flow, double[] head)	addSurgeCurve.
static int	bisect_left(Double[] A, double x)	bisect_left.
static int	bisect_left(Double[] A, double x, int lo, int hi)	bisect_left.
boolean	checkStoneWall(double flow, double speed)	checkStoneWall.
boolean	checkSurge1(double flow, double head)	checkSurge1.
boolean	checkSurge2(double flow, double speed)	checkSurge2.
double[]	getChartConditions()	Get the chart conditions (e.g., reference molecular weight).
ArrayList<CompressorCurve>	getChartValues()	getChartValues.
ArrayList<Double>	getClosestRefSpeeds(double speed)	getClosestRefSpeeds.
CompressorCurve	getCurveAtRefSpeed(double refSpeed)	getCurveAtRefSpeed.
double	getFlow(double head, double speed, double guessFlow)	getFlow.
double[][]	getFlows()	Get the flow values for all compressor curves.
double	getGearRatio()	Getter for the field gearRatio.
double[][]	getHeads()	Get the head values for all compressor curves.
String	getHeadUnit()	get the selected unit of head.
double	getMaxSpeedCurve()	Getter for the field maxSpeedCurve.
double	getMinSpeedCurve()	Getter for the field minSpeedCurve.
double[][]	getPolytropicEfficiencies()	Get the polytropic efficiency values for all compressor curves.
double	getPolytropicEfficiency(double flow, double speed)	Get method for polytropic efficiency from reference curves.
double	getPolytropicHead(double flow, double speed)	Get method for polytropic head from reference curves.
int	getSpeed(double flow, double head)	getSpeed.
double[]	getSpeeds()	Get the speed values for all compressor curves.
double	getSpeedValue(double flow, double head)	Calculate the speed required to achieve a given head at a given flow rate.
StoneWallCurve	getStoneWallCurve()	getStoneWallCurve.
SafeSplineSurgeCurve	getSurgeCurve()	getSurgeCurve.
boolean	isUseCompressorChart()	Checks if set to use compressor chart for compressor calculations (chart is set for compressor).
static void	main(String[] args)	main.
void	plot()	plot.
double	polytropicEfficiency(double flow, double speed)	polytropicEfficiency.
void	prettyPrintChartValues()	Pretty print all CompressorCurve objects in chartValues.
void	setCurves(double[] chartConditions, double[] speed, double[][] flow, double[][] head, double[][] polyEff)	This method is used add a set of curves to the CompressorChart object.
void	setCurves(double[] chartConditions, double[] speed, double[][] flow, double[][] head, double[][] flowPolyEff, double[][] polyEff)	This method is used add a set of curves to the CompressorChart object.
void	setGearRatio(double GR)	Setter for the field gearRatio.
void	setHeadUnit(String headUnit)	set unit of head.
void	setReferenceConditions(double refMW, double refTemperature, double refPressure, double refZ)	Set method for the reference conditions of the compressor chart.
void	setStoneWallCurve(StoneWallCurve stoneWallCurve)	setStoneWallCurve.
void	setSurgeCurve(SafeSplineSurgeCurve surgeCurve)	setSurgeCurve.
void	setUseCompressorChart(boolean useCompressorChart)	Set compressor calculations to use compressor chart.
void	setUseRealKappa(boolean useRealKappa)	set method for kappa setting. true = real kappa is used, false = ideal kappa is used
boolean	useRealKappa()	get method for kappa setting. true = real kappa is used, false = ideal kappa is used

Methods inherited from class CompressorChart

equals, fitReducedCurve, generateStoneWallCurve, generateSurgeCurve, getDischargeTemperatures, getGamma, getInletPressure, getInletTemperature, getPolytropicExponent, getPowers, getPressureRatios, getReferenceDensity, getStoneWallFlowAtSpeed, getStoneWallHeadAtSpeed, getSurgeFlowAtSpeed, getSurgeHeadAtSpeed, hashCode, setGamma, setInletPressure, setInletTemperature, setMaxSpeedCurve, setMinSpeedCurve, setPolytropicExponent, setReferenceDensity

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface CompressorChartInterface

equals, generateStoneWallCurve, generateSurgeCurve, getDischargeTemperatures, getGamma, getInletPressure, getInletStream, getInletTemperature, getOperatingMW, getPolytropicExponent, getPowers, getPressureRatios, getRatioToMaxSpeed, getRatioToMinSpeed, getReferenceDensity, getStoneWallFlowAtSpeed, getStoneWallHeadAtSpeed, getSurgeFlowAtSpeed, getSurgeHeadAtSpeed, hashCode, isHigherThanMaxSpeed, isLowerThanMinSpeed, isSpeedWithinRange, setGamma, setInletPressure, setInletStream, setInletTemperature, setOperatingMW, setPolytropicExponent, setReferenceDensity

Field Details

serialVersionUID

private static final long serialVersionUID

Serialization version UID.

See Also:

• Constant Field Values

logger

static org.apache.logging.log4j.Logger logger

Logger object for class.

isSurge

boolean isSurge

isStoneWall

boolean isStoneWall

refMW

double refMW

headUnit

private String headUnit

useCompressorChart

private boolean useCompressorChart

refTemperature

double refTemperature

refPressure

double refPressure

referenceSpeed

double referenceSpeed

refZ

double refZ

useRealKappa

private boolean useRealKappa

chartConditions

double[] chartConditions

reducedHeadFitterFunc

org.apache.commons.math3.analysis.polynomials.PolynomialFunction reducedHeadFitterFunc

reducedPolytropicEfficiencyFunc

org.apache.commons.math3.analysis.polynomials.PolynomialFunction reducedPolytropicEfficiencyFunc

fanLawCorrectionFunc

org.apache.commons.math3.analysis.polynomials.PolynomialFunction fanLawCorrectionFunc

gearRatio

double gearRatio

Constructor Details

CompressorChartAlternativeMapLookup

public CompressorChartAlternativeMapLookup()

Constructor for CompressorChartAlternativeMapLookup.

Method Details

addCurve

public void addCurve(double speed,
 double[] flow,
 double[] head,
 double[] polytropicEfficiency)

This method is used add a curve to the CompressorChart object.

Specified by:

addCurve in interface CompressorChartInterface

Overrides:

addCurve in class CompressorChart

Parameters:

speed - a double

flow - an array of type double

head - an array of type double

polytropicEfficiency - an array of type double

addCurve

public void addCurve(double speed,
 double[] flow,
 double[] head,
 double[] flowPolytropicEfficiency,
 double[] polytropicEfficiency)

This method is used add a curve to the CompressorChart object.

Specified by:

addCurve in interface CompressorChartInterface

Overrides:

addCurve in class CompressorChart

Parameters:

speed - a double

flow - an array of type double

head - an array of type double

flowPolytropicEfficiency - an array of type double

polytropicEfficiency - an array of type double

setCurves

public void setCurves(double[] chartConditions,
 double[] speed,
 double[][] flow,
 double[][] head,
 double[][] polyEff)

This method is used add a set of curves to the CompressorChart object.

This method initializes the compressor performance curves, including speed, flow, head, and polytropic efficiency.

The method takes chart conditions and initializes internal variables for different performance parameters based on input arrays for speed, flow, head, and polytropic efficiency. It also normalizes these parameters by calculating reduced values based on speed.

Sets the compressor curves based on the provided chart conditions, speed, flow, head, and polytropic efficiency values.

Specified by:

setCurves in interface CompressorChartInterface

Overrides:

setCurves in class CompressorChart

Parameters:

chartConditions - an array of type double

speed - an array of type double

flow - an array of type double

head - an array of type double

polyEff - an array of type double

setCurves

public void setCurves(double[] chartConditions,
 double[] speed,
 double[][] flow,
 double[][] head,
 double[][] flowPolyEff,
 double[][] polyEff)

This method is used add a set of curves to the CompressorChart object.

This method initializes the compressor performance curves, including speed, flow, head, and polytropic efficiency.

The method takes chart conditions and initializes internal variables for different performance parameters based on input arrays for speed, flow, head, and polytropic efficiency. It also normalizes these parameters by calculating reduced values based on speed.

Sets the compressor curves based on the provided chart conditions, speed, flow, head, flowPolytrpicEfficiency and polytropic efficiency values.

Specified by:

setCurves in interface CompressorChartInterface

Overrides:

setCurves in class CompressorChart

Parameters:

chartConditions - an array of type double

speed - an array of type double

flow - an array of type double

head - an array of type double

flowPolyEff - an array of type double

polyEff - an array of type double

getClosestRefSpeeds

public ArrayList<Double> getClosestRefSpeeds(double speed)

getClosestRefSpeeds.

Retrieves the closest reference speeds to the given speed from the compressor chart values. The method returns a list containing one or two speeds: - If the given speed matches a reference speed, the list contains only that speed. - If the given speed is between two reference speeds, the list contains both speeds. - If the given speed is less than the lowest reference speed, the list contains the lowest reference speed. - If the given speed is greater than the highest reference speed, the list contains the highest reference speed.

Parameters:

speed - the speed to find the closest reference speeds for

Returns:

a ArrayList of the closest reference speeds

getPolytropicHead

public double getPolytropicHead(double flow,
 double speed)

Get method for polytropic head from reference curves.

This method interpolates the polytropic head values from reference speeds closest to the given speed and averages them to estimate the polytropic head at the specified flow and speed.

Specified by:

getPolytropicHead in interface CompressorChartInterface

Overrides:

getPolytropicHead in class CompressorChart

Parameters:

flow - [m3/h], speed in [rpm].

speed - a double

Returns:

polytropic head in unit [getHeadUnit]

getPolytropicEfficiency

public double getPolytropicEfficiency(double flow,
 double speed)

Get method for polytropic efficiency from reference curves.

Calculates the polytropic efficiency of the compressor for a given flow and speed. The method interpolates the efficiency values from reference speed curves and averages them to estimate the efficiency at the specified conditions.

Specified by:

getPolytropicEfficiency in interface CompressorChartInterface

Overrides:

getPolytropicEfficiency in class CompressorChart

Parameters:

flow - [m3/h], speed in [rpm].

speed - a double

Returns:

polytropic efficiency [%].

addSurgeCurve

public void addSurgeCurve(double[] flow,
 double[] head)

addSurgeCurve.

Overrides:

addSurgeCurve in class CompressorChart

Parameters:

flow - an array of type double

head - an array of type double

getCurveAtRefSpeed

public CompressorCurve getCurveAtRefSpeed(double refSpeed)

getCurveAtRefSpeed.

Parameters:

refSpeed - a double

Returns:

a CompressorCurve object

getGearRatio

public double getGearRatio()

Getter for the field gearRatio.

Returns:

a double

setGearRatio

public void setGearRatio(double GR)

Setter for the field gearRatio.

Parameters:

GR - a double

polytropicEfficiency

public double polytropicEfficiency(double flow,
 double speed)

polytropicEfficiency.

Overrides:

polytropicEfficiency in class CompressorChart

Parameters:

flow - a double

speed - a double

Returns:

a double

getSpeed

public int getSpeed(double flow,
 double head)

getSpeed.

Specified by:

getSpeed in interface CompressorChartInterface

Overrides:

getSpeed in class CompressorChart

Parameters:

flow - a double

head - a double

Returns:

a int

getSpeedValue

public double getSpeedValue(double flow,
 double head)

Calculate the speed required to achieve a given head at a given flow rate.

This method uses a robust Newton-Raphson algorithm with fan-law based initial guess, bounds protection, damped updates, and bisection fallback for reliable convergence both within and outside the defined speed curve range.

Specified by:

getSpeedValue in interface CompressorChartInterface

Overrides:

getSpeedValue in class CompressorChart

Parameters:

flow - the volumetric flow rate in m³/hr

head - the required polytropic head in the chart's head unit (kJ/kg or meter)

Returns:

the calculated speed in RPM (as double for precision)

checkSurge1

public boolean checkSurge1(double flow,
 double head)

checkSurge1.

checkSurge1.

Overrides:

checkSurge1 in class CompressorChart

Parameters:

flow - a double

head - a double

Returns:

a boolean

checkSurge2

public boolean checkSurge2(double flow,
 double speed)

checkSurge2.

checkSurge2.

Overrides:

checkSurge2 in class CompressorChart

Parameters:

flow - a double

speed - a double

Returns:

a boolean

checkStoneWall

public boolean checkStoneWall(double flow,
 double speed)

checkStoneWall.

checkStoneWall.

Overrides:

checkStoneWall in class CompressorChart

Parameters:

flow - a double

speed - a double

Returns:

a boolean

setReferenceConditions

public void setReferenceConditions(double refMW,
 double refTemperature,
 double refPressure,
 double refZ)

Set method for the reference conditions of the compressor chart.

Specified by:

setReferenceConditions in interface CompressorChartInterface

Overrides:

setReferenceConditions in class CompressorChart

Parameters:

refMW - a double

refTemperature - a double

refPressure - a double

refZ - a double

getSurgeCurve

public SafeSplineSurgeCurve getSurgeCurve()

getSurgeCurve.

Specified by:

getSurgeCurve in interface CompressorChartInterface

Overrides:

getSurgeCurve in class CompressorChart

Returns:

a SafeSplineSurgeCurve object

setSurgeCurve

public void setSurgeCurve(SafeSplineSurgeCurve surgeCurve)

setSurgeCurve.

Specified by:

setSurgeCurve in interface CompressorChartInterface

Overrides:

setSurgeCurve in class CompressorChart

Parameters:

surgeCurve - a SafeSplineSurgeCurve object

getStoneWallCurve

public StoneWallCurve getStoneWallCurve()

getStoneWallCurve.

Specified by:

getStoneWallCurve in interface CompressorChartInterface

Overrides:

getStoneWallCurve in class CompressorChart

Returns:

a StoneWallCurve object

setStoneWallCurve

public void setStoneWallCurve(StoneWallCurve stoneWallCurve)

setStoneWallCurve.

Specified by:

setStoneWallCurve in interface CompressorChartInterface

Overrides:

setStoneWallCurve in class CompressorChart

Parameters:

stoneWallCurve - a StoneWallCurve object

main

public static void main(String[] args)

main.

Parameters:

args - an array of String objects

isUseCompressorChart

public boolean isUseCompressorChart()

Checks if set to use compressor chart for compressor calculations (chart is set for compressor).

Specified by:

isUseCompressorChart in interface CompressorChartInterface

Overrides:

isUseCompressorChart in class CompressorChart

Returns:

a boolean

setUseCompressorChart

public void setUseCompressorChart(boolean useCompressorChart)

Set compressor calculations to use compressor chart.

Specified by:

setUseCompressorChart in interface CompressorChartInterface

Overrides:

setUseCompressorChart in class CompressorChart

Parameters:

useCompressorChart - a boolean

getHeadUnit

public String getHeadUnit()

get the selected unit of head.

Specified by:

getHeadUnit in interface CompressorChartInterface

Overrides:

getHeadUnit in class CompressorChart

Returns:

unit of head

setHeadUnit

public void setHeadUnit(String headUnit)

set unit of head.

Specified by:

setHeadUnit in interface CompressorChartInterface

Overrides:

setHeadUnit in class CompressorChart

Parameters:

headUnit - a String object

useRealKappa

public boolean useRealKappa()

get method for kappa setting. true = real kappa is used, false = ideal kappa is used

Specified by:

useRealKappa in interface CompressorChartInterface

Overrides:

useRealKappa in class CompressorChart

Returns:

true/false flag

setUseRealKappa

public void setUseRealKappa(boolean useRealKappa)

set method for kappa setting. true = real kappa is used, false = ideal kappa is used

Specified by:

setUseRealKappa in interface CompressorChartInterface

Overrides:

setUseRealKappa in class CompressorChart

Parameters:

useRealKappa - a boolean

bisect_left

public static int bisect_left(Double[] A,
 double x)

bisect_left.

Parameters:

A - an array of Double objects

x - a double

Returns:

a int

bisect_left

public static int bisect_left(Double[] A,
 double x,
 int lo,
 int hi)

bisect_left.

Parameters:

A - an array of Double objects

x - a double

lo - a int

hi - a int

Returns:

a int

plot

public void plot()

plot.

Specified by:

plot in interface CompressorChartInterface

Overrides:

plot in class CompressorChart

getFlow

public double getFlow(double head,
 double speed,
 double guessFlow)

getFlow.

Specified by:

getFlow in interface CompressorChartInterface

Overrides:

getFlow in class CompressorChart

Parameters:

head - a double

speed - a double

guessFlow - a double

Returns:

a double

getMinSpeedCurve

public double getMinSpeedCurve()

Getter for the field minSpeedCurve.

Specified by:

getMinSpeedCurve in interface CompressorChartInterface

Overrides:

getMinSpeedCurve in class CompressorChart

Returns:

the minimum speed curve value in RPM

getMaxSpeedCurve

public double getMaxSpeedCurve()

Getter for the field maxSpeedCurve.

Specified by:

getMaxSpeedCurve in interface CompressorChartInterface

Overrides:

getMaxSpeedCurve in class CompressorChart

Returns:

a double

prettyPrintChartValues

public void prettyPrintChartValues()

Pretty print all CompressorCurve objects in chartValues.

getChartValues

public ArrayList<CompressorCurve> getChartValues()

getChartValues.

Returns:

a ArrayList object

getSpeeds

public double[] getSpeeds()

Get the speed values for all compressor curves.

Returns the speed values from the chartValues curves.

Specified by:

getSpeeds in interface CompressorChartInterface

Overrides:

getSpeeds in class CompressorChart

Returns:

an array of speed values in RPM, or null if not set

getFlows

public double[][] getFlows()

Get the flow values for all compressor curves.

Returns the flow values from the chartValues curves.

Specified by:

getFlows in interface CompressorChartInterface

Overrides:

getFlows in class CompressorChart

Returns:

a 2D array where each row corresponds to a speed and contains flow values in m3/hr, or null if not set

getHeads

public double[][] getHeads()

Get the head values for all compressor curves.

Returns the head values from the chartValues curves.

Specified by:

getHeads in interface CompressorChartInterface

Overrides:

getHeads in class CompressorChart

Returns:

a 2D array where each row corresponds to a speed and contains head values in the unit specified by getHeadUnit(), or null if not set

getPolytropicEfficiencies

public double[][] getPolytropicEfficiencies()

Get the polytropic efficiency values for all compressor curves.

Returns the polytropic efficiency values from the chartValues curves.

Specified by:

getPolytropicEfficiencies in interface CompressorChartInterface

Overrides:

getPolytropicEfficiencies in class CompressorChart

Returns:

a 2D array where each row corresponds to a speed and contains polytropic efficiency values in %, or null if not set

getChartConditions

public double[] getChartConditions()

Get the chart conditions (e.g., reference molecular weight).

Returns the chart conditions.

Specified by:

getChartConditions in interface CompressorChartInterface

Overrides:

getChartConditions in class CompressorChart

Returns:

an array of chart condition values, or null if not set