Calculator estimates energy consumption of operating Chillers, Pumps and Towers in a cooling system (both air & water). Allows: Input multiple & varying capacity and types of Chillers that are operating together. Flexible input for operating schedule for each Chiller. Apply changes ( improvements / measures) and compare & examine, quantifying energy and cost savings. Changes: Increasing the chilled water temperature Decreasing the condenser water temperature Replacing the chillers Applying variable speed control to circulation pump motors Upgrade Tower Cell Fan Motor controls Upgrades: Replace chiller refrigerant Install Variable Speed Drive (VSD) on Centrifugal compressors Use Free Cooling. More...

#include <process_cooling.h>

Classes
struct	AirCooledSystemInput

struct	ChillerInput

struct	ChillerOutput

struct	ChillerPumpingEnergyOutput

struct	PumpInput

struct	TowerInput

struct	TowerOutput

struct	WaterCooledSystemInput

Public Types
enum	RefrigerantType { R_11 , R_123 , R_12 , R_134a , R_22 , R_717 }

enum	ACSourceLocation { Inside , Outside }

enum	CoolingSystemType { Water , Air }

enum	CellFanType { AxialFan , CentrifugalFan }

enum	TowerSizedBy { Tonnage , Fan_HP , Unknown }

enum	ChillerCompressorType { Centrifugal , Screw , Reciprocating }

enum	FanMotorSpeedType { One , Two , Variable }

Public Member Functions
	ProcessCooling (const vector< int > &systemOperationAnnualHours, const vector< double > &weatherDryBulbHourlyTemp, const vector< double > &weatherWetBulbHourlyTemp, const vector< ChillerInput > &chillerInputList, const TowerInput &towerInput, const WaterCooledSystemInput &waterCooledSystemInput)

	ProcessCooling (const vector< int > &systemOperationAnnualHours, const vector< double > &weatherDryBulbHourlyTemp, const vector< double > &weatherWetBulbHourlyTemp, const vector< ChillerInput > &chillerInputList, const AirCooledSystemInput &airCooledSystemInput)

TowerOutput	calculateTowerEnergy ()

ChillerOutput	calculateChillerEnergy ()

ChillerPumpingEnergyOutput	calculatePumpEnergy (PumpInput pump) const

vector< double >	getChillerEfficiencyCoeffs (int chillerIndex) const

vector< double >	getChillerEnergyEfficiency (int chillerIndex, const vector< double > &loadAtPercent) const

Static Public Member Functions
static vector< int >	getSysOpAnnualHours (const vector< int > &weeklyOpStartHour, const vector< int > &weeklyOpStopHour, const vector< int > &monthlyOpMaxHour)

Private Member Functions
	ProcessCooling (const vector< int > &systemOperationAnnualHours, const vector< double > &weatherDryBulbHourlyTemp, const vector< double > &weatherWetBulbHourlyTemp, const vector< ChillerInput > &chillerInputList, const AirCooledSystemInput &airCooledSystemInput, const TowerInput &towerInput, const WaterCooledSystemInput &waterCooledSystemInput)

int	getChillerCapacityIndex (ChillerCompressorType chillerType, double capacity) const

double	getChillerEffAtLoad (int c, double load, bool isFullLoadEffKnown) const

void	annualChillerLoadProfile ()

void	annualChillerEfficiencyProfileARI ()

void	annualChillerEfficiencyProfile ()

void	annualChillerPowerProfile ()

void	setTowerFanHPTonnage ()

double	getPercentFanPower (double wetBulbTemp, double percentWaterFlow, double range, double desiredApproach, int yearHourIndex)

double	getPercentWaterFlow (int yearHourIndex) const

double	getRange (int yearHourIndex) const

double	getApproach (double wetBulbTemp) const

double	modifyPercentFanPower (double percentFanPower) const

double	getWeightedAverageChillerLoad (int yearHourIndex) const

double	getChillerTonnageTotal () const

Static Private Member Functions
static double	getCubeRoot (double number)

static double	getPumpHP (double power)

Private Attributes
vector< int >	systemOperationAnnual

vector< double >	dryBulbHourlyTemp

vector< double >	wetBulbHourlyTemp

TowerInput	tower {}

WaterCooledSystemInput	waterCooledSystem

AirCooledSystemInput	airCooledSystem

CoolingSystemType	coolingType

double	FCTemp = 0

vector< double >	CWTHourly

int	numChillers

vector< ChillerInput >	chillers

vector< vector< double > >	chillerHourlyLoad

vector< vector< double > >	chillerHourlyLoadOperational

vector< vector< double > >	chillerEfficiencyCoeffs

vector< vector< double > >	chillerHourlyEfficiencyARI

vector< vector< double > >	chillerHourlyEfficiency

vector< vector< double > >	chillerHourlyPower

Detailed Description

Definition at line 49 of file process_cooling.h.

Member Enumeration Documentation

◆ ACSourceLocation

enum ProcessCooling::ACSourceLocation

Definition at line 53 of file process_cooling.h.

◆ CellFanType

enum ProcessCooling::CellFanType

Definition at line 57 of file process_cooling.h.

◆ ChillerCompressorType

enum ProcessCooling::ChillerCompressorType

Definition at line 61 of file process_cooling.h.

◆ CoolingSystemType

enum ProcessCooling::CoolingSystemType

Definition at line 55 of file process_cooling.h.

◆ FanMotorSpeedType

enum ProcessCooling::FanMotorSpeedType

Definition at line 63 of file process_cooling.h.

◆ RefrigerantType

enum ProcessCooling::RefrigerantType

Definition at line 51 of file process_cooling.h.

◆ TowerSizedBy

enum ProcessCooling::TowerSizedBy

Definition at line 59 of file process_cooling.h.

Constructor & Destructor Documentation

◆ ProcessCooling() [1/2]

ProcessCooling::ProcessCooling	(	const vector< int > &	systemOperationAnnualHours,
		const vector< double > &	weatherDryBulbHourlyTemp,
		const vector< double > &	weatherWetBulbHourlyTemp,
		const vector< ChillerInput > &	chillerInputList,
		const TowerInput &	towerInput,
		const WaterCooledSystemInput &	waterCooledSystemInput
	)

inline

Use this constructor for water cooling system

Parameters

systemOperationAnnualHours	integer array of 8760 hours of the year with values as 0 or 1
weatherDryBulbHourlyTemp	double, @unit{\F}, array of 8760 hours of the year with dry bulb hourly recorded temperature
weatherWetBulbHourlyTemp	double, @unit{\F}, array of 8760 hours of the year with wet bulb hourly recorded temperature
chillerInputList	ChillerInput array
towerInput	TowerInput
waterCooledSystemInput	WaterCooledSystemInput

Definition at line 506 of file process_cooling.h.

◆ ProcessCooling() [2/2]

ProcessCooling::ProcessCooling	(	const vector< int > &	systemOperationAnnualHours,
		const vector< double > &	weatherDryBulbHourlyTemp,
		const vector< double > &	weatherWetBulbHourlyTemp,
		const vector< ChillerInput > &	chillerInputList,
		const AirCooledSystemInput &	airCooledSystemInput
	)

inline

Use this constructor for air cooled system

Parameters

systemOperationAnnualHours	integer array of 8760 hours of the year with values as 0 or 1
weatherDryBulbHourlyTemp	double array of 8760 hours of the year with dry bulb hourly recorded temperature
weatherWetBulbHourlyTemp	double array of 8760 hours of the year with wet bulb hourly recorded temperature
chillerInputList	ChillerInput array
airCooledSystemInput	AirCooledSystemInput

Definition at line 523 of file process_cooling.h.

Member Function Documentation

◆ calculateChillerEnergy()

ChillerOutput ProcessCooling::calculateChillerEnergy ( )

Returns: ChillerOutput

◆ calculatePumpEnergy()

ChillerPumpingEnergyOutput ProcessCooling::calculatePumpEnergy ( PumpInput pump ) const

Parameters

pump PumpInput

Returns: ChillerPumpingEnergyOutput

◆ calculateTowerEnergy()

TowerOutput ProcessCooling::calculateTowerEnergy ( )

Returns: TowerOutput

◆ getChillerEfficiencyCoeffs()

vector< double > ProcessCooling::getChillerEfficiencyCoeffs ( int chillerIndex ) const

Parameters

chillerIndex integer, zero based index of chiller from the chillers input provided

Returns: an array of coefficients 4 for 3rd degree polynomial(for FullLoadEffKnown or custom chiller) or 7 for 5th degree polynomial

◆ getChillerEnergyEfficiency()

vector< double > ProcessCooling::getChillerEnergyEfficiency	(	int	chillerIndex,
		const vector< double > &	loadAtPercent
	)		const

Parameters

chillerIndex	integer, zero based index of chiller from the chillers input provided
loadAtPercent	double array, % loading, between 0 and 100, can be either ascending or descending or in any order

Returns: an array of energy efficiency values for % loads, corresponding to the same order of input loadAtPercent array

◆ getSysOpAnnualHours()

static vector< int > ProcessCooling::getSysOpAnnualHours	(	const vector< int > &	weeklyOpStartHour,
		const vector< int > &	weeklyOpStopHour,
		const vector< int > &	monthlyOpMaxHour
	)

static

Use this method to generate system operation annual hours from weekly schedules and monthly max operation hours

Parameters

weeklyOpStartHour	integer array of 7 with hours of the day of the week with start hour of operation (0-23)
weeklyOpStopHour	integer array of 7 with hours of the day of the week with stop hour of operation (0-24)
monthlyOpMaxHour	integer array of 12 with months of the year with max operation hours in that month (0-744) 0 for no operation for that month. If monthlyOpMaxHour exceeds the total hours for a month, it will be capped to the max hours in that month and ending hour for that month will be set to non-operational after the max hours is reached.

Returns: integer array of 8760 hours of the year with values as 0 or 1 set based on weekly and monthly schedules

Member Data Documentation

◆ airCooledSystem

AirCooledSystemInput ProcessCooling::airCooledSystem

private

Definition at line 592 of file process_cooling.h.

◆ chillerEfficiencyCoeffs

vector<vector<double> > ProcessCooling::chillerEfficiencyCoeffs

private

Definition at line 602 of file process_cooling.h.

◆ chillerHourlyEfficiency

vector<vector<double> > ProcessCooling::chillerHourlyEfficiency

private

Definition at line 604 of file process_cooling.h.

◆ chillerHourlyEfficiencyARI

vector<vector<double> > ProcessCooling::chillerHourlyEfficiencyARI

private

Definition at line 603 of file process_cooling.h.

◆ chillerHourlyLoad

vector<vector<double> > ProcessCooling::chillerHourlyLoad

private

Definition at line 600 of file process_cooling.h.

◆ chillerHourlyLoadOperational

vector<vector<double> > ProcessCooling::chillerHourlyLoadOperational

private

Definition at line 601 of file process_cooling.h.

◆ chillerHourlyPower

vector<vector<double> > ProcessCooling::chillerHourlyPower

private

Definition at line 605 of file process_cooling.h.

◆ chillers

vector<ChillerInput> ProcessCooling::chillers

private

Definition at line 599 of file process_cooling.h.

◆ coolingType

CoolingSystemType ProcessCooling::coolingType

private

Definition at line 593 of file process_cooling.h.

◆ CWTHourly

vector<double> ProcessCooling::CWTHourly

private

Definition at line 596 of file process_cooling.h.

◆ dryBulbHourlyTemp

vector<double> ProcessCooling::dryBulbHourlyTemp

private

Definition at line 587 of file process_cooling.h.

◆ FCTemp

double ProcessCooling::FCTemp = 0

private

Definition at line 595 of file process_cooling.h.

◆ numChillers

int ProcessCooling::numChillers

private

Definition at line 598 of file process_cooling.h.

◆ systemOperationAnnual

vector<int> ProcessCooling::systemOperationAnnual

private

Definition at line 586 of file process_cooling.h.

◆ tower

TowerInput ProcessCooling::tower {}

private

Definition at line 590 of file process_cooling.h.

◆ waterCooledSystem

WaterCooledSystemInput ProcessCooling::waterCooledSystem

private

Definition at line 591 of file process_cooling.h.

◆ wetBulbHourlyTemp

vector<double> ProcessCooling::wetBulbHourlyTemp

private

Definition at line 588 of file process_cooling.h.

The documentation for this class was generated from the following file:

include/processCooling/process_cooling.h

Classes

Public Types

Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Member Functions

Private Attributes

Detailed Description

Member Enumeration Documentation

◆ ACSourceLocation

◆ CellFanType

◆ ChillerCompressorType

◆ CoolingSystemType

◆ FanMotorSpeedType

◆ RefrigerantType

◆ TowerSizedBy

Constructor & Destructor Documentation

◆ ProcessCooling() [1/2]

◆ ProcessCooling() [2/2]

Member Function Documentation

◆ calculateChillerEnergy()

◆ calculatePumpEnergy()

◆ calculateTowerEnergy()

◆ getChillerEfficiencyCoeffs()

◆ getChillerEnergyEfficiency()

◆ getSysOpAnnualHours()

Member Data Documentation

◆ airCooledSystem

◆ chillerEfficiencyCoeffs

◆ chillerHourlyEfficiency

◆ chillerHourlyEfficiencyARI

◆ chillerHourlyLoad

◆ chillerHourlyLoadOperational

◆ chillerHourlyPower

◆ chillers

◆ coolingType

◆ CWTHourly

◆ dryBulbHourlyTemp

◆ FCTemp

◆ numChillers

◆ systemOperationAnnual

◆ tower

◆ waterCooledSystem

◆ wetBulbHourlyTemp