Optimization Strategy in Energy Saving of Chiller Plant … · benefit through chiller plant energy saving, while – Meet all demands at all times – Preserve system-wide safety

Confidential&ProprietaryConfidential&Proprietary EPSGroup,Inc.EPSGroup,Inc.1

Optimization Strategy in Optimization Strategy in Energy Saving of Energy Saving of

Chiller Plant SystemsChiller Plant Systems


Objectives Objectives EPSS Energy OptimizerEPSS Energy Optimizer Deliver attractive, on-going economical

benefit through chiller plant energy saving, while Meet all demands at all times Preserve system-wide safety and integrity Improve day-to-day operation efficiency Impose no impact to install & maintain


What is EPSSWhat is EPSS EPSS is a patented and proven energy

saving solution for industrial and commercial chiller plant cooling applications

Product highlights Patented optimization strategy Unique system-based approach Proven track record of significant economical benefits Modular system design & layout Safe & easy to install & maintain Flexible to deploy & operate Eco-friendly


Chiller Plant OverviewChiller Plant Overview


Chiller Plant CyclesChiller Plant Cycles


Traditional Chiller PlantTraditional Chiller Plant

Subsystems Control Energy SavingCooling Tower Cooling Tower SubsystemSubsystem

Constant-speedcooling tower fans

Cooling Water Cooling Water SubsystemSubsystem

Constant-speed cooling water pumps

Chiller SubsystemChiller Subsystem Inlet guide vane load control

Primary Chilled Primary Chilled Water SubsystemWater Subsystem

Constant-speed chilled water pumps

Secondary Chilled Secondary Chilled Water SubsystemWater Subsystem

Variable-speed differential pressure control


Energy Saving in Pumps/FansEnergy Saving in Pumps/Fans Pump/Fan Characteristics

FlowRatioFlowRatio 1.0 0.9 0.8 0.7 0.6 0.5

PowerRatioPowerRatio 1.000 0.729 0.512 0.343 0.216 0.125

PowerSaving% 0.0% 27.1% 48.8% 65.7% 78.4% 87.5%

where KWi : Kilo Watts; and Qi : Flow

Energy saving Golden Opportunity via VFD C/T fans, CW pumps, CH pumps Now, the million dollar question: How exactly?

KW2KW1

=Q2Q1

3


EPSS EPSS Optimized Chiller PlantOptimized Chiller PlantSubsystemsSubsystems EPSS ModuleEPSS Module EPSS OptimizationEPSS Optimization

Cooling Tower Cooling Tower SubsystemSubsystem

Wet bulb temperature sensor VFD for cooling tower fans

VariableVariable--speed speed according to according to OA Enthalpy and optimization OA Enthalpy and optimization strategystrategy

Cooling Water Cooling Water SubsystemSubsystem

Condenser water temperature sensors

VFD for condenser water pumps CWP

VariableVariable--speedspeed according to according to load and optimization load and optimization strategystrategy

Chiller SubsystemChiller Subsystem No modification required other than proper chiller operating condition

As isNo change in chiller control & operating procedure

Primary Chilled Primary Chilled Water SubsystemWater Subsystem

Chilled water decouple line flow meter

VFD for chilled water pumps CHP

VariableVariable--speedspeed according to according to load and optimization load and optimization strategystrategy

Secondary Chilled Secondary Chilled Water SubsystemWater Subsystem

No modification required As isNo change in SCHP control

Monitoring & Monitoring & Control SubsystemControl Subsystem

EPSS Control & Optimization System (ECOP)

Control platform & optimization strategy


99

EPSS EPSS Chiller Plant Chiller Plant ptimizationptimization


EPSSEPSS CWP OptimizationCWP OptimizationFixed ECWT & Fixed % Load

Total KW = Chiller KW + CWP KW


CWP OptimizationCWP OptimizationFixed ECWT & Varying % Load


Optimization Cost FunctionsOptimization Cost Functions

ECWT1 ECWT2 ECWT3

ECWT6ECWT5ECWT4

Varying ECWT & Varying % Load


Optimization StrategyOptimization Strategy Unique System Approach Total Cost Function

( )

( ) ( ) ( ) ( )tKWtKWtKWtKW

LoadWBTtKWKW

ChillerCHPCWPTCt

tTotal

+++=

=

/

%,,

System-Based Constrained Optimization

LoadandWBTgivenatTandTforvalueslowandhighoptimaltheareTandTwhere

TTTTTT

KW

LL

LL

HILLL

LLLOLTotal

MMMMMMMMM

HICHPCHPLOCHPHIGGLOGHILLLOL

%:

21

*2

*1

22*2

*111min


US Patent No.: 6446448US Patent No.: 6446448


System Architecture System Architecture -- EPSSEPSS

DecoupleLine

Flow Sensors

CondenserWater

TemperatureSensors

System Panel

VFDPanels

Ethernet

ChilledWater

TemperatureSensors

WBT Sensor


LLXXXX EPSSEPSS InstallationInstallation

System panelSystem panel VFD panels for CHPVFD panels for CHP

VFD panels for CWPVFD panels for CWP

VFD panels for CTFVFD panels for CTF


LLXXXX M&V SummaryM&V Summary Verification: Validate real-time long-term performance


DDXXXX Chiller PlantChiller Plant


DDXXXX System LayoutSystem Layout


DDXXXX EPSS EPSS InstallationInstallation


DDXXXX M&V SummaryM&V Summary

1002 Total KW = 1920

1002

1003 Total KW = 2209

1003


Product HighlightsProduct Highlights Patented optimization strategy Unique system-based approach Proven track record of significant economical

benefits Modular system design & layout Safe & easy to install & maintain Flexible to deploy & operate Eco-friendly


SummarySummary We are your best partner to work with you on

chiller plant energy saving and provide you with an optimum solution that Best match your application; Meet your goals on energy saving policy; Minimize energy consumption; Realize on-going economical benefit; and Reduce environment impact.

Objectives EPSS Energy OptimizerWhat is EPSSChiller Plant OverviewChiller Plant CyclesTraditional Chiller PlantEnergy Saving in Pumps/FansEPSS Optimized Chiller PlantEPSS Chiller Plant ptimizationEPSS CWP OptimizationCWP OptimizationOptimization Cost FunctionsOptimization StrategyUS Patent No.: 6446448System Architecture - EPSSLXX EPSS InstallationLXX M&V SummaryDXX Chiller PlantDXX System LayoutDXX EPSS InstallationDXX M&V SummaryProduct HighlightsSummary

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Optimization Strategy in Energy Saving of Chiller Plant … · benefit through chiller plant energy saving, while – Meet all demands at all times – Preserve system-wide safety