optimization strategy in energy saving of chiller plant systems · 2008-11-19 · confidential &...

Confidential & ProprietaryConfidential & Proprietary 益美科技益美科技 EPS Group, Inc.EPS Group, 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

Flow RatioFlow Ratio 1.0 0.9 0.8 0.7 0.6 0.5

Power RatioPower Ratio 1.000 0.729 0.512 0.343 0.216 0.125

Power Saving % 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

節能1002 Total KW = 1920

節能1002

非節能1003 Total KW = 2209

非節能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

optimization strategy in energy saving of chiller plant systems · 2008-11-19 · confidential &...

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