Improving Energy Efficiency & Reducing Maintenance Costs

Getting the most from your

energy management system

John WallaceEmerson Climate Technologies Retail Solutions

Discussion Topics

Introduction

to an EMS

Focus on

Energy

Getting Your

Money’s

Worth

And Beyond:

What’s

Next?

What Is

an EMS?

Techniques

to Reduce

Energy

Consumption

Using All the

Capabilities

in State-of-

the-Art

Systems

What’s Driving

Next

Generation

Systems

Development?

“Islands of Control” Integrated to Forma Complete Energy Management System

• Individual Systems Tied Together

• Information Sharing Across

Systems

• Emergence of “Supervisory

Functions”

• Integration/Control Maturity Similar

to Auto Industry Evolution

– Communication Technologies

– More Sensors

– Smarter Control

– Use Data to Drive Actions

Supervisory

System

HVAC

LightingREF

Other

Connecting the “Islands” Into an EMS

Layers and Functions of an EMS

•Remote User Interface

•Site Information

•Data Feed

Key Elements

•On-site User Interface

•User Management

•Data Logging

•Alarming

•Cross-system Coordination

•Control Algorithms

• Inputs & Outputs

•Sensors & Transducers

•Equipment Interface

Integration of Third Party Equipment Leverages

EMS Functionality to Provide Control & Information

Benefits• Common User Interface Across Site

• Remote Access

• Normalized Information (Alarms, Logs, etc.) Using EMS Infrastructure

• Operational Visibility

53%

6%

41%

HVAC REFR OTHER

70%

27%

3%

ECHELON MODBUS BACNET

BY PROTOCOLBY TYPE

Third Party Device Statistics

Note: Statistics based on Emerson’s E2 support (113 devices)

< 1yr

> 4 yr

< 2 yr

EMS Supports Different Control Architectures

Installation Costs Similar Across Architectures

Case Control Architecture Simplifies Electrical & Refrigeration Installation

Centralized Control Case Control

• Control Elements at Refrigeration

Rack or Electrical Panel

• “Home Runs” for Sensors

• Separate Electrical Circuits for Loads

• Control Elements at Case

• Communication “Daisy Chain”

to Supervisory System

• Load Control at Refrigeration Case

Case Control Architecture Reduces Field Wiring and Provides Electrical Savings

• Reduce Line Voltage Wiring

– Reduce Branch Feeder Wiring by 30% or More

– Reduce or Eliminate Circuit Panels and Breakers

– Reduce Branch Feeder Distance: Distributed Design

– Eliminate Line Voltage Control Home Runs to Rack

– Simplified Power Connections at Case

• Reduce Low Voltage Wiring

– Eliminate Low Voltage Control Home Runs to Rack

– Simplified Low Voltage Control Connections at Case

• Reduce Case Field Wiring

– OEM Factory Wiring of Control and Sensors

– Facilitates Factory Checkout Versus Field Troubleshooting

Utilizing Case Controls Reduces Energy & Maintenance Costs

• Reduce Maintenance Costs

– Additional Sensors Enable Remote

Diagnostics and Facilitate Faster and

More Reliable Troubleshooting

– No Seasonal Expansion Valve/EPR/

Temperature Adjustments

• Use Technology to Supplement

Technicians

• Reduce Energy Used at the

Evaporator

– Precise Control Eliminates

Mechanical Valve “Parasitic

Losses”

– Optimized Valve Control Ensures

Refrigeration System Operating

at Peak Efficiency

• Reduce Energy Used at the

Rack

– Electronic Valve Facilitates Much

Lower Condensing Pressures

– Approximately 1% of

Compressor Energy Savings per

2 psig Increase in Suction

Call Center

Diagnoses

Condition

Relevant

Information

Provided to Tech

Store

Equipment

Provides

Data

Remote Troubleshooting

Discussion Topics

Introduction

to an EMS

Focus on

Energy

Getting Your

Money’s

Worth

And Beyond:

What’s

Next?

What Is

an EMS?

Techniques

to Reduce

Energy

Consumption

Using All the

Capabilities

in State-of-

the-Art

Systems

What’s Driving

Next

Generation

Systems

Development?

Energy Management & Maintenance Are

Keys to Operational Excellence and Profitability

Source: FMI 2000 Supermarket Study Referenced by allbusiness.com

The Four Stages of Energy Reduction

Energy Reduction Is a Continuous Process

Utilize EMS to Limit Peak Demand

kW

Time

Application Typical Shed Action

HVAC Applications Raise Cooling Setpoints, Lower Heating Setpoints

Sensor Control Raise or Lower Cut in/Cut Out

Lighting Stage Circuits Off

Time

Shed

Setpoint

Demand Without Shed Demand With Shed

Advanced Shed Algorithms (i.e., Rotational Shed) Allow Strategies

Such as “Comfort First” to Minimize Disruptions

Peak Sets Demand

Charges

• EMS Monitors

Demand

• As Demand Approaches

Preset Level, EMS

Sheds Loads

“Watching” Energy Management Settings

Regularly Will Prevent Energy Leakage

Energy

Management

Systems

HVAC/R/L

Equipment

Technician

On-site to Fix

a Problem

Changes Made

to EMS Settings

Impact on

Operational

Performance

Check to Find

“Band-Aids”

Left in Place

Impact Energy

Usage

Periodic Analysis Required to Ensure System

Optimizations Not Compromised

Common EMS Issues That CanImpact Energy Usage

• Fixture Settings

– Check Case Temp Setpoints to Ensure Proper Settings

• Sensor Offsets

– Ensure Temperature Sensors Are Not Offset, Masking a Problem

• Check Proper Operation of Liquid Level Sensors

– Low Refrigerant Levels Increase Energy Usage

• Humidity Sensors Affect HVAC & ASW Algorithms

– Check to Ensure Correct Operation

• Lighting Schedules and Overrides

– Ensure Lighting Schedules Are Set Properly and No Overrides Are Present

• Light Level Sensors Operational

– Failed Sensors Could “Fail Over” to Schedules

• Ensure There Are No Overlapping Defrost Schedules

Implement Floating Suction Pressure

Control to Continuously Optimize Operation

Refrigeration

Rack

Circuit 1

EMS

Suction Pressure

Setpoint Fixed

Fixed Strategy

Refrigeration

Rack

Circuit 1

Suction Pressure

Setpoint Variable

Floating Strategy

Temp Feedback

• Fixed Strategy Holds Suction Pressure Setpoint, Regardless of Load

• Floating Strategy Uses Feedback Loop to Change Pressure Setpoint

Based on Load Requirements

• Typically No Additional Hardware Required to Enable

Use Floating Suction Setpoint to Ensure

ESR Control Continually Optimized

Optimized to Keep at Least One Valve Completely Open Based on Load

Floating Head Pressure Optimizes Condenser

Operation Based on Ambient (TD)

• TD (Ambient Following) Optimizes Condenser Control Based on

Ambient Temperature

• Target Condensing Temperature Set to Ambient Temperature With

a Fixed Offset

• Fans Cycled to Maintain Target Temperature With Appropriate

Overrides

• Can Be Combined With Variable Speed Control Fans to Increase

Efficiency

• Studies Show Potential to Save Approximately 7% (Total

Refrigeration Power) to 13% (With VSDs), Depending on Location

Discussion Topics

Introduction

to an EMS

Focus on

Energy

Getting Your

Money’s

Worth

And Beyond:

What’s

Next?

What Is

an EMS?

Techniques

to Reduce

Energy

Consumption

Using All

The

Capabilities

in State-of-

the-Art

Systems

What’s Driving

Next

Generation

Systems

Development?

EMS Provides Operational Visibility Utilizing Control Data

Data Correlated to Show

Top 10 Sites Generating

Alarms Across Enterprise

Alarm Drilldown Shows

Problem Area at Site

EMS Generates

Alarm Data

Technician

Dispatched

to Address

Problem

1

2

3

4

Use EMS Alarm Information toPrioritize Maintenance Activities

Use the EMS to Simplify Food Safety Initiatives

EMS

Installed Today

Inspectors

AND Provide Information

for Multiple Functions

Food Safety Managers

Store Managers

Data Servers

Refrigeration Control Systems

Monitor & Control Food

Temperature

Temperature

Logs

• Process Improvement

• Regulatory Compliance

• Problem Identification

Discussion Topics

Introduction

to an EMS

Focus on

Energy

Getting Your

Money’s

Worth

And Beyond:

What’s

Next?

What Is

an EMS?

Techniques

to Reduce

Energy

Consumption

Using All the

Capabilities

in State-of-

the-Art

Systems

What’s Driving

Next

Generation

Systems

Development?

Ten Trends in Smart Buildings

1. Building Energy Management Hits the Cloud

2. Co-opetition Is on the Rise in the Building Industry

3. Targeted Acquisitions Help Key Players Deliver

Energy Services

4. Demand for Smart Building Products Will Soar (China)

5. U.S. Energy Companies (ESCOs) Turn to Federal Sector

6. Building Communications Protocols Are Converging

7. Demand Response Is Shifting Into Automatic

8. Submeters Find New Opportunities in Smarter Buildings

9. Building Information Modeling (BIM) Is Transforming

the Design Process

10. The Interface Between Smart Building and the Smart

Grid Is Blurring

From Pike Research

Report, 2012

Trends Drive Innovation in Four Key Areas

User Interface & Usability Integration

Cloud Connectivity Extensibility & “Apps”

The Web and Apps Set the Bar

• “IT Friendly” & IOT Will Be the Rule

• Top Level Sub-system Integration

Will Drive Interoperability

• Wireless Technology Will Drive

Installation Costs Down (Especially

for Retrofits)

• Seamless Data Storage

• Provisioning & Controller

Management Automate

Many Tasks

• Enables Enterprise

Analytics & “Big Data”

1 2

3 4

Thank You!

DISCLAIMER

Although all statements and information contained herein are believed to be accurate and reliable, they are presented without guarantee or

warranty of any kind, expressed or implied. Information provided herein does not relieve the user from the responsibility of carrying out its

own tests and experiments, and the user assumes all risks and liability for use of the information and results obtained. Statements or

suggestions concerning the use of materials and processes are made without representation or warranty that any such use is free of patent

infringement and are not recommendations to infringe on any patents. The user should not assume that all toxicity data and safety measures

are indicated herein or that other measures may not be required.

Questions?