Improving Energy Efficiency & Reducing Maintenance...
Transcript of Improving Energy Efficiency & Reducing Maintenance...
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?