How to Improve Energy Efficiency & Reduce Maintenance

Transcription

1 How to Improve Energy Efficiency & Reduce Maintenance Getting the most from your energy management system John Wallace Emerson Climate Technologies Retail Solutions

2 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-ofthe-Art Systems What s Driving Next Generation Systems Development?

3 Islands of Control Integrated to Form a 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 REF HVAC Supervisory System Lighting Other Connecting the Islands Into an EMS

4 Layers and Functions of an EMS Key Elements Remote User Interface Site Information Data Feed On-site User Interface User Management Data Logging Alarming Cross-system Coordination Control Algorithms Inputs and Outputs Sensors and Transducers Equipment Interface

5 Integration of Third Party Equipment Leverages EMS Functionality to Provide Control and Information Benefits Common User Interface Across Site Remote Access Normalized Information (Alarms, Logs, etc.) Using EMS Infrastructure Operational Visibility BY TYPE Third Party Device Statistics BY PROTOCOL < 1 yr 3% 41% 53% < 2 yr 27% 70% > 4 yr 6% HVAC REFR OTHER ECHELON MODBUS BACNET Note: Statistics based on Emerson s E2 support (113 devices)

6 EMS Supports Different Control Architectures Installation Costs Similar Across Architectures

7 Case Control Architecture Simplifies Electrical and 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

8 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

9 Utilizing Case Controls Reduces Energy and Maintenance Costs 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 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 Relevant Information Provided to Tech Call Center Diagnoses Condition Remote Troubleshooting Store Equipment Provides Data

10 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-ofthe-Art Systems What s Driving Next Generation Systems Development?

11 CEC Title 24 Impact On Supermarket Refrigeration Systems Released in 2012 Broader Than CA Refrigeration Impact Floating Head Pressure Floating Suction Pressure Mechanical Subcooling Display Case Lighting Heat Recovery Lighting Impact Automatic Controls

12 Energy Management and Maintenance Are Keys to Operational Excellence and Profitability Source: FMI 2000 supermarket study referenced by allbusiness.com

13 The Four Stages of Energy Reduction Energy Reduction Is a Continuous Process

14 Utilize EMS to Limit Peak Demand Demand Without Shed Demand With Shed kw Peak Sets Demand Charges EMS Monitors Demand As Demand Approaches Preset Level, EMS Sheds Loads Shed Setpoint Time Application HVAC Applications Sensor Control Lighting Time Typical Shed Action Raise Cooling Setpoints, Lower Heating Setpoints Raise or Lower Cut in/cut Out Stage Circuits off Advanced Shed Algorithms (i.e., Rotational Shed) Allow Strategies Such as Comfort First to Minimize Disruptions

15 Watching Energy Management Settings Regularly Will Prevent Energy Leakage Check to Find Band-Aids Left in Place Energy Management Systems HVAC/R/L Equipment Technician On-site to Fix a Problem Changes Made to EMS Settings Impact on Operational Performance Impact Energy Usage Periodic Analysis Required to Ensure System Optimizations Not Compromised

16 Common EMS Issues That Can Impact 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 and 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

17 Implement Floating Suction Pressure Control to Continuously Optimize Operation Suction Pressure Setpoint Fixed Fixed Strategy Refrigeration Rack EMS Suction Pressure Setpoint Variable Floating Strategy Refrigeration Rack Circuit 1 Temp Feedback Circuit 1 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

18 Use Floating Suction Setpoint to Ensure ESR Control Continually Optimized Optimized to Keep at Least One Valve Completely Open Based on Load

19 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

20 Defrost Strategies Can Result in Significant Savings as Well as Other Benefits Normal Timed Defrost On-Demand Defrost Fewer Defrosts Implementation of Demand Defrost Results in 20% Energy Savings Versus Traditional Defrost Methods

21 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-ofthe-Art Systems What s Driving Next Generation Systems Development?

22 EMS Provides Operational Visibility Utilizing Control Data

23 Use EMS Alarm Information to Prioritize Maintenance Activities 4 Technician Dispatched to Address Problem 1 EMS Generates Alarm Data 2 Data Correlated to Show Top 10 Sites Generating Alarms Across Enterprise 3 Alarm Drilldown Shows Problem Area at Site

24 Use the EMS to Simplify Food Safety Initiatives Temperature Logs EMS Inspectors Data Servers Store Managers Food Safety Managers Refrigeration Control Systems Monitor and Control Food Temperature Installed Today AND Provide Information for Multiple Functions Process Improvement Regulatory Compliance Problem Identification

25 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-ofthe-Art Systems What s Driving Next Generation Systems Development?

26 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 Source: Pike Research Report, 2012

27 Trends Drive Innovation in Four Key Areas 1 User Interface and Usability 2 Integration The Web and Apps Set the Bar IT Friendly and IOT Will Be the Rule Top Level Sub-system Integration Will Drive Interoperability Wireless Technology Will Drive Installation Costs Down (Especially for Retrofits) Cloud Connectivity 3 4 Extensibility and Apps Seamless Data Storage Provisioning and Controller Management Automate Many Tasks Enables Enterprise Analytics and Big Data

28 Thank You! Questions? 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.