Technology I
Sub-Metering 101
Submetering 101
What Federal Facility Managers Need To Know
Presented by
Steve Kearney – E-Mon
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Metering vs. Submetering
• What is submetering?
– Defined as a metering device installed after the main
utility meter
 Used for capturing facility energy data at a specific
location, panel, circuit or user.
– Delivers granularity of facility energy performance data
Submeters –The critical component for accessing facility
energy related data
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Overview: Electro-Mechanical Meter
•
The Electro-Mechanical Meters
– Typical Utility type Meter
– Available in various amperages
– Power passes through meter, then to
distribution panel
•
– Requires substantial physical space for
installation
One meter per building
– Restricted ability to sell multiple meters per
customer site
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Overview: Sensor-Based Submeters
• Non-Socket, Current Sensor Based Technology
– Limited or no Power interruption
– Lower installed cost
No CT Cabinets
No Meter Socket
Reduced cabling and conduit
– 1/10 the time to install
– Space saving and flexibility in location
• Multiple submeters per location
increases revenue stream
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BENEFITS OF SUBMETERING.
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Accurate energy monitoring.
Ease and flexibility of installation.
Concise energy management tool.
Promotes energy savings.
Positive environmental impact.
Automatic Meter Reading capable.
Provides T.O.U. graphs and charts.
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ACCURATE ENERGY MONITORING
Electronic submetering equipment
meets or exceeds *ANSI C12
national accuracy standards.
*American National Standards Institute
•
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EASE AND FLEXIBILITY OF
INSTALLATION
• Metering installs in practically any available space.
• Any size circuit from main distribution to a single 15
amp branch can be monitored..
• No changes to building wiring required..
• Using split-core current sensors will allow installation
without disconnecting cables.
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Energy Management
• Submetering easily ties into
Building/Energy management
equipment.
• Detailed energy data gives system
maximum control over energy usage,
etc.
• Remote monitoring by Automatic
Meter Reading system acts as
“watchdog” to keep an eye on
performance
• Maximum control = Maximum
savings
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PROMOTES ENERGY SAVINGS
 (Benchmarking) Accurate knowledge of
where energy is being consumed is the first
step in creating a savings program.
 (Continuous Commissioning) Constant
monitoring allows the user to gauge the
results of an energy savings program.
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Positive Environmental Impact
• Better efficiency delays need for new generating
facilities. (costs stay lower)
• Lower pollution provides environmentally friendly
image..
Each kilowatt-hour of electrical energy
saved reduces pollution by:
F 1.37 lbs. carbon dioxide (CO2)
F 5.8 grams sulphur dioxide (SO2)
F 2.5 grams nitrous oxides (NOx)
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AUTOMATIC METER READING
• Allows reading of meters at any time, day or night.
• Allows meter reading in all weather conditions.
• Allows reading of meters anywhere in the world from
your computer.
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PROVIDES “TIME-OF-USE” GRAPHS AND CHARTS
• Data for “real-time”
pricing of energy.
• Data for event analysis.
• Data for Demand Side
Management programs.
• Data for energy
program planning and
performance analysis.
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Electronic kWh Meter Installation
1.
Mount meter at desired
location
2.
Connect voltage inputs –
fuse/provide disconnect
according to code
3.
Install split-core current
sensors
4.
1
3
2
Power up meter
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EPACT 2005 Overview
• Energy Policy Act of 2005
• Signed into law by Pres. Bush 8/05
• Extended to 12/31/13
• May be extended further
• Key Provisions
– Required all Federal buildings to be metered or submetered
– Federal building energy-efficiency standards
– Tax deduction for energy-efficient buildings
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Federal Buildings Efficiency
•
500,000+ Federal buildings
•
Section 102 - Sets efficiency goals for existing buildings to increase 2% per
year to 20% by 2015
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Section 105 - Extends energy savings performance program to 2016
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Section 109 - New buildings must comply with ASHRAE 90.1 – 2004
• Goal of 30% below 2004 standards
• Apply sustainable design principles
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The LEED Rating System
Leadership in Energy & Environmental Design:
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Sustainable Sites
Water Efficiency
Energy & Atmosphere
Material & Resource
Indoor Environmental Quality
Innovation & Design Process
LEED Certification Levels:
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Certified
Silver
Gold
Platinum
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Metering Credits
• Measurement & Verification – EA Credit 5
– use meters for base building, tenant submetering and energy system
performance
• Building Operations & Maintenance – EA Credit 3.3
– use meters and software system to educate staff, continuously track
performance and optimize systems
• Performance Measurement – EA Credit 5.1 - 5.3
– enhanced metering-use electric, water and gas meters and software system
for ongoing accountability and optimization of building energy
performance over time
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Metering Credits (2)
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Documenting Sustainable Building Cost – EA Credit 6
– Use Submetering Software to document overall build operating costs to identify any
positive impacts relative to sustainable performance improvements
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Optimize Energy Performance – EA Credit 1
– Verify that energy efficiency equipment and system are operating at peak performance
and as specified in the building design
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Energy Use, Measurement & Payment Accountability – EA Credit 3
– Provide for the ongoing accountability and optimization of tenant energy and water
consumption including submetering equipment to measure and record energy uses within
the tenant space
– Negotiate a lease where energy costs are paid by the tenant and not included in the base
rent
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Hawthorne Effect
Mandalay Condos
 Yearly usage in
millions of kWh.
 Submetering added in
July of 1995.
 Changes due to
tenant awareness.
 450,000 kWh saved.
 675,000 lb. less CO2 in
atmosphere.
Yearly Consumption X 1,000,000
4.7
4.6
4.5
4.4
4.3
kWh
4.2
4.1
4
3.9
'92 '93 '94 '95
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Proactive
Virginia Power
Corporate Hq. & Innsbrook Tech. Ctr.
Changes made after submetering analysis.
Demand reduction: 720 kW
Energy Savings: 4,862,000 kWh/year
Pollution Savings:
6,660,940 lbs. CO2
62,168 lbs. SO2
26,797 lbs. NOx
Cost Savings:
$343,000
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Pollution Saved
 CO2 REDUCTION AT VIRGINIA POWER
IS ENOUGH TO FILL A TRAIN OF
BOXCARS ALMOST 110 MILES LONG
BY VOLUME. (13,527 BOXCARS)
--
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L.A. Air Force Base
• Identify energy saving
opportunities
• Verification of savings
• Energy budgeting
• Comply with energy
reduction mandates
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L.A. Air Force Base Hardware
• Over 50 submeters
• 21 interval data
accumulators
• Energy intelligence
software
• Est. Cost $50k
• Used to verify over $1
million in savings
• Won FEMP award for
savings
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Sustainability
The practice of creating and using
more resource efficient models of
construction, renovation,
operation, maintenance, and
demolition.
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Three Major Components of
Energy Usage
1.) HVAC
2.) Lighting
3.) Receptacle Loads
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Three Major Components Breakdown
RED= HVAC
BLUE= Lighting
Green= Receptacle
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For more information visit our booth at the Energy
2013 show or visit www.emon.com
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