effectively managing building energy with...
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U.S. GREEN BUILDING COUNCIL G325
Effectively Managing Building
Energy with MeasurementUSGBCNYU_BEM
Carina Paton, Hugh Henderson31 March 2017
Credit(s) earned on completion of
this course will be reported to AIA
CES for AIA members.
Certificates of Completion for both
AIA members and non-AIA
members are available upon
request.
This course is registered with AIA
CES for continuing professional
education. As such, it does not
include content that may be
deemed or construed to be an
approval or endorsement by the
AIA of any material of
construction or any method or
manner of
handling, using, distributing, or
dealing in any material or product.___________________________________________
Questions related to specific materials, methods,
and services will be addressed at the conclusion
of this presentation.
Historically, and in many cases even still today, the only information we use to manage
building energy performance is monthly utility bills. While this data can be used in metrics
for overall building performance, it is not able to shed light on reasons for higher energy
use.
More recently, building managers have begun collecting more detailed measured data:
with more measurement points, and more often. Analyzing this data in an intelligent way
can shed light on certain aspects of our building operations that can be improved upon—
saving money that can then be used for further improvements.
This session will cover:
• What types of data we can collect and how to decide what is worthwhile measuring,
• Recent advancements in monitoring hardware and software, and what this means for
monitoring in your building,
• What you can learn from the data and how it can make your building management
efficient.
Course
Description
Learning
Objectives
1. Explain the value of sub-metering for building management
2. Identify what energy-related data is able to be collected in a building.
3. Decide which data is worthwhile measuring by balancing cost and benefit
4. Select suitable monitoring technology to match a building's equipment,
layout, and requirements.
5. Use analysis from monitored data to make informed operational and new
asset decisions
At the end of the this course, participants will be able to:
Effectively Managing Building
Energy with Measurement: Outline
Knowledgegained from the collected data
Methodsto measure equipment and loads
Benefitsof building energy measurements
NYS Green Building Conference | 31 March 2017 | 5
Cleanest & Cheapest Energy…
negawatt
negathermNYS Green Building Conference | 31 March 2017 | 6
You Can’t Manage What
You Don’t MeasureU
nd
erst
and
Measure current status:
- Energy Use
- Costs
- GHG emissions
Man
age
Identify savings opportunities
Ongoing performance monitoring
Red
uce
Implement energy savings measures
Save:- Energy
- $
- GHG
NYS Green Building Conference | 31 March 2017 | 7
Monitoring Design Considerations
Monitoring Design
Layout
Loads
Energy Inputs
NYS Green Building Conference | 31 March 2017 | 8
What Energy Enters
Your Building?
Energy Inputs
Monitoring Design
Layout
Loads
Energy Inputs
NYS Green Building Conference | 31 March 2017 | 9
Energy Inputs
• Electricity
• Natural Gas
• Steam
Utility Service
• Propane
• Fuel Oil/Diesel
• Biomass
Onsite Fuel
• Steam
• Hot Water
• Chilled Water
Campus Loop
NYS Green Building Conference | 31 March 2017 | 10
Peer Benchmarking
My Building vs. Similar Buildings
Image from https://www.energystar.gov/buildings.
Benchmarking programs
compare data from 100’s to 100,000’s of
buildings.
𝐸𝑛𝑒𝑟𝑔𝑦 𝑈𝑠𝑒 𝐼𝑛𝑡𝑒𝑛𝑠𝑖𝑡𝑦 (𝐸𝑈𝐼) =𝑒𝑛𝑒𝑟𝑔𝑦 𝑢𝑠𝑒
𝑑𝑒𝑓𝑖𝑛𝑖𝑛𝑔 𝑐ℎ𝑎𝑟𝑎𝑐𝑡𝑒𝑟𝑖𝑠𝑡𝑖𝑐
NYS Green Building Conference | 31 March 2017 | 11
Peer Benchmarking
Image: Enerlife, https://www.runnymedehc.ca/files/8314/0413/4749/ECDM_Plan_June_27_2014.pdf.
Individual
Buildings
(ranked by
site energy)
Site Energy Intensity (equivalent kWh/s.f.)
20112013
target
This
facility:
12
Self-Benchmarking:
This Year vs. Last Year
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
AVERAGE NATURAL GAS USE (MCF/DAY)
Last Year
This Year
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Data Disaggregation:
Infer Energy by End-Use
natural gas
baseload
natural gas
heating
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
AVERAGE NATURAL GAS USE (MCF/DAY)
NYS Green Building Conference | 31 March 2017 | 14
Data Disaggregation:
Infer Energy by End-Use
electric
baseload
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
AVERAGE ELECTRICITY USE (KWH/DAY)electric
cooling
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Predictable Heating Loads
with TemperatureRoswell Park Utilities, Daily Utility Meter Data
-20 0 20 40 60 80 100
Outdoor Temperature (F)
0
20
40
60
80
100
120
Ga
s (
MM
Btu
/h)
Weekday
Weekend
Peak at -20 F: 122.2 MMBtu/hBase at 80 F: 19.0 MMBtu/hBalance Point: 30.70 MMBtu/h at 54.5 F
Slope (Left): -1.23 MMBtu/h/FSlope (Right): -0.46 MMBtu/h/F
Gas
(MMBtu/h)55 deg. F
Outdoor Temperature (deg. F) 16
Predictable Cooling Loads
with Temperature and Schedule
Roswell
0 20 40 60 80 100
Outdoor Temperature (F)
0
50
100
150
200
250E
ne
rgy (
MW
h/d
ay)
WeekdayWeekend
Outdoor Temperature (deg. F)
Electricity
(kW)
Roswell Park Utilities, Daily Utility Meter Data
-20 0 20 40 60 80 100
Outdoor Temperature (F)
0
20
40
60
80
100
120
Ga
s (M
MB
tu/h
)
Weekday
Weekend
Peak at -20 F: 122.2 MMBtu/hBase at 80 F: 19.0 MMBtu/hBalance Point: 30.70 MMBtu/h at 54.5 F
Slope (Left): -1.23 MMBtu/h/FSlope (Right): -0.46 MMBtu/h/F
17
Insights on Schedule from
Demand/Load Profiles
Total Building Electrical Demand (kW)
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What energy loads/end-uses
are in your building?Monitoring Design
Layout
Loads
Energy Inputs
NYS Green Building Conference | 31 March 2017 | 19
Commercial Energy by End-Use
Space Heating
Lighting
Space CoolingWater Heating
Ventilation
Refrigeration
Electronics
ComputersCooking
Other
Not Attributable to Specific End-Use
Source: U.S. DOE, Office of Energy Efficiency & Renewable Energy, Buildings Energy Data Book, Site Energy, Table
3.1.4, 2010 Commercial Energy End-Use Splits, by Fuel Type, http://buildingsdatabook.eren.doe.gov. 20
Data Disaggregation for
Virtual/Remote Audit
Source: FirstFuel, http://www.firstfuel.com/solutions/government/NYS Green Building Conference | 31 March 2017 | 21
Limits to Utility Meter
(Whole Building) Data:
• Get a glimpse into what’s happening, but
don’t know why
• If you don’t know why, you don’t know
how to fix it.
Solution: Sub-Meter
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Why Sub-Meter?
• Characterize energy use by
individual equipment or load groups
– How much
– When
• Track energy over time
• Attribute savings to measures
• Collect more than energy
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Where are the loads
in your building?
• (brainstorm/mapping)
Monitoring Design
Layout
Loads
Energy Inputs
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Number and Location
Less Important than Before
• Traditionally, monitor the “lumps”
• Technological advances: easier to monitor
more points and distributed loads
NYS Green Building Conference | 31 March 2017 | 25
Effectively Managing Building
Energy with Measurement: Outline
Knowledgegained from the collected data
Methodsto measure equipment and loads
Benefitsof building energy measurements
NYS Green Building Conference | 31 March 2017 | 26
Unified Data Collection
Power Meter
Flow Meter
ThermistorGas
MeterEnvironmental
Sensor
Data Collection
System
Electricity Thermal Energy (Flow, Temp.) Gas Space Conditions
Flow Meter
Water
CO2
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Data Collection System
• Need system that can
– collect
– store
interval data
• Historic data enables
– data presentation
– data analytics
understand trends
data logger and expansion board
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Data Collection Innovations:
Wireless Transceivers
Room 1 Room 2 Meters
Wireless
Transmitter
Wireless
Transmitter
Meters
Wireless
Receiver Data
Collection
System
Electrical/Mechanical Room
NYS Green Building Conference | 31 March 2017 | 29
Data Collection Innovations:
Wireless Communications
Data
Collection
System
Wi-Fi
Meter
Wi-Fi
Meter
Wi-Fi
Meter
Wi-Fi
Meter
Wi-Fi
Meter
Wi-Fi
Meter
Wi-Fi
Meter
1stF
loor
2n
d
Flo
or
NYS Green Building Conference | 31 March 2017 | 30
Data Collection Innovations:
Combined Approach
Basement Electrical/Mechanical Room 1 Basement Electrical Room 2
Ground Floor
NYS Green Building Conference | 31 March 2017 | 31
What Can We Measure?
We can measure:
– Electrical voltage (V)
– Electrical current (A)
– Fluid flow (gpm, cfm)
– Fluid temperature (°F)
– Air relative humidity (%)
– Air concentrations: CO2, CO, NO2 (ppm)
This tells us:
– Electricity use
– Thermal energy use
– Fuel use
– Water use
– Space conditions
NYS Green Building Conference | 31 March 2017 | 32
Electricity Monitoring
End Use
CTs
VTs
A
VData
LoggerPower Meter
A, V, kW,
kWh, Hz,
ø, etc.
CT: current transducer/transformer
VT: voltage tap/transducer/transformer
A: amps (current)
V: volts (voltage)
kW: kilowatts (power)
kWh: kilowatt-hours (energy)
Hz: Hertz (frequency)
ø: phaseNYS Green Building Conference | 31 March 2017 | 33
Electricity Monitoring Innovations:
Split-Core and Flexible CTs
Split Core CTs Rope CTsNYS Green Building Conference | 31 March 2017 | 34
Electricity Monitoring Innovations:
Multi-Circuit Power Meter
NYS Green Building Conference | 31 March 2017 | 35
Electricity Monitoring Innovations:
Self-Contained Transducers
Fuses
NYS Green Building Conference | 31 March 2017 | 36
Electricity Monitoring Innovations:
Wireless Power Meters
NYS Green Building Conference | 31 March 2017 | 37
Other Electricity Metering
Innovations: Communications
• Displays on meters
• Power quality measurements
• Data output (Modbus/BACnet)
• Data recording within meters
NYS Green Building Conference | 31 March 2017 | 38
Thermal Energy Monitoring
DHW
Space
Flow meter
Thermistor
Direction of flow
Thermal load
Inlet
Outlet
Ti
To
F𝑇ℎ𝑒𝑟𝑚𝑎𝑙 𝐸𝑛𝑒𝑟𝑔𝑦 𝑡𝑜 𝐿𝑜𝑎𝑑 = 𝑓𝑙𝑜𝑤 × ∆𝑇
𝐻 = 𝐹 × (𝑇𝑖 − 𝑇𝑜)
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Measuring Fluid Flow
NYS Green Building Conference | 31 March 2017 | 40
Natural Gas Metering
• Pulse output on
utility meter
• Sub-meters
for specific
end uses
inside facility
Pulser
NYS Green Building Conference | 31 March 2017 | 41
Monitoring Space Conditions
• Temperature
• Relative Humidity
• Carbon Dioxide
• CO, NO2, Etc.
NYS Green Building Conference | 31 March 2017 | 42
How to Select Data Points &
Monitoring Technology?
Value Effort
Time
Labor Cost
Equipment Cost
CO2
Reductions
Incentives
Energy ($) Savings
NYS Green Building Conference | 31 March 2017 | 43
Effectively Managing Building
Energy with Measurement: Outline
Knowledgegained from the collected data
Methodsto measure equipment and loads
Benefitsof building energy measurements
NYS Green Building Conference | 31 March 2017 | 44
Purpose of Data Display and Analysis:
Understand Trends
Understand Trends
Identify Savings Opportunities
Recognize Savings Achieved
Account-ability
NYS Green Building Conference | 31 March 2017 | 45
Data Display: Web Kiosk Presents
Real-Time Whole-System Overview
10-Feb-17 | 46
http://cloud.cdhenergy.com/esf_chp/
Lighting Loads, Large County
Building, Weekday vs. Weekend
NYS Green Building Conference | 31 March 2017 | 47
Whole Panel Power in Hospital
NYS Green Building Conference | 31 March 2017 | 48
Lighting in School
Before/After Retrofit
NYS Green Building Conference | 31 March 2017 | 49
HW, DHW, Chilled Water
Flows in School
NYS Green Building Conference | 31 March 2017 | 50
Generator Efficiency: Combining
Electrical, Thermal, and Gas Data
NYS Green Building Conference | 31 March 2017 | 51
CO2 Concentration Occupancy
at School
NYS Green Building Conference | 31 March 2017 | 52
Space Temperature at School
NYS Green Building Conference | 31 March 2017 | 53
Relative Humidity at School
NYS Green Building Conference | 31 March 2017 | 54
Web Analytics
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Analytic Tools Should:
• Be specific to site
• Be clear and user-friendly
• Give access to raw data
• Ultimately, give useful feedback to
operators/managers
– How, when energy used
– Where energy savings possible
NYS Green Building Conference | 31 March 2017 | 56
Effectively Managing Building
Energy with Measurement: Summary
Knowledgegained from the collected data
Methodsto measure equipment and loads
Benefitsof building energy measurements
NYS Green Building Conference | 31 March 2017 | 57
Effectively Managing Building
Energy with Measurement
• Design Factors:
– Cost vs. benefit
– Inputs, loads, and locations
• Submetering:
– Much information already available with
utility meter data alone
– Submetering can provide deeper insight
NYS Green Building Conference | 31 March 2017 | 58
Effectively Managing Building
Energy with Measurement
• New Innovations Mean:
– We can measure more than before practical
– We can bring all data into a central place
– Data (& web) analytics possible and useful
• Data Analytics Provide Feedback:
– How, when energy used
– Where efficiency improvements possible
NYS Green Building Conference | 31 March 2017 | 59
Contact Us
Carina Paton
Hugh Henderson
www.cdhenergy.com
NYS Green Building Conference | 31 March 2017 | 60
This concludes The American Institute of Architects
Continuing Education Systems Course
U.S. Green Building Council Tracie Hall, Director-
New York Upstate