results from minnesota’s existing building commissioning program
TRANSCRIPT
Chris Plum, Mark Hancock
Center for Energy and Environment
Results from Minnesota’s Existing
Building Commissioning Program
21st National Conference on Building Commissioning
AIA Quality Assurance
The Building Commissioning Association is a Registered Provider with The
American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program 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 program 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.
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Presentation Description
CEE administers the state program to perform existing building
commissioning (EBCx) on state government buildings in
Minnesota.
Investigations of 227 buildings containing nearly 19 million square
feet located on 50 sites throughout the state were performed.
The participation rate in the program is very high, which provides
a useful measure of the potential for broadly implemented EBCx
programs.
Several best practices for program managers were identified.
We included a rigorous quality assurance process which resulted
in a number of lessons learned, especially the need for a
meaningful provider certification if customers are to receive
consistent, high quality EBCx projects.
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At the end of this session, participants will be able to:
1. Identify several best practices for Existing Building Commissioning
1. Requires specialized training
2. Would benefit from a rigorous certification process
2. Understand how to identify buildings where EBCx can be effective
1. Cost effectiveness of the investigation must be considered
3. See how quality assurance improves customer outcomes
Learning Objectives
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PBEEEP
Created in 2008 by MN State Legislature
Meet two important needs:
Access to technical services that will identify savings
Access to funding to implement identified savings
Designed in partnership with PECI
Providers were selected before program development
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PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP
Standard Process
Application
Screening
Investigation
Implementation
Verification
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PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP
Apply Screen Investigate Implement Verify
Unique features of a State Sponsored program
Competitively Bid Phases
Scope of work was well defined
List of typical measure had to be checked
Equipment was listed in detail
All energy consuming equipment
Anything that affected the energy consuming equipment
State statute limited measures to 15 year payback or less
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PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP
Distinctive Uses
Community Colleges
Prisons
Laboratories
Armories
Museums
State Offices
Parking Garages
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CHARACTERISTICS OF THE BUILDINGS State Government Buildings
State Government Buildings CBECS Estimates for MN
825 buildings over 50,000
square feet
45 buildings can be rated by
Energy Star
9 State Agencies
Distance:10 to 300 miles
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CHARACTERISTICS OF THE BUILDINGS State Government Buildings
4,600 buildings over 50,000
square feet
1,800 over 100,000 sq. ft.
542 ENERGY STAR labeled buildings with 102,873,953
square feet
1.8% of US Building stock
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SELECTION FOR INVESTIGATION Self- selection followed by screening
> 50,000 sq ft Applied and Screened InvestigatedAll State Government Buildings
51.4 million sq ft
3,047 buildings
1,428 sites
4,860 MMBTU
18.3227 50 2,087
34.3550 bldgs71 sites3,000MMBtu
44 million sq ft825 buildings145 sites4,345 MMBtu
Processed thru PBEEEP
90%
11%
44% of all of all energy
Key attributes Need one or more of these
Building Automation with DDC capable of trending
Trend 1,000 or more points at a time
15 minute interval
Memory for several hundred thousand points
Remote access highly desirable
Observed potential for optimization
Motors > 10 HP
Variable Occupancy Schedule
EUI >80 kBtu/ft2yr
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SCREENING CRITERIA Developed over the course of the program
Period 2010-2012 for both programs
PBEEEP
Results of Studies
17,800,000 kWh found
95,000 Dt found
$21.07 per MMBtu
Large MN Utility
Results of Implementation
29,600,000 kWh saved
58,000 Dt saved
$23.65 per MMBtu
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PBEEEP IS A UTILITY SCALE PROGRAM Comparison with large state utility program
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PBEEEP WORKED ACROSS MANY UTILITY
TERRITORIES
37 different utility companies
3 offer study rebates
27 of 71 sites had one utility for electric and gas
Means 2/3 have two utility companies
All sites had both electrical and gas (or district)
savings
Coordination of programs is uncommon
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Summary of Most Commonly Identified
Energy Savings Measures
Number
Finding Type
Payback (years)
Affected area (%)
Site energy savings
(kBtu/ft2yr)
135 Time of day enabling is excessive 1.1 66% 3.3 97 Economizer operation not optimal 4.4 71% 2.0 88 Excess enabling of equipment 0.7 68% 2.1 88 Retrofit - Efficient Lighting 8.2 33% 1.2 44 Zone setup/setback 0.9 16% 2.6 23 Other controls 11.3 14% 3.1 21 Lighting on more hours than necessary 4.7 12% 1.1 21 Other retrofit (mostly faucet aerators) 1.9 10% 0.8 17 Deferred maintenance 2.9 12% 1.2 14 Leaky/stuck valve 1.9 4% 3.9 116 All others 6.7 107% 1.7 664 Total 3.9 412% 2.1
Note that an affected area of 412% means there
were 4.1 measures per building, on average
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HIGHLY SUCCESSFUL OVERALL EXCELLENT SAVINGS AND HIGH PARTICIPATION
Program Wide Savings of 7.2%
Could we do even better?
Source # Projects Savings/project
2010 NCBC (PECI) 122 3.0 kBtu/ft2
PBEEEP 50 8.1 kBtu/ft2
Building Population Energy used in Bldgs
>50,000 ft2
Participation
All MN (CBECS) 47,600 MMBtu ?
Minnesota Government 4,345 MMBtu
2,087 MMBtu = 48%
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QUALITY ASSURANCE PROCESS RESULTS Meeting the base standard for a final report
Expected Process Actual Process
Investigation
Mid Point Review
Investigation
Final Review
6-9 month process
Midpoint review only
submitted 50% of time
4.1 total review cycles
18 month process
Final reviews required
significant rework
QA Process found many issues to address
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Investigation payback is the payback period based only on the investigation cost;
Implementation payback is based only on the cost of implementation
PROJECT PORTFOLIOS
Provider Sites Buildings Area
Investigation
Cost Savings $
Million BTU
Saved
Investigation
Payback
Implementation
Payback kbtu/sft
A 8 34 2,706,030 520,500$ 270,803$ 32,946 1.9 5.0 12.2
B 7 29 2,546,229 458,813$ 247,497$ 24,976 1.9 3.5 9.8
C 9 36 2,534,193 442,158$ 239,668$ 22,129 1.8 5.3 8.7
D 7 39 3,555,996 556,810$ 292,120$ 25,983 1.9 4.3 7.3
E 4 15 1,964,321 296,000$ 150,075$ 13,555 2.0 1.4 6.9
F 5 23 2,098,880 323,777$ 126,350$ 12,070 2.6 1.6 5.8
G 9 42 3,083,884 582,111$ 224,689$ 15,903 2.6 2.6 5.2
Total 49 218 18,489,533 3,180,169$ 1,551,202$ 147,562 2.1 3.7 8.0
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Results of Calculation Reviews
SAVINGS CALCULATIONS REQUIRED
REVISION MOST OF THE TIME Initial submitted savings calculations were reduced by an average of 34%
14% of submitted results were within 2% of
approved value
20% were below the approved value and the
reported savings were INCREASED
66% were above the approved value and the
reported savings were DECREASED
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The unequal distribution of savings due to measures associated with economizer operations is seen as one of the strongest signs that not all providers were equally well prepared to do EBCx work
COMPARING SCHEDULING AND
ECONOMIZER MEASURES
Degree of difficulty shows need for certification
0
1
2
3
4
5
6
A B C D E F G
kBtu
/sq
. ft.
Provider
Scheduling
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The scale for all the reported savings graphs is the same.
Controls includes adjustments and strategies including all reset schedules (HW, CHW, SAT, DSP), controls hunting, and all VFD issues
SAVINGS FROM CONTROLS MODIFICATIONS
WERE DISAPPOINTING (7% of total) Again, almost no findings from three providers
0
1
2
3
4
5
6
A B C D E F G
kBtu
/sq
. ft.
Provider
Controls
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IF YOU COULD CHANGE ONE THING, WHAT
WOULD IT BE?
Have a method for selecting previously trained providers
A recognized certification process would deliver this
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The cost of screening, investigation and administration (including
quality control) were near the expected value, but the cost of
implementation was lower.
The cost of implementation is consistent with other EBCx programs
PROGRAM CAME IN UNDER BUDGET Even the rigorous QA process did not exceed its target cost and it helped
lower total program costs
ActualBudget
Screening
Investigation
Admin/QA
Implementation
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The number of long (> 3 year) payback items that were
selected for implementation was encouraging as it affirmed the idea of bundling high and low payback items for increased total savings.
PROGRAM SUCCESS:
RATE OF IMPLEMENTATION IS HIGH Due to fast payback and confidence that savings will be realized
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Qualified providers who understand the specialty of
existing building commissioning are essential to identify
all the potential savings
A good customer relationship will increase the rate of
implementation
Programs should address all energy sources at a site
Careful selection of buildings is necessary for a cost-
effective program; some buildings have minimal savings
opportunities.
BEST PRACTICES AND LESSONS LEARNED Without a quality assurance process, we would not have known….
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Center for Energy and Environment
Gustav Brandstrom, PE Tim Ellingson, PE
Neal Ray Angela Vreeland, PE
Russ Landry, PE Christie Traczyk
Pam Klocek
State of Minnesota
Department of Administration, Real Estate and Construction Services
Department of Commerce, Division of Energy Resources
US Department of Energy
American Recovery and Reinvestment Act Funds
THANK YOU To the entire team
THANK YOU
Mark Hancock, PE [email protected]
Christopher Plum [email protected]
Center for Energy and Environment
Poster child site
MN History Center
20 Years old
Museum, 490,000 ft2
Site EUI dropped from 159
in 2009 to 78 in 2012
3.2 year payback
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EXISTING BUILDING COMMISSIONING Case Study of Success
Major BAS upgrade 2 years before
Lighting study rejected by client
Used waste heat from chiller to eliminate need for summer boiler
Revised schedule at the space, not building, level (12 AHU’s)
Added VFDs
Cafeteria grill ventilation interlock
Low flow faucets (300 kids per day)
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Scheduling: Not just reading the hours posted on the front door
Minnesota History Center Energy Saving Opportunities