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Results from minnesota’s existing building commissioning program
The document summarizes the results of Minnesota's Existing Building Commissioning Program, which investigated 227 state government buildings containing nearly 19 million square feet. Key findings include that specialized training and provider certification would benefit commissioning programs, investigations identified an average of over 4 measures per building with average site energy savings of 2.1 kBtu/ft2yr, and implementation of measures resulted in a program-wide savings of 7.2%. Quality assurance improved outcomes for customers but identified a need for more consistent, high-quality work from commissioning providers.
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Results from minnesota’s existing building commissioning program
- 1. Chris Plum, MarkHancock Center for Energy and Environment Results from Minnesota’s Existing Building Commissioning Program 21st National Conference on Building Commissioning
- 2. AIA Quality Assurance TheBuilding 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. 21st NCBC Conference
- 3. Presentation Description CEE administersthe 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. 21st NCBC Conference
- 4. At the endof 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 21st NCBC Conference
- 5. PBEEEP Created in2008 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 21st NCBC Conference PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP
- 6. Standard Process Application Screening Investigation Implementation Verification 21st NCBC Conference PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP Apply Screen Investigate Implement Verify
- 7. Unique features ofa 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 21st NCBC Conference PROGRAM BACKGROUND “Public Buildings Enhanced Energy Efficiency Program” = PBEEEP
- 8. Distinctive Uses CommunityColleges Prisons Laboratories Armories Museums State Offices Parking Garages 21st NCBC Conference CHARACTERISTICS OF THE BUILDINGS State Government Buildings
- 9. State Government BuildingsCBECS 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 21st NCBC Conference 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
- 10. 21st NCBC Conference SELECTIONFOR 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 18.3 227 50 2,087 34.3 550 bldgs 71 sites 3,000MMBtu 44 million sq ft 825 buildings 145 sites 4,345 MMBtu Processed thru PBEEEP 90% 11% 44% of all of all energy
- 11. Key attributes Needone 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 21st NCBC Conference SCREENING CRITERIA Developed over the course of the program
- 12. Period 2010-2012 forboth 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 21st NCBC Conference PBEEEP IS A UTILITY SCALE PROGRAM Comparison with large state utility program
- 13. 21st NCBC Conference PBEEEPWORKED 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
- 14. 21st NCBC Conference Summaryof Most Commonly Identified Energy Savings Measures Number Finding Type Payback (years) Affected area (%) Site energy savings (kBtu/ft2 yr) 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
- 15. 21st NCBC Conference HIGHLYSUCCESSFUL 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%
- 16. 21st NCBC Conference QUALITYASSURANCE 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
- 17. 21st NCBC Conference Investigationpayback 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
- 18. 21st NCBC Conference Resultsof 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
- 19. 21st NCBC Conference Theunequal 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
- 20. 21st NCBC Conference Thescale 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
- 21. 21st NCBC Conference IFYOU COULD CHANGE ONE THING, WHAT WOULD IT BE? Have a method for selecting previously trained providers A recognized certification process would deliver this
- 22. 21st NCBC Conference Thecost 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
- 23. 21st NCBC Conference Thenumber 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
- 24. 21st NCBC Conference Qualifiedproviders 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….
- 25. 21st NCBC Conference Centerfor 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
- 26. THANK YOU Mark Hancock,PE mhancock@mncee.org Christopher Plum cplum@mncee.org Center for Energy and Environment
- 27. 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 21st NCBC Conference EXISTING BUILDING COMMISSIONING Case Study of Success
- 28. Major BAS upgrade2 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) 21st NCBC Conference Scheduling: Not just reading the hours posted on the front door Minnesota History Center Energy Saving Opportunities