www.sebesta.com commissioning of new and existing buildings alexander p. boucher, p.e., cem, leed...
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www.sebesta.com
Commissioning of New and Existing Buildings
Alexander P. Boucher, P.E., CEM, LEED BD+C
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• Introduction• Commissioning – New Buildings• Retro Commissioning – Existing Buildings• On-going Commissioning – Existing Buildings• Case Studies• Owner Benefits
Agenda
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• Integrated Services• #1 Cx Provider by CSE (2009/10)• Rank as ENR Top 500 Firm
Introduction
• 100% employee-owned• Local Partnerships• Multiple Offices • Nationwide project resume
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• Commissioning – New Buildings• Retro-Commissioning – Existing Buildings• On-Going Commissioning – Existing Buildings• Sustainable Solutions• Energy Performance and Modeling• Energy Assessments• Measurement and Verification• MEP Systems Design Services• Central Utility Plant and Distribution
Technical Expertise
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What is Commissioning?
“Systematic process of assuring that a building is designed, constructed, and performs efficiently in
Accordance with the design intent and the owner’s Operational needs, and that sets the structure to
Continue these operations throughout the life of thebuilding.”
-2005 NEBB Standard
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Improved Lifecycle
Performance
Energy Efficiency
More Complex & Powerful Systems
Changes in the
Industry
Building Systems
Impact on Occupants
Why is Commissioning Needed?
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1. Systems to Commission2. Phases of Commissioning3. Commissioning Value4. LEED®
New Building Commissioning
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Typi
cal S
yste
ms • HVAC
• Electrical• Lighting• Plumbing• Medical
Gas
Opti
onal
Sys
tem
s • Life Safety• Building
Envelope• Security• Integrated
Systems Test
What Systems are Commissioned?
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Pre-Design Phase
Design Phase
Construction Phase
Acceptance Phase
Warranty Phase
Commissioning Phases
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Owner Technical Support
• Specify Performance
• Document Review
Delivered Value
• Operations Perspective
• Accessibility
• Maintainability
• Commissionability
Commissioning Phases - Design
Commissioning Plan
Design IntentDocument Design Review Commissioning
Specifications
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Purpose• Build in Quality• Add Expertise to
Construction Team
Delivered Value• Scheduling Support • System Documentation• Operational Inspection • Early Issue Identification &
Resolution
Commissioning Phases - Construction
Schedule Commissioning
Activities
Shop Drawing Review
O&M Document
Preparation
Training Plan Review
Regular Coordination Meetings/Site Visits
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Delivered Value• Systems that Work• Operational Clarity• Trained Operators• Building Acceptance• Documented History
Commissioning Phases - Acceptance
Final Commissioning
Report
Systems Training
Functional TestingTraining
Deficiency Correction
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Delivered Value• Performance Confirmation• Reinforced Training• Issue Identification/ Resolution• Warranty Support
Commissioning Phases - Warranty
Deferred Testing
10-Month Check-Up
Amend Final Commissioning
Report
Reinforce Training
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Reduce Total Ownership Costs Improve Energy & Water Efficiency
Safe, Healthy & Productive Built Environment Promote Sustainable Stewardship
Commissioning Values
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Commissioning for LEED BD+C
Fundamental Commissioning vs. Enhanced Commissioning– Additional Design Reviews– Additional Submittal Reviews– Systems Manual– Warranty Phase Activities– Training
Additional Activities for Commissioning Agent– Review of Building Energy Model– Implementation of M&V Plan– LEED Facilitation
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1. What is Retro-Commissioning2. Investigate Opportunities3. Measurement and Verification4. Retro-Commissioning Outcomes5. LEED®
Existing Building Retro-Commissioning
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Focus more on optimizing existing systems
In-depth look at controls and sequence of operations
• Space use changes• Life safety and code updates• Possible system upgrades
Identify gaps between initial design and current operation
What is Retro-Commissioning
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Areas of High Complaint/High Use
Lighting – in and outParkingHVACAir balanceControlsChillerBoilerKitchenLaundryPool or spa
Investigate Opportunities
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Identified Opportunity
Identified Construction
Cost Identified Savings
SPB Range Yrs
Tune-Up Controls $174,000 $117,000 0.3 - 3.7 Operational Changes $22,000 $84,000 0.0 - 1.7 Schedule Equipment $34,000 $67,000 0.2 - 1.0 Condenser Water Reset $12,000 $23,000 0.1 - 2.2 Rebalance Systems $50,000 $21,000 1.7 - 4.2 Resolve Damper Issues $13,000 $15,000 0.4 - 5.0 Fix Pipe Insulation $25,000 $13,000 1.8 - 2.5 Add Spa Cover $4,000 $3,000 1.0 - 2.5 Clean Condenser $1,000 $1,000 1.0 - 1.0
Total $335,000 $344,000
Our Experience: Typical Opportunities
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Measurement & Verification
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Space Temperature SetpointSpace TemperatureReheat Valve PositionSB Data Logger Air TemperatureAHU Discharge Air Temperature
Full Heating - Setpoint 90°FFull Cooling - Setpoint 50°FNormal Condition - Setpoint 72°F
At 8:56am, set room to full cooling
At 9:27am, set room to full heating
At 9:54am, set room to normal condition
SB data logger in supply diffuser (1 minute sample rate)
Verify identified opportunities were correctly implemented:– Performance Testing– Equipment Metering– System Trending
Create New System / Equipment Benchmarks:– Perform ongoing reviews of performance– Maintain system parameters for performance– Annual assessment and testing
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Outcomes – material changes implemented– Improved energy efficiency– Improved building performance– Identify Energy Conservation Measures for future investment– Documentation– Training
Retro-Commissioning Results
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Commissioning for LEED O&M
LEED O&M V3 and Retro-Commissioning– Up to 6 LEED Credits– Energy Audits– Assistance in Greenhouse Gas Assessments– Refrigerant Reduction Calculations– Measurement and Verification– Training– Improved Operations
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1. What is On-Going Commissioning2. On-Going Commissioning Outcomes
On-Going Commissioning
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Utilize technology to continuously monitor and analyze building performance
Continuous/ periodic feedback to building operators
Operations adjusted/ maintenance activities initiated to immediately address performance issues
On-Going Commissioning
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Outcomes– Continuous improvement- energy efficiency and
building performance– Issues identified quickly– More focused efforts for building operators
On-Going Commissioning - Outcomes
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National Gallery of Art Phased Renovation – New Construction• 125,000 GSF per phase.• Art Galleries, Restoration and Preservation Labs• Major renovation of all HVAC, Electrical, Plumbing and Art Handling
Systems.
Case Studies
Benefits and Outcomes:• Improved performance and Reliability.• Reduced equipment outages • Early resolution of design issues.
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University of Iowa Retrocommissioning Study
• Bowen Science Building• 375,000 gsf of mixed use labs and
offices
Energy Savings Opportunities• Replacing or retrofitting failed VAV
boxes• Upgrading the building
automation system• Installing an energy recovery
system on exhaust systems• Reducing lighting levels to current
standards• Potential energy savings of more
than 35% with an average 2-year payback
Case Studies
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• Proper Environmental Control
• Improved Indoor Air Quality• Optimized Energy Profile
• Persistence of Savings• Occupant Acceptance• Certification/Accreditation
Owner and Occupant Benefits
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Commissioning Financial Incentives
• Median Costs – $0.30 per sq. ft [Existing Building]– $1.16 per sq. ft [New Construction]
• 13-16% energy savings• Median payback period of 1.1 to 4.2 years
– Lawrence Berkeley National Laboratory 2009 [http://cx.lbl.gov/]