Making Building Systems Sing in Harmony Retrocommissioning ...
Transcript of Making Building Systems Sing in Harmony Retrocommissioning ...
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Making Building Systems Sing in Harmony
Retrocommissioning in Vermont
Daniel Tuhus-Dubrow
Cx Associates
Presented by:
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Agenda
What is Retrocommissioning?
The RCx program in Vermont
RCx Process
Common RCx Findings
Case Studies
Challenges and Opportunities
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Retrocommissioning is…..
Process for ensuring systems and equipment are operating per the current facility requirements
Repairing Deficiencies
Optimization of Existing Building Operation
Measures are typically low or no cost to implement
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Retrocommissioning is…..
Other Potential Benefits Operations and Maintenance Occupant Thermal Comfort Improved Indoor Air quality
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Retrocommissioning is NOT…..
Capital improvement projects:
However… Equipment at the end of its useful life will often be identified through the RCx process.
Lighting retrofits
Equipment replacement
Window upgrades
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Reducing Greenhouse Gas Emissions
Commercial buildings consume nearly half of the building energy used in the United States (around 20% of total U.S. energy consumption and greenhouse gas emissions)
RCx Potential
Saving Money
Median whole building energy savings of 16%
Median cost of $0.25 per sf
Median payback time of 1.1 years
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RCx Potential
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The RCx Program in Vermont
Programs from Efficiency Vermont and BED
Qualify Develop Implement Verify
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Steps in Qualifying Phase
Pre-qualify
Walkthrough by team
Findings and Recommendations
Estimate energy savings
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Development Phase
Document Baselines
Refine Savings Estimates
Develop Scopes of Work
Obtain Pricing for Implementation
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Implementation Phase
Pay for performance
$0.10/kWh up to $25,000
Vendors implement recommendations
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RCx Process
Building Energy Benchmarking
Review Available Documentation
Utility Data Analysis
Site Visits and Field Investigations
Trend Data Analysis
Measure Development
Implementation
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Benchmarking
Energy Star Portfolio Manager
DOE Building Performance Database
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Benchmarking
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Building Documentation
Mechanical/Electrical Drawings
Controls Drawings
TAB reports
Previous energy assessments
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Utility Data Analysis
Monthly Bills
Electric Interval Data
Delivered Fuels
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Utility Data Analysis
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Interval Data Analysis
Opportunity to Adjust Operating Schedule?
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Interval Data Analysis
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Interval Data Analysis
Occupied Baseload
Cooling Balance Temp
Cooling Demand
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Interval Data Analysis
0 25 50 75 100
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Site Visits
Meeting with Key Stakeholders
Systems Assessment
Datalogger Deployment
Targeted Testing
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Kickoff Meeting
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Teamwork
Have the
right people!
Team
Commissioning Engineer
Controls Contractor
Facilities Staff
Introduce Perspectives
Brainstorm
Identify Opportunities
Evaluate Merit
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Building Walkthrough
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Systems Assessment
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BAS Remote Monitoring
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BAS Remote Monitoring
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Dataloggers
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Trend Data Analysis
Verify existing control sequences
Are setpoints being maintained?
Is economizer operating properly?
Are resets working as intended?
Is equipment running per schedule?
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Trend Data
Analysis
Spreadsheet based charting
Universal Translator
Dedicated analytics software
Other Tools
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Trend Data Analysis
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Trend Data Analysis
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Methods for Estimating Savings
End Use Disaggregation
Engineering Calculations Bin Calcs Hourly Spreadsheets
Regression Models
Energy Simulation
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Common RCx Findings
• Scheduling
• Economizer Operation
• Simultaneous heating and cooling
• Calibrating or relocating sensors
• Return Equipment to AUTO control
• Release BAS Overrides
• VAV box minimum flow settings
• Correct VFD settings
• Optimize Control Sequences
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Operating Schedules
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Throttled Valves
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Stuck Dampers
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Equipment Overrides
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Damaged Sensors
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Measure Development
Document baselines
Focused PFCs and FPTs
Refine savings estimates
Develop scopes of work
Obtain pricing
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Project Case Studies
Building Types Hospitals Universities K-12 Schools Office Buildings Ski Resorts Food Processing Municipal
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Projects Overview
N = 28 6,000 – 200,000 sf Median = 34,800
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Projects Overview
> $350,000 potential savings 0.5 – 4.5 years Median = 1.9
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Hospital AHU Optimization
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Measure Summary
Dehumidification setpoints unnecessarily low (40-45%)
Economizer lockout setpoints unnecessarily low
Economizer controlling to MAT setpoint rather than SAT setpoint
Implement static pressure reset
Enable supply air temperature reset
Used Guideline 36 recommendations where possible
Verify calibration of controlling sensors
Unnecessary filters with higher efficiency than required
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Hospital AHU Optimization
Pre Post
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Challenges
Getting to Implementation Measure Persistence
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Implementation
Facility buy-in
EVT / BED involvement
Incentives help
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Measure Persistence
Training is KEY
Post-Implementation BAS Monitoring
Establish continuous energy improvement program
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Opportunities
LARGE MARKET POTENTIAL
ONGOING COMMISSIONING
ENERGY MANAGEMENT INFORMATION
SYSTEMS
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Ongoing Cx
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Thank You!
Daniel Tuhus-Dubrow
Senior Engineer
Cx Associates
Burlington, VT
802-861-2715 x21