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• Intro to Enersol • What is Retro-commissioning? • Define Benefits of Retro- commissioning • Define Retro-commissioning Process • Discuss Retro-commissioning Findings • Typical Investment • Questions

Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

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Page 1: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

• Intro to Enersol• What is Retro-commissioning?• Define Benefits of Retro-commissioning• Define Retro-commissioning Process• Discuss Retro-commissioning Findings• Typical Investment• Questions

Page 2: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Our MissionWe provide energy management solutions

with the quickest possible ROI by retro-commissioning existing building systems

to be more efficient using green strategies.

Page 3: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

What is retro-commissioning?

• A systematic process for improving building

performance

► Operationally► Continuously

Page 4: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

What are the benefits of retro-commissioning?

• Low cost to implement• Savings of at least 5% to 20% of energy costs

annually• Quick paybacks - typically 6 mo to 2 years• Performance improvements are sustainable

Page 5: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

What is the retro-commissioning process?

• Planning Phase• Investigation Phase• Implementation Phase• Operating Phase

Page 6: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Planning Phase/Steps

• Assess BAS capabilities, potential opportunities, and investigation approach.

► Obtain building data and benchmark performance► Review building operational issues► Quantify range of potential savings► Develop plan

Page 7: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Investigation Phase/Steps

• Determine intended vs. actual sequences of operation and prepare a prioritized list of the operating opportunities.

► Validate the operation of control system► Trend system points and document conditions► Identify changes to setpoints, schedules, &

sequences and cost/benefits

Page 8: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Investigation Phase Results

• As-found conditions• Adjustments or repairs made to systems (if any)• Results of evaluation and implementation plan• Implementation costs and savings estimated• Remaining issues that could not be resolved without upgrade repair-replacement project

Page 9: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Implementation Phase/Steps

• Implement recommended opportunities and correct operational deficiencies

• Performed by:– Internal maintenance staff– Program manager, controls contractor, service,

TAB, electrical contractor

Page 10: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Implementation Phase Verification:

• Verify modifications are in place • Perform functional tests to assure modifications are operating as designed• Trend performance to verify energy savings

Page 11: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Operating Phase/Steps

• Report operating improvements made and train the building operator how to sustain efficient operation – implement capital improvements• Update O&M data• Document set points and settings for systems• Verify operation of energy conservation strategies

– Track equipment run times (schedules)– Track temperatures against set points

Page 12: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

“Top 10” HVAC Opportunities Found

10. Verify lighting controls schedules/effectiveness9. Terminal unit tune-ups – dampers & valves8. Improve cooling tower sequencing/lower cond. water temps7. Improve chiller sequencing6. Return VFDs to variable speed operation5. Optimize supply air static pressure set points4. Ensure proper ventilation airflow rate3. Optimize/restore economizer operation2. Implement reset schedules to eliminate simultaneous heating and cooling1. Turn off equipment when not needed (Scheduled S/S)

Page 13: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Typical Control Checkout Findings:

• Sensors out of calibration• Inoperative dampers (pneumatic control, transducers, actuators, linkages, dampers)• Minimum OA damper settings• Inoperative control valves• Inoperative CHW/HW control valves• Inoperative variable frequency drives (VFDs)

Page 14: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Typical TAB Findings:

• Inadequate supply/return fan capacity• Duct leakage / Duct obstructions• Static pressure set points• Maintenance Issues: Dirty filters/broken fan belts• Terminal unit issues:

– Thermostats out of calibration– Reheat valves stuck or leaking by– Inoperative damper actuators– Air flow at terminal unit outside acceptable

tolerances

Page 15: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

• Cost depends on systems selected, size of building, type of building• Budgetary estimates:

– RCx from $0.30 to $0.70 per SF depending on scope of services required, size & type of building• Quick ROI (6 mo to 2 yrs)• Noticeable energy savings - typically 5 to 20%

Page 16: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

• Parking Structure Daylight Harvesting- Reduced energy usage for lighting using

existing controls

• Bldg 74 Floor 9, 10 and 11 Balancing Project- Reduced energy usage for VFDs by 10%

Page 17: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

Available for downloadwww.enersolcompany.com/employeeservices

EPA Guide for Rx EnergyStar Guide for Rx

Page 18: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings

• Portland Energy Conservation Inc – www.peci.org• Building Commissioning Association, www.bcxa.org• “Practical Guide to Commissioning Existing Buildings,” Haasl &

Sharp, 1999, ateam.lbl.gov/mv/docs/RetroCommissioningGuide.pdf• ASHRAE, Guideline 1-1996, “The HVAC Commissioning Process,” www.ashrae.org• “Continuous Commissioning Guidebook for Federal Energy Managers”

http://www.eere.energy.gov/femp/pdfs/ccg01_covers.pdf• U.S. DOE / FEMP,www.eere.energy.gov/femp• GSA Commissioning Handbook, www.gsa.gov• CBECS, www.eia.doe.gov/emeu/cbecs• Energy Star Portfolio Manager, www.energystar.gov/benchmark

Page 19: Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings