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

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Presentation on theme: "Intro to Enersol What is Retro-commissioning? Define Benefits of Retro-commissioning Define Retro-commissioning Process Discuss Retro-commissioning Findings."— Presentation transcript:

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

2 Our Mission We provide energy management solutions with the quickest possible ROI by retro- commissioning existing building systems to be more efficient using green strategies.

3 What is retro-commissioning? A systematic process for improving building performance ► Operationally ► Continuously

4 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

5 What is the retro-commissioning process? Planning Phase Investigation Phase Implementation Phase Operating Phase

6 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

7 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

8 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

9 Implementation Phase/Steps Implement recommended opportunities and correct operational deficiencies Performed by: – Internal maintenance staff – Program manager, controls contractor, service, TAB, electrical contractor

10 Implementation Phase Verification: Verify modifications are in place Perform functional tests to assure modifications are operating as designed Trend performance to verify energy savings

11 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

12 “Top 10” HVAC Opportunities Found 10. Verify lighting controls schedules/effectiveness 9. Terminal unit tune-ups – dampers & valves 8. Improve cooling tower sequencing/lower cond. water temps 7. Improve chiller sequencing 6. Return VFDs to variable speed operation 5. Optimize supply air static pressure set points 4. Ensure proper ventilation airflow rate 3. Optimize/restore economizer operation 2. Implement reset schedules to eliminate simultaneous heating and cooling 1. Turn off equipment when not needed (Scheduled S/S)

13 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)

14 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

15 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%

16 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%

17 Available for download EPA Guide for Rx EnergyStar Guide for Rx

18 Portland Energy Conservation Inc – Building Commissioning Association, “Practical Guide to Commissioning Existing Buildings,” Haasl & Sharp, 1999, ateam.lbl.gov/mv/docs/RetroCommissioningGuide.pdf ASHRAE, Guideline , “The HVAC Commissioning Process,” “Continuous Commissioning Guidebook for Federal Energy Managers” U.S. DOE / FEMP,www.eere.energy.gov/femp GSA Commissioning Handbook, CBECS, Energy Star Portfolio Manager,

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