Transcript Retro-commissioning rx

• Intro to Enersol
• What is Retro-commissioning?
• Define Benefits of Retro-commissioning
• Define Retro-commissioning Process
• Discuss Retro-commissioning Findings
• Typical Investment
• Questions
Our Mission
We provide energy management solutions with
the quickest possible ROI by retrocommissioning existing building systems to be
more efficient using green strategies.
What is retro-commissioning?
• A systematic process for improving building
performance
► Operationally
► Continuously
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
What is the retro-commissioning process?
• Planning Phase
• Investigation Phase
• Implementation Phase
• Operating Phase
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
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
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
Implementation Phase/Steps
• Implement recommended opportunities and correct operational
deficiencies
• Performed by:
– Internal maintenance staff
– Program manager, controls contractor, service, TAB,
electrical contractor
Implementation Phase Verification:
• Verify modifications are in place
• Perform functional tests to assure modifications are operating
as designed
• Trend performance to verify energy savings
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
“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)
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)
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
• 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%
• 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%
Available for download
www.enersolcompany.com/employeeservices
EPA Guide for Rx
EnergyStar Guide for Rx
• 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