ComEd Retro-Commissioning Program

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ComEd Retro-Commissioning Program presented by Jay Amundson at the Illinois Chapter of ASHRAE May 2011 Meeting.

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ComEd Retro-Commissioning Program

  1. 1. Retro-commissioning Program Overview
  2. 2. Agenda Energy Efficiency Portfolio Business Case for Energy Efficiency RCx Program Overview Measurement & Verification Questions
  3. 3. ComEd Smart Ideas for Your BusinessEnergy Efficiency Portfolio 1. Prescriptive Program 2. Custom Program 3. New Construction Program 4. Technical Assistance Service 5. ComEd RCx program – service is the incentive 6. Compressed Air Program 7. Residential Program 8. Load Response Program 9. Others  Measures implemented in RCx do not qualify for or overlap with additional incentives through other ComEd programs
  4. 4. A Business Case for Energy Efficiency:The Triple Bottom Line People (human capital): • Industry leadership among peers • Employee satisfaction • Attract forward thinking tenants/customers • Competitive edge among similar facilities Planet (natural capital): • Reducing CO2 emissions produced by electricity & gas reduces the greenhouse effect Profit (economic value): • Real estate benefit, higher building value, tenant rates • Lower operational costs, extends equipment life • Reduced electric & gas bill
  5. 5. A business case for energy efficiency • 8-9% operating costs* • 7.5% building value Perceived increases* Business • 6.6% return on investment Benefits improves* • 3.5% occupancy ratio to Green increases* • 3% rent ratio increases** Source: *McGraw-Hill Construction, Key Trends in the European and U.S. Construction Marketplace SmartMarket Report, 2008 **McGraw-Hill Construction, Greening of Corporate America SmartMarket Report, 2007 5
  6. 6. Building system deficiencies Envelope For projects where deficiencies EMS were characterized, 63 percent 0.1% Lighting 3.1% Plug loads of problems were related to the 3.6% 0% overall HVAC system in some HVAC 0.1% fashion. 4.2% Air Handling 37.1% Terminal units 4.4% Heating plant 6.3% Cooling plant 11% OtherSource: E SOURCE; data from Lawrence Berkeley National Laboratory, 30.1%Portland Energy Conservation Inc., and Energy Systems Laboratory, TexasA&M University 6
  7. 7. Retro-commissioning, what is it?• Retro-commissioning (RCx) – The process of bringing a building’s mechanical and electrical systems, including building controls, to peak performance. – Investigation of existing system performance, the adjustment of the operating parameters and the repair of equipment.• Goal: identify low-cost operational improvements that deliver high energy savings• Perform building tune-up and adjust existing systems, typically without capital costs• Collaboration between Building Operator & RCx Service Provider 7
  8. 8. Common Misunderstandings RCx:• RCx is not an energy audit.• RCx is not a facility evaluation.• RCx is not a feasibility study.• RCx is not a study to determine technical feasibility of capital- investment type energy efficiency projects (co-generation unit) 8
  9. 9. Benefits to RCx, energy and non-energy• Reduce building operating costs (energy, maintenance, premature equipment replacement).• Extend equipment service lifetime.• Improve building performance and system integration.• Increase asset value of the property.• Reduce comfort complaints.• Identify potential indoor environmental quality issues.• Ensure building operations meet owner’s requirements.• Can increase occupant productivity and safety.• Provide building operator training. 9
  10. 10. Lawrence Berkeley National Laboratory study• Median RCx costs (332 projects) were $0.30/ft2• Median cost savings were $0.29/ft2 -per year• Median electrical demand savings from baseline consumption is 5%• Median electrical annual energy savings from baseline is 9%• Median total annual energy savings from baseline is 16% The source of this information is Building Commissioning: A Golden Opportunity for Reducing Energy Costs and Greenhouse Gas Emissions, Evan Mills, Ph.D., Lawrence Berkeley National Laboratory, July 21, 2009, http://cx.lbl.gov/documents/2009- assessment/LBNL-Cx-Cost-Benefit.pdf 10
  11. 11. Natural Gas Joint Electric & Natural Gas Energy Efficiency program • Nicor • Peoples Gas • North Shore Gas Retro-commissioning: • Electric and Natural Gas combined into program • Pilot program last year • Year 2 starting on June 1, 2011
  12. 12. RCx Program Overview
  13. 13. Program Overview  Application Phase: Screening, set goals  Planning Phase: Identify measures, operational adjustments  Investigation Phase: Baseline data  Implementation Phase: Customer installations  Verification Phase: Report final data to ComEd
  14. 14. Customer Commitments  Program Agreement signed after the RCx Plan is presented  Commit $10,000 minimum with Simple Payback < 1.5  Meet deadline specified in Program Agreement  Support the RSP team in their investigation  Select and manage the implementation team  Building Operator Certification, CC
  15. 15. Application Phase  Screening process for selecting successful projects  To help ensure program cost-effectiveness, an energy savings target is set, average PY3 is 600,000 kWh / year
  16. 16. Planning Phase  Evaluate function, sequencing and scheduling of major systems  Interview with facility operation staff  Set up Building Automation System (BAS) trends  Spot check equipment on BAS  Plan critical items for investigation and verification phases  Identify sufficient measures to achieve target  Planning Phase milestone decision: 1. Proceed to Implementation Phase 2. Modify RCx scope if energy savings too low 3. End RCx project at Planning Phase
  17. 17. View daily, weekly, or monthly usage trends Click on a specificday to narrow down your costs.
  18. 18. Planning Phase deliverables Retro-commissioning Plan Preliminary D&C Plans Customer Selection Form Building Equipment List* Site Assessment Form**Alternative forms OK with pre-approval
  19. 19. Customer Selection Form
  20. 20. Investigation Phase  Detailed investigations by RSP  Functional testing  Collect trend logs or data logs  Revise energy saving estimates  Define scope of work for candidate measures  Bi-Weekly Meetings  Diagnostic & Calculation Plans present findings
  21. 21. Investigation Phase deliverables Investigation Report D&C Plans Customer Selection Form Standard RCx Procedure Forms Building Equipment List
  22. 22. Implementation Phase  Bi-Weekly Meetings  Customer responsible to implement measures  Deadline set at 120 days from Program Agreement , or April 1  RSP provides technical support to implementation team
  23. 23. Verification Phase  Inspect RCMs for installed equipment and controls modifications  Execute measurement & verification (M&V) Plan from Diagnostic and Calculation Plan  Set up trends depending on measure (one to four weeks)  Conduct functional test depending on measure  Perform spot measurements  Revise calculations as necessary
  24. 24. Verification Phase deliverables  Customer Selection Form for completion of RCMs  Verification Report  D&C Plans
  25. 25. Common RCx Measures• Fixing ventilation dampers that are open when they should be closed (or vice versa).• Adjusting chiller operation to better match building load conditions.• Aligning zone temperature set-points to match the buildings actual occupancy• Reducing ventilation in over-ventilated areas.• Eliminating simultaneous heating and cooling.• Reducing supply air static pressure set points.• Focus on cost-effective operation and maintenance improvements (education to staff on continuous building performance, digital controls with schedules, etc.)• Properly tune equipment for maximum efficiency.• Sustainability in optimum performance schedules (eliminate manual controls where human interference is more accessible)• Optimize building systems as a whole, functioning together• Free energy – use outside air and lighting when available• Demand savings – operate equipment as needed or when occupied 25
  26. 26. Measurement & Verification Overview
  27. 27. Calculation and M&V Guidelines• Adherence eases QC process for RSP and Nexant• Adherence improves evaluation results
  28. 28. Measure tiers Measure Impacts Percent of Total Site Measure Category (kWh/yr) RCx Savings >75,000 Any Tier 1 (Large) 75,000 > 25% Tier 1 (Large) 75,000 25% Tier 2 (Small) Measures tiers are defined at a strategy level
  29. 29. Why measure tiers?• Focus RSP efforts on larger impacts!• PY2 Results: – 125 Measures in commercial buildings – Small Measures (<75,000 kWh) • Were only 26% of total impacts • But covered 78% of the # measures we looked at• Ways to decrease efforts on small measures: – Provide calculators – Reduce M&V requirements for small measures
  30. 30. Tier 1 requirements• Savings calculations based on engineering principles – “Rules of Thumb” not acceptable• MS Excel based custom calculations – Whole-building models not acceptable – Modeling of buildings/systems with packaged software only with prior approval• International Performance Measurement and Verification Protocol (IPMVP) Option A or B – Based on field-measured data of both pre-install and post-install – 2-3 weeks of trending on important parameters – Spot measurements supporting trend data
  31. 31. Tier 2 requirements• Savings calculations based on engineering principles – “Rules of Thumb” not acceptable• MS Excel based calculations – Program provided calculators for 10 common measures – Custom calculators developed by RSP for other measures – Custom calculators developed by RSP where template calculator not fitting• M&V for critical items – Screen shots of pre- and post- install setpoints – Spot measurements for select data – Trending where critical
  32. 32. Tier 2 calculators• Template calculators – Adjust economizer setpoints – Demand control ventilation – Schedule single AHU – Duct static pressure reset/reduce – Schedule CHW or HW pumps – Condenser water reset – Chilled water reset – Supply air temp reset – Pump differential pressure reset/reduce – Reduce minimum VAV box position
  33. 33. RCX Process Summary Before RCx Submit Kick-off Screening application Meeting Site Interview Collect Data RCx Plan Assessment Operators Sign Invest- Sign CSF D&C Agreement igations Select Implement Contractors Measures
  34. 34. Thank you…Questions?

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