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San Diego Convention Center: RetroCx Case Study Presented By: Ted Spear, P.E., LEED AP O+M Mitchell Chvilicek, P.E., LEED AP BD+C, CxA Green Building Services,

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Presentation on theme: "San Diego Convention Center: RetroCx Case Study Presented By: Ted Spear, P.E., LEED AP O+M Mitchell Chvilicek, P.E., LEED AP BD+C, CxA Green Building Services,"— Presentation transcript:

1 San Diego Convention Center: RetroCx Case Study Presented By: Ted Spear, P.E., LEED AP O+M Mitchell Chvilicek, P.E., LEED AP BD+C, CxA Green Building Services, Inc. April 24, 2014

2 San Diego Convention Center RetroCx Case Study Description Utility-funded retrocommissioning at the 2.6 million- square-foot San Diego Convention Center (SDCC) proved to be a cost-effective way to improve building performance, reduce energy usage, lengthen equipment life, and improve indoor environmental quality and occupant comfort. Measures implemented resulted in an annual energy cost savings of $151, April 24, 2014 ACG Cx Energy 2014

3 San Diego Convention Center RetroCx Case Study Learning Objectives » Understand the objectives and process of the San Diego Gas & Electric (SDG&E) Retro-commissioning program which is administered by Portland Energy Conservation, Inc. (PECI). » Understand the facility conservation measures identified by the SDCC RetroCx process and the impact of implementation on building energy use and the resulting energy savings. » Understand the value of Retro-commissioning from the owner's perspective and identify lessons learned and how they may apply to other building RCx projects. » Strategize and plan how to position organizations, facilities, and projects for continual improvement by implementing a Retrocommissioning process. 2 April 24, 2014 ACG Cx Energy 2014

4 San Diego Convention Center RetroCx Case Study SDCC Information 3 April 24, 2014 ACG Cx Energy 2014 » The Convention Center facility spans eight city blocks and incorporates 2.6 million square feet » 1,763,876 square feet of conditioned space » Opened 1989 » Expansion in 2001 (East Building) » Coming Soon! » Phase III (Mid 2018) » 401,500 Square Feet of meeting & exhibition space

5 San Diego Convention Center RetroCx Case Study SDCC Information 4 April 24, 2014 ACG Cx Energy 2014 » September 2011 » Certified LEED – EBOM Silver » Source EUI – 136 kBTU/SF (34% better than national average = 12 points EAc1) » 2013 economic impact = $1.28 Billion » Hosted 148 events » Welcomed over 766,848 guests » Largest annual event is Comic Con

6 San Diego Convention Center RetroCx Case Study SDCC Information 5 April 24, 2014 ACG Cx Energy 2014 » Central Plant » Two 500 MBH Natural Gas Boilers » Two centrifugal water-cooled 600 ton chillers w/VFD’s (2005) » Two centrifugal water-cooled 1,200 ton chillers w/VFD’s (2001) » One centrifugal water-cooled 1,200 ton chiller wo/VFD (IGV) (2005) » Four other remote air-cooled chillers » Constant volume primary pumps, variable speed secondary pumps in 2005 » Five cooling towers with variable speed fans, constant speed condenser water pumps

7 San Diego Convention Center RetroCx Case Study SDCC Information 6 April 24, 2014 ACG Cx Energy 2014 » Seventy Six CAV / VAV Air Handling Units » All units are capable of 100% OSA economizer » CAV and VAV air terminal units with reheat » Three building automation systems » 1989 system for West building AHUs » 2001 system for East building AHUs » 2011 Tridium open platform integration » Wireless Lighting Control System for exhibit Halls was commissioned in late 2011

8 San Diego Convention Center RetroCx Case Study San Diego RCx Program 7 April 24, 2014 ACG Cx Energy 2014 » The San Diego Retrocommissioning Program » Funded by California utility customers » Administered by San Diego Gas & Electric Company (SDG&E®) under the auspices of the California Public Utilities Commission » Through a contract awarded to Portland Energy Conservation, Inc (PECI)

9 San Diego Convention Center RetroCx Case Study San Diego RCx Program 8 April 24, 2014 ACG Cx Energy 2014 The RCx Program is a retrocommissioning/recommissioning focused program. Through observation, targeted functional testing, and analysis of trend data, the Provider identifies deficiencies in the operation of the mechanical equipment, lighting, and related controls, and determines opportunities for corrective action and other operational and maintenance improvements that reduce energy consumption and demand. Take a bite out of your energy budget !!!

10 San Diego Convention Center RetroCx Case Study San Diego RCx Program 9 April 24, 2014 ACG Cx Energy 2014 » Who is Eligible? » To be eligible for RCx Program incentives, the building owner must commit funds to implement energy-saving measures that payback in two years or less after incentives are applied. The owner’s obligation is capped at 5% of the building’s annual electric cost. » Buildings that have an electric or natural gas account with SDG&E® » Buildings with at least 50,00 square feet of conditioned space usually served by one mechanical system and/or control system » Ideal building candidates have a central plant and direct digital controls (DDC)

11 San Diego Convention Center RetroCx Case Study San Diego RCx Program 10 April 24, 2014 ACG Cx Energy 2014 » Barriers to Retrocommissioning » Upfront (investigation) costs » Are there qualified Providers? » What is the value? » We don’t have time or budget for that! » What is covered for large venues? » Will existing system be able to handle the data points? » Completing the project without impacting business

12 San Diego Convention Center RetroCx Case Study San Diego RCx Program 11 April 24, 2014 ACG Cx Energy 2014 » The Program can alleviate barriers to RCx » Free Custom Engineering Study (No cost to Owner) » Provider Payments » Investigation: Up to $0.06 per conditioned square foot » Verification and Follow-up: Customized rate, estimated at $0.04 per implemented kWh, and $1.04 per implemented therm » Total: Average of $0.12 per conditioned square foot

13 San Diego Convention Center RetroCx Case Study San Diego RCx Program 12 April 24, 2014 ACG Cx Energy 2014 » Incentives for Owner’s » Owner’s choice of Program prequalified Providers » Implementation Incentives. The Program provides financial assistance to reduce payback periods for eligible measures. This implementation incentive, paid directly to the building owner, is $0.08 per kWh and $1.00 per therm, (equates to about $0.05 per square foot on average). » By addressing common but subtle operational problems, the Program can eliminate energy waste while improving the performance and increasing the life of your building’s systems. » Increases the value of the facility and enhance marketability, when you can prove how efficient the building is (cost per sf)

14 San Diego Convention Center RetroCx Case Study San Diego RCx Program 13 April 24, 2014 ACG Cx Energy 2014 » Typical eligible measures under the Program » HVAC » Lighting » Domestic Hot Water » Miscellaneous Pumps (booster pumps, fountains, etc.) » Building Envelope (except measures that would require a permit, such as replacing all the windows in a building) » Refrigeration

15 San Diego Convention Center RetroCx Case Study San Diego RCx Program 14 April 24, 2014 ACG Cx Energy 2014 » Items and measures which are excluded for the Program » Lamp, ballast, fixture replacements » Replacement of existing motors with premium efficiency motors » Major plant or distribution conversions » Short-term routine maintenance items, such as filter changes, lubrication and fan belt adjustments. However, changing the type of filtration is an eligible measure. » Measures that don’t save energy; however, recommendations uncovered during the investigation that improve other items (e.g. IAQ, equipment life) should be indicated in the report. » If previous modifications within the last 5 years carried out utilizing utility incentives, then similar measures are not eligible. » Ongoing modifications may postpone RCx efforts

16 San Diego Convention Center RetroCx Case Study San Diego RCx Program 15 April 24, 2014 ACG Cx Energy 2014 » The goal of the Program is to implement the following types of measures: » Fix problems with existing controls » Enhance the control and operation of existing equipment » Make repairs or upgrades to existing equipment to make it run more efficiently (& deferred maintenance – steam traps) » Educate the building operations staff on the most efficient manner in which to operate the building.

17 San Diego Convention Center RetroCx Case Study San Diego RCx Program 16 April 24, 2014 ACG Cx Energy 2014 » Four Primary Phases in the Program » Screening » Investigation » Implementation » Verification of Savings / Follow-up

18 San Diego Convention Center RetroCx Case Study RCx Program: Screening Phase 17 April 24, 2014 ACG Cx Energy 2014 » RCx Program Screening On-site Form » Information completed by Program and building representatives » Contains sample questions and information about the building and systems » Establishes a starting point to focus investigation » San Diego Convention Center Screening completed on May 17, 2007

19 San Diego Convention Center RetroCx Case Study RCx Program: Investigation Phase 18 April 24, 2014 ACG Cx Energy 2014 » Kick-off Meeting » Conducted at the outset of the investigation » Ensures all stakeholders are clear about Program process expectations and team roles. » One Month Check-In » At the one month point of RCx investigation the Provider develops and submits a Preliminary List of Findings (PLF) and assessment of the building’s BAS. » Summarizes the progress of the investigation to date » Detailed calculations not required at this point (rules of thumb and experience) » Projects viability is reviewed » San Diego Convention Center preliminary investigation completed May 2009 and project was put on hold to complete a scoping study (stakeholder proof)

20 San Diego Convention Center RetroCx Case Study 19 April 24, 2014 ACG Cx Energy 2014 FREE Energy projects Facility Retrofits in Energy Efficiency These projects were funded by the local public utility (SDG&E) Replacement of five natural gas chillers (3,600 tons) with three new electric high-efficiency centrifugal chillers (2,400 tons) while improving comfort and energy efficiency - Cost $4,067,500 (delivered $113,000 under budget) Incentives of $467,769 from SDG&E - 2,887,836 kWh - $433,159 saved annually Operation of chilled water loop as thermal energy storage system to cool electrical and storage rooms - Cost $3,645 (programming only) - 710,850 kWh - $64,687 saved annually (good example of fine tuning, 2.9 week ROI) Other Recent SDCC Projects

21 San Diego Convention Center RetroCx Case Study 20 April 24, 2014 ACG Cx Energy 2014 FREE Energy projects Facility Retrofits in Energy Efficiency Installation of real time energy meters providing consumption data, demand and power quality – Cost $26, KW demand reduction $19,733 saved during 9 events the first year Retrofit Exhibit Hall Hi-bay HID fixtures with fluorescent fixtures and wireless controls – Cost $353,278 – 1,299,041 kWh - $210,939 saved annually Installation of Vending Misers on all facility machines – Cost $2, ,054 kWh - $2,708 saved annually Retrofit our IT computer room with virtual servers – Cost $7, ,826 kWh - $1,324 saved annually Other Recent SDCC Projects

22 San Diego Convention Center RetroCx Case Study RCx Program: (Re)Investigation Phase 21 April 24, 2014 ACG Cx Energy 2014 » Green Building Services was contracted as the Provider to recommence the RCx Program for SDCC in December 2010 » Reviewed all project documentation, conducted kick-off meeting, recommenced investigation from the beginning » Investigation » December 2010 through September 2011 » Utilized BAS trend data, stand-alone data loggers and observations to develop baseline data that demonstrates the problem or opportunity » Summarizes the investigation in the Program’s Findings Workbook (FWB)

23 San Diego Convention Center RetroCx Case Study RCx Program: Investigation Phase 22 April 24, 2014 ACG Cx Energy 2014 » Investigation » Master List of Findings (MLF) and Investigation Report » Complete set of measures identified » Energy savings calculations, estimated costs, and simple payback calculations » Submitted for review and approval by the Program

24 San Diego Convention Center RetroCx Case Study RCx Program: Investigation Phase 23 April 24, 2014 ACG Cx Energy 2014 » Investigation » Approval of the FWB, Investigation Report and associated documentation » Provider presents investigation results » Assist building staff in selecting measures for implementation » Required RCx Measures (2 years or less payback) » Recommended RCx Measures (exceed 2 year payback) » Documentation used to move the project into implementation phase

25 San Diego Convention Center RetroCx Case Study RCx Program: Implementation Phase 24 April 24, 2014 ACG Cx Energy 2014 » Implementation » Owner and team implements measures selected » Provider updates documentation for implemented measures » Program and utility review and approve verification data » SDCC Implementation and verification: September 2011 through September 2012 » Follow-up / Hand-off » Provider delivers final report » Provider and appropriate team members provide training » Persistence Plan now included in Final Report for each measure

26 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Implemented Measures 25 April 24, 2014 ACG Cx Energy 2014 » Measure 2: East AHUs Fan Modification » Constant volume/constant speed AHUs (VFDs for balancing only) » Serve large entry areas and corridors outside of Assembly Halls and Meeting Rooms » Modify operations of 16 AHUs » Completed September 2012 » Implementation Cost: $10,466 » Implemented Energy and Cost Savings: 239,654 kWh and 29.5 kW, or $21,940 (0.5 year payback) Non-energy impacts: The lobby areas are quieter and less drafty when there is low demand in the space. Connection to a newer graphics package allows improved trending, scheduling, more reliable response to user complaints and general improved operations and troubleshooting through newer graphics and improved sequence of operations.

27 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Implemented Measures 26 April 24, 2014 ACG Cx Energy 2014 » Measure 3: VFD and Controls Upgrade for Assembly Hall AHUs » Constant volume/constant speed AHUs (high run time hours) » No trending or scheduling capabilities » VFD retrofit and modify operations of 12 AHUs » Completed September 2012 » Implementation Cost: $498,690 » Implemented Energy and Cost Savings: 1,293,965 kWh and 178 kW, or $118,890 AND 7,257 therms, or $5,547 (4 year payback, 3.1 w/incentives) Non-energy impacts: The Assembly Halls are less drafty during non-peak demand. New Controllers for these units provides improved trending, scheduling, more reliable response to user complaints and general improved operations and troubleshooting through newer graphics and improved sequence of operations.

28 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Implemented Measures 27 April 24, 2014 ACG Cx Energy 2014 » Measure 4: AHU-15 and AHU-16 Fan Modification » Constant volume/constant speed AHUs (VFDs for balancing only) » Modify operations of the 2 AHUs » Completed September 2012 (programming was still occurring at hand-off) » Implementation Cost: $16,132 » Implemented Energy and Cost Savings: 17,400 kWh and 2.45 kW, or $1,600 (estimated savings not fully realized-full programming not complete) Non-energy impacts: New Controllers for these units provides improved trending, scheduling, more reliable response to user complaints and general improved operations and troubleshooting through newer graphics and improved sequence of operations.

29 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Implemented Measures 28 April 24, 2014 ACG Cx Energy 2014 » Measure 5: AHU-45 Leaking Valve and Unstable SAT Control » Cooling coil control valve leaked when shut and control loop tuning unstable » Repaired the leaking valve and tuned the SAT control loop » Completed September 2012 » Implementation Cost: $269 (not including in-house work) » Implemented Energy and Cost Savings: 4,922 kWh, or $432 AND 763 therms, or $583 (0.3 year payback) Non-energy impacts: Enhanced occupant comfort and increased heating and cooling plant capacities by reducing waste/inefficiency.

30 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Implemented Measures 29 April 24, 2014 ACG Cx Energy 2014 » Measure 7: AHU-70 Leaking Valve and Unstable SAT Control » Cooling coil control valve leaked when shut and control loop tuning unstable (heating coil was manually shut off) » Repaired the leaking valve and tuned the SAT control loop » Completed September 2012 » Implementation Cost: $269 (not including in-house work) » Implemented Energy and Cost Savings: 22,481 kWh, or $2,010 (0.1 year payback) Non-energy impacts: Enhanced occupant comfort and increased heating and cooling plant capacities by reducing waste/inefficiency.

31 San Diego Convention Center RetroCx Case Study SDCC RCx Program: Non-Implemented Measures 30 April 24, 2014 ACG Cx Energy 2014 » Measure 1: AHU-19 Economizer Control » AHU-19 did not provide full economizer when conditions allowed » Damper operation corrected and re-programming was implemented and checked however, post-installation data was not sufficient to prove successful implementation. » Measure 6: AHU-55 Leaking Valve and Unstable SAT Control » Cooling coil control valve leaked when shut and control loop tuning unstable » Excessive estimated payback.

32 San Diego Convention Center RetroCx Case Study SDCC RCx Program Measures Summary 31 April 24, 2014 ACG Cx Energy 2014 Measure ID Electric Savings (kWh) Demand Savings (kW) Gas Savings (Therms) Energy Cost Savings ($) Implementation Cost ($) Simple Payback (Years) 2239, $21,939$10, ,293, ,257$124,437$498, , $1,600$16, , $1,015$ ,48100$2,010$ Total1,578, ,020$151,002$525,8273.5

33 San Diego Convention Center RetroCx Case Study 32 April 24, 2014 ACG Cx Energy 2014 SDCC Energy Utilization Index Over the Years

34 San Diego Convention Center RetroCx Case Study 33 April 24, 2014 ACG Cx Energy 2014 Lessons Learned / Opportunities » GBS as the Provider » Substantial savings identified, implemented and verified despite limited project scope (AHU systems only) » Importance of articulating cost benefit of project - value » PECI as the Program » Recognize risk of installing/using newly developed software to aid in investigation—this idea was ultimately scrapped but caused delays » Good idea to have a scoping report or preliminary list of findings developed early on in the investigation with all projects big and small » San Diego Convention Center » Impact of control modifications on other systems (lighting & Fire System) » Under estimated time commitment needed to verify goals were achieved

35 San Diego Convention Center RetroCx Case Study 34 April 24, 2014 ACG Cx Energy 2014 In Conclusion » Green Building Services » Don’t be afraid to take risks (calculated) » Know the project teams level of commitment and history performance » Access incentives whenever possible - is often a deal breaker if not available » San Diego Convention Center » Don’t underestimate the value of team work on a project of this size ( Members of the team must be motivated to work together by using each other's strengths to benefit the mission ) » Focus on achieving one goal at a time ( Champions don't become champions in the ring - they are merely recognized there ) » The old formula for success still works today: Competence + Character + Connection = Achieving your goals

36 San Diego Convention Center RetroCx Case Study 35 Questions?

37 Thank You Ted Spear, P.E., LEED AP O+M Associate Principal Mitchell Chvilicek, P.E., LEED AP BD+C, CxA Senior Commissioning Consultant GBS would like to thank Ron Barham the Building Superintendent at the San Diego Convention Center and the facilities staff for their assistance with developing this presentation and their active participation in the Retrocommissioning Program. Special thanks to David Peery, the Program Outreach Manager with PECI for his assistance and expertise.

38 San Diego Convention Center RetroCx Case Study 37 April 24, 2014 ACG Cx Energy 2014 Useful Links San Diego Convention Center SDG&E RCx program ComEd (Chicago Utility) has an RCx and Monitoring-based Commissioning Program https://www.comed.com/business-savings/programs-incentives/Pages/default.aspx New York (NYSERDA Flex Tech Program which includes RCx) California Commissioning Collaborative


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