Real-time HVAC Performance Monitoring Techniques Developed during Retro-commissioning County of Los Angeles - ISD

1. 1 Real-time HVAC Performance Monitoring Techniques Developed during Retro-commissioningCounty of Los Angeles - ISD We welcome you all to the this session of “Sustainable Development & Energy Management”. Hope you had good lunch; and, it’s time to nap…not quite…me and colleague, Brian Roberts, are going to open this session by jointly presenting our experience with retrocommissioning of HVAC systems in existing buildings. We welcome you all to the this session of “Sustainable Development & Energy Management”. Hope you had good lunch; and, it’s time to nap…not quite…me and colleague, Brian Roberts, are going to open this session by jointly presenting our experience with retrocommissioning of HVAC systems in existing buildings.

2. 2 Why Building Tune-Ups?Typical Commercial Building Energy Use

3. 3 Adapted RCx Process And, the process was as orderly as it could be for an individual building – except that 11 buildings were in different phases at any given time. Utility bills were analyzed using Cal-Arch application during the Benchmarking phase to get Energy Utilization Index. During the Investigation Phase the RCx Provider rolled up their sleeves, got sub-contractors involved and tested every component of system for functionality. There was a lot of action in the field. Deficiency list was generated that was mostly handled by ISD crafts. By this time, RCx Provider had a pretty good idea about energy efficient measures required to produce energy savings. Energy savings potential was derived from running an energy model using eQUEST. Many EEMs were implemented by subcontractors hired by the RCx Provider. Systems were functionally tested using industry standard protocols. Training manual, specific to each facility, was developed and staff was trained in the field and in classroom setting. System-level benchmark for the purpose of sustainable savings is a major topic of this discussion and Brian will present it to you. And, the process was as orderly as it could be for an individual building – except that 11 buildings were in different phases at any given time. Utility bills were analyzed using Cal-Arch application during the Benchmarking phase to get Energy Utilization Index. During the Investigation Phase the RCx Provider rolled up their sleeves, got sub-contractors involved and tested every component of system for functionality. There was a lot of action in the field. Deficiency list was generated that was mostly handled by ISD crafts. By this time, RCx Provider had a pretty good idea about energy efficient measures required to produce energy savings. Energy savings potential was derived from running an energy model using eQUEST. Many EEMs were implemented by subcontractors hired by the RCx Provider. Systems were functionally tested using industry standard protocols. Training manual, specific to each facility, was developed and staff was trained in the field and in classroom setting. System-level benchmark for the purpose of sustainable savings is a major topic of this discussion and Brian will present it to you.

4. 4 HVAC RCx Measures Tested and calibrated all existing controls Improved Chiller Sequencing Chilled Water Reset Installed customized Purge Cycles Optimized Economizer Controls Optimized Start Installed Boiler Hot Water Reset Controls Installed Discharge Air Reset Controls Improved VAV Static Pressure Controls Performed Diagnostic Air and Hydronic Testing Selective air balancing and terminal box repairs Optimized Sequence of Operations The biggest that was accomplished during the retro-commissioning process was that most of the critical component level deficiencies were corrected. Sensors and related controls were calibrated and tested. At system level, we established improved chiller sequencing, added purge cycles, got economizers working again at many places. On airside, new discharge air temperature resets were implemented on cold and hot side for double-duct systems. Zone level test were conducted and select air balancing and terminal box repairs were performed. The biggest that was accomplished during the retro-commissioning process was that most of the critical component level deficiencies were corrected. Sensors and related controls were calibrated and tested. At system level, we established improved chiller sequencing, added purge cycles, got economizers working again at many places. On airside, new discharge air temperature resets were implemented on cold and hot side for double-duct systems. Zone level test were conducted and select air balancing and terminal box repairs were performed.

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6. 6 Public Library HeadquartersBefore RCx

7. 7 Public Library HeadquartersSimultaneous Heat/Cool

8. 8 Downey Courthouse Constant Hot/Cold Air Supply Temperatures

9. 9 Public Library Headquarters

10. 10 Public Library Headquarters

11. 11 Enterprise Energy Management Information System - EEMIS

12. 12 L A County EEMIS Network

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17. 17 System Level BenchmarksFrom EEMIS

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19. 19 System-level Benchmarking EEMIS UCE+ Example

20. 20 Baseline vs Actual - kWh

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23. 23 Public Library Headquarters  kWh Savings 2005 vs 2006

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26. 26 Additional EEMIS Features Greenhouse Gas Reporting Energy Star Benchmarking Canned Reports

27. 27 Next Steps Possible Collaboration Provide information (specs, agreements, scope) Provide technical support LA County’s Enterprise Energy System (EEMIS) Software can be shared with public agencies Needs integration with other building systems