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Fundamentals of
Retro-Commissioning
Tom MeyerCSME, GGP, CBCP, QCP, EBCP
The ESCO Group
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Fundamentals of Retro-Commissioning
Fundamentals of Commissioning Existing Buildings
Fundamentals of Optimizing Existing Buildings
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Purpose of Retro-Commissioning
Optimization of Existing Buildings
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Why Existing Buildings?• Lots of existing buildings• All have opportunities • Benefits range from less
than a month to a year economic payback
• Helps identify capital and rehab projects with economic payback from one to 20 years.
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Not ALL Buildings are Candidates
If there is no functional use and you want to save energy – close the building down.
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Flavors of Commissioning
• New Construction Commissioning• Re-Commissioning• Continuous
Commissioning• Retro-
Commissioning
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Defining Retro-Commissioning
Q: What does “retro-commissioning” mean?1. Returning out of spec equipment back to original
design.2. Commissioning a building again after several
years since it was commissioned as new construction.
3. Commissioning a building never before commissioned to the owner’s current requirements.
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Limited in Scope
Most retro-commissioning programs are limited in scope. – System– Equipment– Problem
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Motivation
The Building Owner’s motivation is the determining factor of scale and depth of the commissioning process.
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Nuts and Bolts of Cx
• Benefits of Retro-Commissioning• Process of Retro-Commissioning• Commissioning Methods• Types of Commissioning
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Top 10 Retro-Cx Measures
10. Improve boiler efficiency/controls 9. Reset supply static pressure setpoint 8. Review terminal unit operation 7. Return VFD to variable speed operation 6. Lower condenser water temperature
Courtesy of San Diego Energy Office
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Top 10 Retro-Cx Measures
5. Calibrate sensors and instrumentation 4. System level and balance 3. Optimize economizer operation 2. Eliminate simultaneous heating & cooling 1. Turn off equipment when not needed
Courtesy of San Diego Energy Office
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Confused?
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Get Professional Help!
Any successful commissioning plan starts with the right people led by a person with the proper training and experience.
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QUESTIONS?