The Case for: Building Retro (& Re) Commissioning Recommissioning_0.pdf · The Case for: Building...
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Transcript of The Case for: Building Retro (& Re) Commissioning Recommissioning_0.pdf · The Case for: Building...
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Learning Objectives
What is it?
Why do it?
How to do it?
Probable Results…………………….
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What is:Commissioning / Retro and Re-Commissioning?
Building Commissioning is a quality control process that ensures that a new building will operate the way the owner intended.
Retro-Cx is the documented process of commissioning an existing building.
Re-Cx is the process of commissioning a building which has previously been commissioned.
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What is:Commissioning / Retro and Re-Commissioning?
Investment opportunity
Payback Widget
Energy Project
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What is:Commissioning / Retro and Re-Commissioning?
Goals
Obtain and verify energy savings
Identify improvement to operations
Recommend future capital projectsGoal Setting Charrette
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Re/Retro-CommissioningWhy do it?:
Energy and Cost Savings
Improved Comfort and Productivity
Better IAQ
Better Trained Staff
Increase Equipment and System Life
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Re/Retro-CommissioningWhy do it?:
Low Cost
Low Beta (Risk)
High return on investment
Single-most cost-effective way to save energy
“Stealth” Strategy
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Re/Retro-Commissioning
1. Identify a building
Expensive to operateOlderDDCPoor comfort conditionsPoor IAQHigh Maintenance
How To Do It
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Re/Retro-Commissioning
2. Get a Commissioning Agent
ConsultantEngineer“Commissioning Agent”Owner staff?BMS Controls Vendor
How To Do It
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Re/Retro-Commissioning
3. Develop a Plan………….
Document current conditionsCurrent operations
How To Do It
Implement Findings
Verify Savings
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Re/Retro-Commissioning
How to Optimize Your PaybackUse in-house talent and knowledge
ReCx performed using experienced, knowledgeable, engaged building staff is most likely to produce long lasting results and provide the greatest payback.
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Re/Retro-Commissioning
How to Optimize Your PaybackUsing in-house personnel
Gather building informationAssist in trending and testingBuilding evaluationsShort term monitoringSimple repairsBMS manipulation
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Re/Retro-Commissioning
How to Optimize Your Payback
Diagnostic MonitoringBMS Trending / data loggersPerform in all modes of operation and conditions
temperaturesflow ratespressures
Analysis and determine root causeRe-baseline (Building Performance Capabilities)
Stuff We Find
ScheduleAlarm logsOverridesSequence enhancements
• Critical zone reset• Supply air reset• Single Zone VAV
Calibrations Low Delta TSupply fan VFD at 0% but unit SP is 3.6”. VFD in
Hand. Economizer disabled. No min OSA set point but OSA dampers at 25%.
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Stuff We Find
Unit running at 100% at warmup SA temp only 63Unit running in economizer mode with space temp
79VAV box damper at 84% with 0 cfmSpace set point 69 space temp 61AHU unable to reach SP set pointUnit not in graphicsUnits not mapped properly in graphicsPoor central plant start/stopNo VAV box max or mins 18