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PERFORMING EFFECTIVE BUILDING SYSTEM
RECOMMISSIONING STUDIES
Joseph J. Watson, P.E.Booth # 312
Commissioning - Follows construction process from pre-
design through construction and acceptance. A systematic process of ensuring that all building systems perform interactively according to the contract documents, the design intent and the owner’s operational needs.
Definitions
E3 DESIGNS
Re-commissioning - Occurs after construction as an
independent process usually focusing on energy using equipment. Systematically optimize existing building systems to function according to the criteria set forth in the original project documents
Definitions
E3 DESIGNS
Retro-commissioning - A systematic process for optimizing all
building systems by improving their operation and maintenance to ensure their performance meets the owner’s current facility requirements.
Definitions
E3 DESIGNS
Continuous Commissioning - Registered trademark at Texas A&M.
Focuses on continuously monitoring HVAC operation and control to maintain long term savings through improved system reliability and building comfort
Definitions
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy waste
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy waste
Reduces maintenance costs and premature equipment failure
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy waste
Reduces maintenance costs and premature equipment failure
Provides complete building benchmark
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy waste
Reduces maintenance costs and premature equipment failure
Provides complete building benchmarkProvides staff training to increase skill levels
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy waste
Reduces maintenance costs and premature equipment failure
Provides complete building benchmarkProvides staff training to increase skill levelsProvides budget support for capital planning
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
Identifies system operating, control, and maintenance problems
Improves efficiency and reduces energy wasteReduces maintenance costs and premature
equipment failureProvides complete building benchmarkProvides staff training to increase skill levelsProvides budget support for capital planning Ensures a healthy, comfortable, and
productive work environment
Benefits of Re-commissioning
E3 DESIGNS
E3 DESIGNS
HVAC/Control SystemsBuilding EnvelopeLighting SystemsElectrical SystemsWater SystemsRenewable Resources
Systems to be Re-Commissioned
E3 DESIGNS
Identify critical systems to be evaluated
Review control drawings and sequences of operation
Setup critical trend points in building EMS
Install independent data loggers to verify IAQ
Review operating information with building operatorsIdentify methods to improve system performance
Provide executive summary identifying low cost O&M changes and potential capital projects
Capital projects evaluated using Life Cycle Costing
Provide benchmark of annual energy use by system component
Provide verification of previous energy saving efforts
HVAC/Control Systems Assessment
E3 DESIGNS
Identify air leakage paths between indoor and outdoor including exterior doors, window joints, duct penetrations, interior doors, conduits passing through floors, elevator shafts, and roof vents
Assess the effects of building HVAC and stack effect pressures on air leakage characteristics
Evaluate possible air sealing measures to curtail uncontrolled air leakage and drafts
Determine financial justification of air sealing measures using Life Cycle Costing
Building Envelope Assessment
E3 DESIGNS
Survey existing lighting system in each space including:Location and use of spaceSurface type to determine reflectivityMeasure of actual lighting levels
Compare existing lighting levels with the current standards
Recommend a lighting retrofit that addresses photometric brightness, reducing glare, minimizes shadows, and reduces energy use and maintenance costs
Evaluate economic justification through life-cycle costing
Lighting System Assessment
E3 DESIGNS
Survey existing electrical components using non-invasive thermography
Evaluate existing components including:Assessment of current operating conditionsMaintenance and obsolescence concernsRemaining useful life
Generate a report which includes:Equipment locationColor thermal imageVisual imageDescription of evident problemRecommendations of corrective actions
Electrical System Assessment
E3 DESIGNS
Review two years billing information and compare to database of facilities of similar size
Perform a site survey to identify domestic fixture components in the domestic water system, building irrigation systems, and special use areas like kitchens and showers
Determine water usage related to building HVACCalculate total usage of domestic water,
irrigation, and HVAC and compare to actual usage to determine unaccounted water use
Recommend system upgrades that have been field proven
Evaluate recommendations based on Life Cycle Costing
Water System Assessment
E3 DESIGNS
Collect monthly energy use and cost Evaluate building site for renewable
resource applications including:Wind powerSolarGeothermal
Use computerized modeling software to evaluate renewable resource opportunities
Evaluate recommendations based on Life Cycle Costing
Renewable Resource Assessment
E3 DESIGNS
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