Commissioning for Energy Savings - MN...
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Better Performing Commissioning for Energy Savings Presented To: AEE / ASHRAE / USGBC 2013 Energy Expo St. Paul RiverCentre, St. Paul, Minnesota October 2, 2013 Presented By: Rebecca T. Ellis, PE LEED AP BD+C, CCP, CPMP CxA President, Questions & Solutions Engineering
Transcript of Commissioning for Energy Savings - MN...
Better Performing Buildings™
Commissioning
for Energy Savings
Presented To:
AEE / ASHRAE / USGBC
2013 Energy Expo
St. Paul RiverCentre, St. Paul, Minnesota
October 2, 2013
Presented By:
Rebecca T. Ellis, PE
LEED AP BD+C, CCP, CPMP CxA
President, Questions & Solutions
Engineering
Introduction
Rebecca Ellis
• Mechanical Engineer (HVAC & Controls)
• Evolved from Design to Commissioning
• Passion for High Performance Building Systems Operations
• President of Questions & Solutions Engineering
Agenda Commissioning Overview
Energy Conservation Projects
Case Studies
Preparing for Sustained Energy Savings
Post-Project Operations
Commissioning Overview
What is Commissioning?
Systematic process of assuring by
verification and documentation, from the
design phase to a minimum of one year
after construction, that all building facility
systems perform interactively in
accordance with the design documentation
and intent, and in accordance with the
owner’s operational needs, including
preparation of operation personnel.
Commissioning Overview
Commissioning is Always:
• Documentation
• Testing
• Training
Energy Conservation Projects
Energy Conservation Retrofits
Control System Replacements/Upgrades
Major Renovations and/or New
Construction
Energy Conservation Projects
Other Topics Today
• Energy Efficiency as an Investment: The Value of Investing in Energy Efficiency at your Facility
• Innovative Systems for Energy and Water Conservation
• Large Chiller Plant Optimization
Energy Conservation Projects
Building Owner Chooses to Invest $$$
in Anticipation of Saving Energy $$$
Long Term
• New types of equipment
• New types of control strategies – more points, more programming
• New types of instrumentation
• Integration of all of the above
Energy Conservation Projects
Third Party Commissioning is a Smaller
$ Investment to Confirm Intended
Energy Savings will be Achieved
• Set points
• Operating schedules
• Sensor calibration
• Control sequence verification
Case Studies
Warehouse - Design
• Gas-fired heating-only air turnover units
• Energy recovery ventilators with heating and dehumidification (CO-controlled)
Case Studies Warehouse - Findings
• Gas-fired air turnover units
Occupied and unoccupied temperature set points higher than design
Occupied time schedule longer than needed
• Energy recovery ventilators with heating and dehumidification (CO-controlled)
Heating discharge air temperature 78F instead of 50F
Cooling discharge air temperature 55F instead of 59F
Exhaust air intakes blocked
Case Studies
High Rise Condominium - Design
• Revised HVAC system controls
Case Studies
High Rise Condominium - Findings
• Revised HVAC system controls
Entire system forgotten
Existing makeup air system dehumidification set point
Case Studies
New School - Design
• Differential air flow building pressure control
• Energy recovery wheels with bypass dampers
Case Studies
New School - Findings
• Differential airflow building pressure control
Missing return airflow measuring stations
• Energy recovery wheels with bypass dampers
Bypass damper around wheel and heating and cooling coils
Case Studies
New Museum - Design
• Heat recovery chiller for summer reheat hot water
Case Studies
New Museum - Findings
• Heat recovery chiller for summer reheat hot water
Reheat coils not sized for the low temperature hot water generated by the heat recovery chiller
Case Studies
New Office Building - Design
• Network lighting control system for all spaces (no manual light switches)
Case Studies
New Office Building - Findings
• Network lighting control system
Lighting control system not programmed
Preparing for Sustained Energy
Savings
Documentation (from the Project for
Operations)
• Operational intent
Space conditions
Light levels
Operating schedules
Seasonal differences
Why the systems were designed the way they were
Preparing for Sustained Energy
Savings
Documentation (from the Project for
Operations)
• Schematic diagrams
Preparing for Sustained Energy
Savings
Documentation (from the Project for
Operations)
• Sequences of operation
• Description of interactions between systems
HVAC
Fire alarm
Lighting controls
Security
Preparing for Sustained Energy
Savings
Documentation (from the Project for
Operations)
• As-built plans showing component locations
All equipment
Manual shut-off valves
Smoke/fire dampers
Control system dampers & valves
Control system sensors
Post-Project Operations
On-going Operations
• Buildings do not run themselves (even if they have computers)
• Day-to-day operations look different in sustainable buildings
Post-Project Operations
Preventive Maintenance is Always
Required
• All equipment maintenance activities
• Control system sensor calibrations
• Control system device operational checks
• Accessibility is key!
Post-Project Operations
Avoiding Trouble Calls • Monitoring & trending
• Proactive data analysis
Use data to discover trouble spots before the occupants do
Analyze data clues to understand the root causes that need to be addressed
Identify wasted energy not otherwise detected
• Smart alarms
