Commissioning for Energy Savings

Transcription

1 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 Better Performing

2 Introduction Rebecca Ellis Mechanical Engineer (HVAC & Controls) Evolved from Design to Commissioning Passion for High Performance Building Systems Operations President of Questions & Solutions Engineering

3 Agenda Commissioning Overview Energy Conservation Projects Case Studies Preparing for Sustained Energy Savings Post-Project Operations

4 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.

5 Commissioning Overview Commissioning is Always: Documentation Testing Training

6 Energy Conservation Projects Energy Conservation Retrofits Control System Replacements/Upgrades Major Renovations and/or New Construction

7 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

8 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

9 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

10 Case Studies Warehouse - Design Gas-fired heating-only air turnover units Energy recovery ventilators with heating and dehumidification (CO-controlled)

11 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

12 Case Studies High Rise Condominium - Design Revised HVAC system controls

13 Case Studies High Rise Condominium - Findings Revised HVAC system controls Entire system forgotten Existing makeup air system dehumidification set point

14 Case Studies New School - Design Differential air flow building pressure control Energy recovery wheels with bypass dampers

15 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

16 Case Studies New Museum - Design Heat recovery chiller for summer reheat hot water

17 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

18 Case Studies New Office Building - Design Network lighting control system for all spaces (no manual light switches)

19 Case Studies New Office Building - Findings Network lighting control system Lighting control system not programmed

20 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

21 Preparing for Sustained Energy Savings Documentation (from the Project for Operations) Schematic diagrams

22 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

23 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

24 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

25 Post-Project Operations Preventive Maintenance is Always Required All equipment maintenance activities Control system sensor calibrations Control system device operational checks Accessibility is key!

26 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

27 Discussion Rebecca Ellis