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Chiller Plant Control

Chiller Plant Control

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Chiller Plant Control

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  1. Chiller Plant Control

  2. Tracer Summit Chiller Plant Control • Standard Summit Application Program • Flexible to accommodate a variety of plant designs • Feature rich supports control strategies • Easy to understand user interface

  3. The Value in Chiller Plant Control

  4. Pre-engineered Features • Load determination • Capacity matching • Rotation • Chiller setpoint control • Failure recovery • User interface Reliable chilled water flow

  5. Load Determination (when to add or subtract a chiller) • Match plant capacity to building load • Run as few chillers as possible at optimal efficiency Matched Capacity => Reduce Operating Costs

  6. Load Determination • Constant or variable flow systems • Add logic • Based on Supply Temp and Chilled Water Flow • Operator editable delay times and deadbands • Subtract logic • Based on Supply/Return Water Temps or Bypass Flow (for large systems) and Chiller Capacities • Operator editable delay times and deadbands • Custom • Adaptable to suit customer specific algorithm requirements Reduce Operating Costs

  7. Add Example (Temperature) Add timer starts Chiller is added 47.5° 2.5° Add temp deadband Add timer reset 45° Add delay time (10 minutes) Chilled water supply temp System supply setpoint Prevents Unnecessary Cycling

  8. Subtract Example (Temperature) Chilled water delta temp 10° Subtract timer starts Chiller is subtracted Design delta temp 6.2° Subtract timer reset Subtract delta temp 0° Subtract delay time (20 minutes) Prevents Unnecessary Cycling

  9. Subtract Example (Flow) Subtract flow threshold Subtract timer starts Chiller is subtracted 1080 GPM 900 GPM Subtract timer reset Chiller design flow capacity Subtract delay time (20 minutes) Reduce Operating Costs

  10. Capacity Matching(turn the right chiller on) • Dependent on chiller plant design • Normal - identical chillers • Base - heat recovery / super efficient • Peak - back up / alternate energy source / inefficient • Swing - match the load ! • Custom - mix & match / nested CPC objects Reduce Operating Costs

  11. Rotation (which chiller leads) • Flexible for System Needs • Selected chiller types (Base / Normal) • Calendar based • Other system inputs • Run time based • Manual operator decision Reliable Chilled Water

  12. Current Limit Setpoint Control • Soft Start • Prevents excess capacity on “warm” starts • Pull down the system smoothly • Unload before start • Ride out flow transients during pump control • Variable flow / multiple pump systems • Low supply water temperatures Reduce Operating Costs

  13. Soft Start Example System chilled water supply temperature Chiller plant enabled in the soft start mode 65° Chiller plant transitions from soft startmode to normal mode 20° Soft start deadband 47.5° 2.5° Add temp deadband System supply setpoint 45° Reduce Operating Costs

  14. Failure Recovery keep chilled water flowing • Follow the standard sequence • Multiple failure inputs • Chiller level • System level • Editable time delays Reliable Chilled Water

  15. Diagnostics and Reports • Standard status reports • Diagnostic reporting and message routing Reduced Maintenance Cost

  16. User Interface • Easy to understand • Textual explanations • Graphical illustrations • Intuitive selections • Pre-engineered Reliable chilled water flow

  17. Reliable chilled water flow

  18. Take-aways • Standard Application Program • Flexible to accommodate a variety of plant designs • Feature rich supports control strategies • Easy to understand user interface

  19. Take-aways

  20. Plant Optimization The meter is on the building! Reduce Operating Costs

  21. Optimization - the meter is on the building! • Chiller selection • Tower control • Distribution pumping static pressure control • System soft loading • System setpoint selection • Humidity / comfort compensation Reduce Operating Costs

  22. Optimization - Chiller - Tower Control • Low limit • Protect the tower & chiller • Chiller - tower optimization • Real Time Calculations? • Move less air? • Pump less water? Reduce Operating Costs

  23. Preventive Maintenance • Regular data logging / interpretation • Operator training • Regular maintenance • Scheduled teardown inspections Reduce Maintenance Costs

  24. Top Three Considerations in Chiller Plant Control • Reduced Risk • Reliable chilled water flow • Operating cost (energy efficiency)

  25. Take Aways • Standard Application Program • Flexible to accommodate a variety of plant designs • Feature rich supports control strategies • Easy to understand user interface

  26. ...your systems company Chiller Plant Control