• Case Study Icons-10

    Facility Bio

      • Irvine, CA
      • Three variable speed chillers and two constant speed chillers totaling 6,300 tons capacity
      • Distributed campus load with five secondary cooling zones
      • 11.5 cents blended utility rate
  • Case Study Icons-08


    • Installed capacity not achievable due to hydronic issues, load shedding required on high wet bulb temperature days
    • Enthalpy-driven cooling load
    • Chillers run when outdoor air could meet space temperature and RH requirements
    • Modifications over time created system and equipment imbalances
    • BAS control system functional, but did not provide optimization
  • Solution

    • Convert to full variable flow operation
    • Integrate supervisory Control Engine Optimization (CEO®) with existing BAS
    • Reset CHW supply temperature based on enthalpy
    • Efficiency-based chiller sequencing to improve utilization and performance
    • Reset zone DP setpoints to minimize flow and pump power

Results that exceed client expectations

  • Financial Savings

    • $542,000 annual utility cost savings
    • $250,000 utility rebate
    • Just under a 6-month payback with the rebate
  • Energy Impact

    • >4,700,000 kWh saved annually
  • Operational Benefits

    • Improved automation means less manual intervention
    • Improved CHW temperature control reduces reheat load and cost
    • Improved equipment utilization increases system redundancy

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