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    Facility Bio

    • Charlotte, NC
    • 26,000 students
    • Utility plant with 4,350 ton cooling capacity
    • 2 separate variable speed distribution loops
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    • University taps Ameresco for comprehensive campus energy performance contract
    • Traditional Primary-Secondary design with typical inefficiencies:
      • low ΔT
      • high system pressure
      • high kW/ton
    • Multiple chiller sizes created flow imbalance during transitions
    • Existing Schneider BAS with standard control sequence;  no optimization
  • Solution

    • Convert plant to Integrated Primary-Secondary® configuration to eliminate flow problems
    • Install VFDs on primary pumps to match  secondary loop flow and accommodate different chiller pressure drops
    • Integrate supervisory configuration of tekWorx CEO® with Schneider BAS; physical I/O remained in place
    • Establish VPN connection for remote monitoring and maintenance support

Results That Exceed Client Expectations

  • Financial Results

    • $71,000 in annual energy savings
    • 3-year project payback
  • Energy Impact

    • 1,100,000 kWh saved annually
    • .26 kW/ton efficiency improvement
  • Operational Benefits

    • Equipment operates at most efficient point, reducing wear and tear
    • Operators freed up for other tasks
    • Improve maintenance and troubleshooting support

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