• Case Study Icons-10

    Facility Bio

    • Johnson City, TN
    • 16,600 students
    • 4 chillers, various sizes and types serving single campus distribution loop of 32 buildings
    • 4,800 tons cooling
  • Case Study Icons-08

    Situation

    • Ameresco selected as Performance Contractor for east Tennessee region by Board of Regents
    • Primary-Secondary system with typical inefficiencies:
      • low ΔT
      • high system pressure
      • high kW/ton
      • running chillers for flow rather than cooling
    • Varying loop interface and pumping configurations
    • Existing JCI Metasys with standard sequence, no optimization sequence
  • Solution

    • Convert system to Integrated Primary-Secondary® configuration with modulating bypass valve to eliminate blending and raise ΔT
    • Eliminate bypassing in building interfaces
    • Install VFDs on buildings with intermittent high loads
    • Install VFDs on condenser pumps and cooling tower fans
    • Replace Metasys CPU and I/O with tekWorx CEO®
    • Establish VPN connection for remote monitoring and maintenance support

Results That Exceed Client Expectations

  • Financial Results

    • $70,000 in annual energy savings
    • 2.5-year project payback
  • Energy Impact

    • 1,400,000 kWh saved annually
    • .24 kW/ton efficiency improvement
  • Operational Benefits

    • Improved reliability during high load periods
    • Consistent building interfaces reduce system pressure

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