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Automated Centrifugal Chiller Diagnostician

Pacific Northwest National Laboratory

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Centrifugal chiller display
Centrifugal chiller display

Typical diagnostic display
Typical diagnostic display

Technology Marketing Summary

Researchers and engineers at PNNL have developed an automated, sophisticated, multi-level, real-time centrifugal chiller diagnostician with diagnostics available under partial load conditions. This diagnostician provides auto-analysis of system efficiency and diagnoses the most probable causes of centrifugal chiller operations caused by common failures. It provides a generic diagnostic tool applicable to most major brands of centrifugal chiller units.


Unique features include:

  • applied a polynomial function generator to support partial load diagnostics rather than just full load diagnostics (industry standard)
  • event analysis and counter
  • event based data logging
  • innovative TCP/IP data acquisition for string type data
  • improved OPC communications
  • advanced intuitive GUI
  • diagnostic factory-engineered curve fit algorithms for a centrifugal chiller
  • ability to interpret string data (text messages) for faults vice just numerical data
  • automated, real-time diagnostics in visual display that identifies most probably causes of inefficiencies centrifugal chiller operations
  • applicable to most major brands of centrifugal chiller units
  • wide range of information can be monitored and displayed providing information about most common failures
Applications and Industries

Potential applications in:

  • aerospace & defense
  • automotive & transportation
  • chemicals
  • energy & utilities
  • oil & gas
More Information

This technology is protected under copyright granted through the U.S. Copyright Office.

Technology Status
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To: Jennifer Hodas<>