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A robust model-based approach to diagnosing faults in air-handling units.

Author(s) : NGO D., DEXTER A. L.

Summary

The diagnosis is based on a semi-qualitative analysis of the measured data using generic fuzzy reference models to describe the behaviour of the equipment, with and without faults. The scheme is applied to the cooling-coil subsystem of an air-handling unit, and the sensitivity of the diagnosis to sensor bias and fault size is examined. The results of the diagnosis are compared to those obtained using reference models that describe the behaviour of a specific design. It is concluded that the accuracy of sensors currently used means it is likely that only large faults can be detected in practice and that more accurate measurements are required if a higher level of fault sensitivity is needed.

Details

  • Original title: A robust model-based approach to diagnosing faults in air-handling units.
  • Record ID : 2000-2089
  • Languages: English
  • Source: ASHRAE Transactions. 1999 Winter Meeting, Chicago, Illinois + CD-ROM.
  • Publication date: 1999
  • Document available for consultation in the library of the IIR headquarters only.

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