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A methodology for diagnosing multiple simultaneous faults in vapour-compression air conditioners.

Author(s) : LI H., BRAUN J. E.

Type of article: Article

Summary

Existing methods addressing automated fault detection and diagnosis (FDD) for vapour-compression air-conditioning equipment have good performance for faults that occur individually but have difficulty handling multiple simultaneous faults. In addition, these methods either require high-cost measurements or measurements over a wide range of conditions for training reference models, the development of which can be time consuming and cost prohibitive. This paper formulates model-based FDD in a generic way and demonstrates that decoupling is the key to handling multiple simultaneous faults. To eliminate a cost-prohibitive overall system model, an alternative physical decoupling methodology to mathematical decoupling is developed. During the mathematical development, a previously developed FDD method termed the statistical rule-based method is reexamined and cast within the general mathematical framework. The paper also includes an evaluation of the FDD method in terms of both sensitivity and robustness.

Details

  • Original title: A methodology for diagnosing multiple simultaneous faults in vapour-compression air conditioners.
  • Record ID : 2007-2739
  • Languages: English
  • Source: HVAC&R Research - vol. 13 - n. 2
  • Publication date: 2007/03

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