Generalized effects of faults on normalized performance variables of air conditioners and heat pumps

Mehdi Mehrabi, David Yuill

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


The effects of several types of faults on air conditioners and heat pumps have been studied in many laboratory experiments. All available data have been gathered, and the independent variable (fault intensity) and each of the dependent variables (fault impacts) are normalized to show the trends in a generalized fashion. Relationships are provided wherever there are sufficient results. Most of the significant fault types are included (except refrigerant charge variation, which was discussed in Mehrabi and Yuill (2017)): condenser heat transfer (CA), evaporator heat transfer (EA), liquid line restriction (LL), compressor leakage (VL), and non-condensables in the refrigerant (NC). Relationships are presented separately for fixed orifice and thermostatic expansion valve equipped systems. The variation level in the results indicates that in many cases, the generalized relationships provide reasonable predictors of fault effects on systems for which laboratory test results are unavailable. These relationships provide the first generalized fault effect models for air conditioners and heat pumps.

Original languageEnglish (US)
Pages (from-to)409-430
Number of pages22
JournalInternational Journal of Refrigeration
StatePublished - Jan 2018


  • Air conditioner
  • Fault
  • Generalized effect
  • Heat pump

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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