Innovative thermoeconomic diagnosis of multiplefaults in air conditioning units: Methodologicalimprovements and increased reliability of results

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Abstract

Thermoeconomic faults diagnosis of air conditioning units is a pioneeristic approach to detect single or multiple faults and quantify their impact in terms of additional energy consumption. The poor reliability of conventional thermoeconomic approaches has beenlimiting the interest for practical applications of this technique. In this paper an improved thermoeconomic diagnosis is proposed and applied to a reference 120 kWc air-cooled airconditioning system; a simulator is used to evaluate thermodynamic data under normal and faulty conditions. Four faults are individually or simultaneously imposed: fouling atcondenser and evaporator, refrigerant undercharge and compressor valve leakage. For setting up the diagnostic tool only a few numerical or experimental tests are required; theresults testify the procedure to be sufficiently reliable both when heavy or light faults are considered. Also, the performance of the diagnostic procedure slightly improves when theeffects of “system level” faults like refrigerant undercharge are preliminarily filtered.
Lingua originaleEnglish
pagine (da-a)2343-2365
Numero di pagine23
RivistaInternational Journal of Refrigeration
Volume36
Stato di pubblicazionePublished - 2013

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All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

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