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Analyse critique des approches thermoéconomiques classiques du diagnostic des anomalies multiples des systèmes de conditionnement d'air : capacités, inconvénients et orientations visant l'amélioration. Etude de cas d'un système refroidi par air avec une puissance de 120 kW.

Critical analysis of conventional thermoeconomic approaches to the diagnosis of multiple faults in air-conditioning units: capabilities, drawbacks and improvement directions. A case study for an air-cooled system with 120 kW capacity.

Auteurs : PIACENTINO A., TALAMO M.

Type d'article : Article, Article de la RIF, Étude de cas

Résumé

Faults diagnosis in air-conditioning systems is a crucial activity, since malfunctions may induce heavy degradation of performance. Among the available techniques, thermoeconomic diagnosis has played a marginal role due to the difficulties encountered when applying the methodology to refrigeration plants. In this paper a critical analysis on capabilities and limits of thermoeconomic diagnosis is proposed. The reference plant is a 120 kWc air-cooled air conditioning system; a simulator is used to evaluate thermodynamic data under normal and faulty conditions, setting up “virtual experiments” to simulate each fault. Five malfunctions are imposed, either individually or simultaneously: fouling at condenser and evaporator, refrigerant undercharge, compressor valve leakage and extra-superheating along suction line. From a qualitative viewpoint, the examined approach resulted efficient in identifying some faults, although false fault signals eventually emerged. Methodological improvements were suggested, to make thermoeconomic diagnosis capable of quantifying the additional energy consumption provoked by any specific fault.

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Format PDF

Pages : 24-44

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    20 €

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    Gratuit

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Détails

  • Titre original : Critical analysis of conventional thermoeconomic approaches to the diagnosis of multiple faults in air-conditioning units: capabilities, drawbacks and improvement directions. A case study for an air-cooled system with 120 kW capacity.
  • Identifiant de la fiche : 30006429
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 36 - n. 1
  • Date d'édition : 01/2013

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