Abstract
On Thermoeconomic Diagnosis of a Fouled Direct Expansion Coil: Effects of Induced Malfunctions on Quantitative Performance of the Diagnostic Technique
Highlights
In last few decades, thermoeconomic diagnosis has been shown to represent a promising instrument for the detection of malfunctions occurring in energy systems
In a recent paper [19] the classical thermoeconomic approaches have been tested with a set of multiple faults scenarios in air-cooled direct expansion air conditioning unit: the results indicated that conventional thermoeconomic diagnosis is not a reliable technique when applied to refrigeration systems because: it cannot efficiently deal with “system level” faults, i.e., with faults not associated with any specific component like refrigerant under- or over-charge, and the usually adopted “productive” model for the expansion valve erroneously leads to identify this component as “faulty” even when its operation has no anomalies
In the same paper the quantitative assessments of the additional exergy consumption provoked by evaporator fouling were not satisfactory, especially when low-depth coils or high values of absolute humidity of inlet air were concerned
Summary
Thermoeconomic diagnosis has been shown to represent a promising instrument for the detection of malfunctions occurring in energy systems. Exergy and cost represent the key concepts of thermoeconomic diagnosis; exergy, is a measure of thermodynamic “quality” of energy flows [7], and it allows to evaluate the rationale of energy conversion process by assessing the exergy destruction occurring at each stage [8]. As regards exergy application in built environment, useful methods were developed in [9] in order to estimate exergy/energy consumption; practical design-support instruments have been defined in COST Action C24 in order to facilitate the application of the exergy concept in this sector [10]
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