Structural theory and thermoeconomic diagnosis

Torres, César I.; Valero, Antonio; Serra, Luis M.; Royo, Javier

doi:10.1016/s0196-8904(02)00032-8

Cited by 102 publications

(28 citation statements)

References 3 publications

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“…Thermal and mechanical exergies and negentropy, play very important roles as internal parameters to calculate the unit cost of various exergies. On the other hand, the MF and DYS method based on the conventional thermoeconomic theory [9] is an upstream analysis of the productive process, which needs difficult and elaborate calculations. Specifically, the total negentropy generated in all components appears as a principal product for the "system boundary", with a positive sign.…”

Section: E X Andmentioning

confidence: 99%

“…A feasibility of the diagnosis of a power plant based on thermoeconomic analysis was provided by Correas et al [6]. Further development of the thermoeconomic diagnosis which clarified the intrinsic and induced malfunction and determined the cost generated by the malfunction in degraded components was undertaken by Verda et al [7,8], Torres et al [9], and Valero et al [10]. A characteristic curve method to locate and categorize malfunctions was proposed by Lazzaretto and Toffolo [11] and Toffolo and Lazzaretto [12].…”

Section: Introductionmentioning

confidence: 99%

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Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study

Lee

Kwak

2017

Entropy

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Abstract:In this study, diagnosis of a 300-MW combined cycle power plant under faulty conditions was performed using a thermoeconomic method called modified productive structure analysis. The malfunction and dysfunction, unit cost of irreversibility and lost cost flow rate for each component were calculated for the cases of pre-fixed malfunction and the reference conditions. A commercial simulating software, GateCycle TM (version 6.1.2), was used to estimate the thermodynamic properties under faulty conditions. The relative malfunction (RMF) and the relative difference in the lost cost flow rate between real operation and reference conditions (RDLC) were found to be effective indicators for the identification of faulty components. Simulation results revealed that 0.5% degradation in the isentropic efficiency of air compressor, 2% in gas turbine, 2% in steam turbine and 2% degradation in energy loss in heat exchangers can be identified. Multi-fault scenarios that can be detected by the indicators were also considered. Additional lost exergy due to these types of faulty components, that can be detected by RMF or RDLC, is less than 5% of the exergy lost in the components in the normal condition.

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Section: E X Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study

Lee

Kwak

2017

Entropy

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“…Thus, the authors used the method of linear regression twice: first to derive dependence An alternative approach to determination of endogenous and exogenous destruction of exergy based on the Valero and Lozano theory of exergy cost was considered in [10]. The theory of exergy cost [11] was developed for thermo-economic diagnostics of the energy-transforming system and revealing causes of additional resource consumption by the system due to inefficiency of any of its elements.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…If flow ik E refers to the "product" of the i-th element, then according to the rule of exergy cost [10,11] …”

Section: Fig 2 a Generalized Diagram Of The Image Of The Target Exementioning

confidence: 99%

Thermodynamic analysis of air-compression refrigerating machine based on the exergy cost theory

Харлампиди

Tarasova

Kuznetsov

et al. 2017

EEJET

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“…Explaining in details the fundamentals of this methodology is out of the scope of this paper, as an abundant literature on this method is available [26].…”

Section: Generalitiesmentioning

confidence: 99%

Assessing the Robustness of Thermoeconomic Diagnosis of Fouled Evaporators: Sensitivity Analysis of the Exergetic Performance of Direct Expansion Coils

Piacentino

Catrini

2016

Entropy

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Thermoeconomic diagnosis of refrigeration systems is a pioneering approach to the diagnosis of malfunctions, which has been recently proven to achieve good performances for the detection of specific faults. Being an exergy-based diagnostic technique, its performance is influenced by the trends of exergy functions in the "design" and "abnormal" conditions. In this paper the sensitivity of performance of thermoeconomic diagnosis in detecting a fouled direct expansion coil and quantifying the additional consumption it induces is investigated; this fault is critical due to the simultaneous air cooling and dehumidification occurring in the coil, that induce variations in both the chemical and thermal fractions of air exergy. The examined parameters are the temperature and humidity of inlet air, the humidity of reference state and the sensible/latent heat ratio (varied by considering different coil depths). The exergy analysis reveals that due to the more intense dehumidification occurring in presence of fouling, the exergy efficiency of the evaporator coil eventually increases. Once the diagnostic technique is based only on the thermal fraction of air exergy, the results suggest that the performance of the technique increases when inlet air has a lower absolute humidity, as evident from the "optimal performance" regions identified on a psychrometric chart.

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Structural theory and thermoeconomic diagnosis

Cited by 102 publications

References 3 publications

Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study

Diagnosis of Combined Cycle Power Plant Based on Thermoeconomic Analysis: A Computer Simulation Study

Thermodynamic analysis of air-compression refrigerating machine based on the exergy cost theory

Assessing the Robustness of Thermoeconomic Diagnosis of Fouled Evaporators: Sensitivity Analysis of the Exergetic Performance of Direct Expansion Coils

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