Thermodynamic Analysis of the Irreversibilities in Solar Absorption Refrigerators

Berrich, Emna; Fellah, Ali; Brahim, Ammar Ben; Aloui, Fethi; Feidt, Michel

doi:10.3390/e18040107

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…. (27) One notes that g is a function of both θH and de θL according to the three variation laws adopted for the entropy production rate dependence on temperature, eq. (8)-(10).…”

Section: Optimization Methods and Studied Casesmentioning

confidence: 99%

“…while the second constraint equation (C2) remains the same as in the previous case of imposed COP, given by eq. (27). The objective function FO in eq.…”

Section: Imposed Refrigeration Loadmentioning

confidence: 99%

“…It provides a more general approach compared to the use of the irreversibility factor [16,[19][20]. Also, it aims the entropic analysis of machines and processes and is more and more important as an instrument getting modeling closer to real operation [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Stanciu

Feidt

Costea

et al. 2018

Preprint

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Several optimization models of irreversible reverse cycle machines have been developed based on different optimization criteria in the literature, most of them using linear heat transfer laws at the source and sink. This raises the issue how close to actual operation conditions they are, since the heat transfer law on the phase-change processes is dependent on ΔT3. This paper addresses this issue by proposing a general model for study and optimization of thermal machines with two heat reservoirs applied to a Carnot-like refrigerator, with non-linear heat transfer laws and internal and external irreversibility. The optimization was performed using First and Second Law of Thermodynamics and Lagrange multipliers method. Thus, several constraints were imposed to the system, also different objective functions were considered, allowing finding the optimum operating conditions, as well as the limited variation ranges of the system parameters. Results show that the nature of the heat transfer laws affects the optimum values of system parameters for obtaining maximum performances and also their magnitude. Sensitivity studies with respect to system several parameters are presented. The results contribute to the understanding of the system limits in operation under different constraints and allow choosing the most convenient variables in given circumstances.

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“…. (27) One notes that g is a function of both θH and de θL according to the three variation laws adopted for the entropy production rate dependence on temperature, eq. (8)-(10).…”

Section: Optimization Methods and Studied Casesmentioning

confidence: 99%

“…while the second constraint equation (C2) remains the same as in the previous case of imposed COP, given by eq. (27). The objective function FO in eq.…”

Section: Imposed Refrigeration Loadmentioning

confidence: 99%

See 1 more Smart Citation

Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Stanciu

Feidt

Costea

et al. 2018

Preprint

Self Cite

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show abstract

“…while the second constraint equation (C2) remains the same as in the previous case of imposed COP, given by Equation (27). The objective function FO in Equation 21is either the COP, or the non-dimensional entropy production s T .…”

Section: Imposed Refrigeration Loadmentioning

confidence: 99%

“…It provides a more general approach compared to the use of the irreversibility factor [16,19,20]. Also, it aims the entropic analysis of machines and processes and is more and more important as an instrument getting modeling closer to real operation [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Stanciu

Feidt

Costea

et al. 2018

Entropy

Self Cite

View full text Add to dashboard Cite

Several optimization models of irreversible reverse cycle machines have been developed based on different optimization criteria in the literature, most of them using linear heat transfer laws at the source and sink. This raises the issue how close to actual operation conditions they are, since the heat transfer law on the phase-change processes is dependent on ΔT3. This paper addresses this issue by proposing a general model for study and optimization of thermal machines with two heat reservoirs applied to a Carnot-like refrigerator, with non-linear heat transfer laws and internal and external irreversibility. The optimization was performed using First and Second Law of Thermodynamics and the Lagrange multipliers method. Thus, several constraints were imposed to the system, also different objective functions were considered, allowing finding the optimum operating conditions, as well as the limited variation ranges of the system parameters. Results show that the nature of the heat transfer laws affects the optimum values of system parameters for obtaining maximum performances and also their magnitude. Sensitivity studies with respect to system several parameters are presented. The results contribute to the understanding of the system limits in operation under different constraints and allow choosing the most convenient variables in given circumstances.

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Exergy Analysis in Modern Investigaions (Review)

et al. 2019

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Thermodynamic Analysis of the Irreversibilities in Solar Absorption Refrigerators

Cited by 4 publications

References 16 publications

Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Optimization and Entropy Production: Application to Carnot-Like Refrigeration Machines

Exergy Analysis in Modern Investigaions (Review)

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