Influence of two internal irreversibilities on the new thermo-ecological criterion for three-heat-source refrigerators

Nouadje, Brigitte Astrid Medjo; Wouagfack, Paiguy Armand Ngouateu; Tchinda, René

doi:10.1016/j.ijrefrig.2013.09.040

Cited by 22 publications

(6 citation statements)

References 34 publications

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“…With the help of it, the influences of irreversibilities associated to the heat-transfer processes between working substance and heat reservoirs, internal dissipations in the working substance, and external heat leakage losses have been discussed [21][22][23][24][25][26]. Besides, various figures of merit such as thermo-ecological, thermoeconomic, and ecological functions have been introduced to evaluate the performance of the system [16,[27][28][29]. In addition, many more realistic and meaningful results have been obtained with this model by adopting different heat-transfer laws and heat-transfer processes with finite heat capacity [30][31][32][33][34] and constructing different hybrid systems [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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In order to investigate the performance of a class of thermally driven refrigerators, usually driven by low-grade thermal energy, a generic thermodynamic model of three-heat-source refrigerator without involving any specific heat-transfer law is put forward by adopting low-dissipation assumptions. Based on the proposed model, the analytical expressions for the coefficient of performance (COP) and cooling power of the system are derived in terms of well-defined dissipation parameters and contact time durations between the system and heat reservoirs. One essential parameter accounting for the size ratio of the two coupled subsystems inside the overall system is introduced in light of the practical meaning of the reversible entropy change. With the help of the aforementioned parameter, the optimal relation between the COP and cooling power is obtained. The optimal operation region and optimal construction of the overall system are further determined for the first time. In addition, the influences of the dissipation and temporal symmetries are discussed in detail, according to which the upper and lower bounds of the COP at maximum cooling power are firstly obtained under two extreme situations. Experimental and simulated data from previous reported works are collected to illustrate the validity and practical significance of the proposed model and associated results. A limit case is presented to highlight the generality of the model.

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Section: Introductionmentioning

confidence: 99%

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Guo

Yang

Zhang

et al. 2019

Energy Conversion and Management

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show abstract

“…A step further [17] represents the internal irreversibility considered in the model as internal entropy production rate, i S  . This method is preferred to the one of ratios, as we still see in recent work [18].…”

Section: Introductionmentioning

confidence: 99%

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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“…S i . This method is preferred to the one of ratios, as we still see in recent work [18]. It provides a more general approach compared to the use of the irreversibility factor [16,19,20].…”

Section: Introductionmentioning

confidence: 99%

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

Stanciu

Feidt

Costea

et al. 2018

Entropy

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.

show abstract

Influence of two internal irreversibilities on the new thermo-ecological criterion for three-heat-source refrigerators

Cited by 22 publications

References 34 publications

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

Thermally driven refrigerators: Equivalent low-dissipation three-heat-source model and comparison with experimental and simulated results

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

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

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