Study of the improvement in the performance coefficient of machines operating with three reservoirs

Grosu, Lavinia; Feidt, Michel; Benelmir, Riad

doi:10.1504/ijex.2004.004729

Cited by 16 publications

(11 citation statements)

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“…Finite-time thermodynamics optimization [1][2][3][4][5][6] have been developed to evaluate and enhance the efficiency of this absorption system for cooling application operating between three temperature levels, and a lot of results, which are different from those obtained by using the classical thermodynamics, have been derived. Yan et al [7][8][9], Goktun [10], Bejan et al [11,12], Chen et al [13], Baustita et al [14,15], Grosu et al [16], Wei Han et al [17], Kodal et al [18] and Wu et al [19] analyzed the performance of the three-heat-reservoir endoreversible [7-9, 11, 12, 14] and irreversible [10,13,[15][16][17][18][19] absorption refrigeration cycles with linear heat transfer lawQα (T ). Real heat transfers between heat reservoirs and working substance do not always obey linear (Newtonian) heat transfer lawQα (T ).…”

Section: A Cmentioning

confidence: 99%

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Irreversible three-heat-source refrigerator with heat transfer law of QαΔ(T −1) and its performance optimization based on ECOP criterion

Wouagfack

Tchinda

2011

Energy Syst

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The new thermo-ecological optimization of an absorption system for cooling applications operating between three temperature levels with the linear phenomenological heat transfer law ofQα (T −1 ) has been performed by taking account the losses of heat resistance, internal irreversibility and leakage. The considered objective function is the ecological coefficient of performance (ECOP) and is defined as the cooling load per unit loss rate of availability. The comparative analysis with the ecological optimization criterion (E) defined in the literature and also with the cooling load optimization criterion (R) has been carried out to prove the utility of the new thermo-ecological optimization criterion (ECOP) for three-heat-source refrigerators with linear phenomenological heat transfer law. The results show that the three-heatsource refrigeration cycle working at maximum ECOP conditions has a significant advantage in terms of entropy production rate and coefficient of performance over the maximum E and maximum R conditions. The obtained results may provide a general theoretical tool for the thermo-ecological design of absorption refrigerator. Abbreviations Nomenclature ATotal heat-transfer area (m 2 ) A A Heat-transfer area of absorber (m 2 ) P.A. Ngouateu Wouagfack ( ) L2MSP,

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Section: A Cmentioning

confidence: 99%

“…Substituting (16) and (13) into (8)-(12) yields maximum ecological criterion function E max and the corresponding cooling load R me , coefficient of performance COP me , entropygeneration rate σ me and ecological coefficient of performance ECOP me .…”

Section: The Maximum E (E Max )mentioning

confidence: 99%

Irreversible three-heat-source refrigerator with heat transfer law of QαΔ(T −1) and its performance optimization based on ECOP criterion

Wouagfack

Tchinda

2011

Energy Syst

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“…The importance of irreversibility in the characterization of reverse cycle machines was also highlighted. The studies carried out in [7] on the heat transfer effect relative to the irreversibility on the specific cooling load (SCL) of refrigerators permit the distinction between four types of thermodynamic models relative to four forms of irreversibility (reversible, endoreversible, exoreversible, and irreversible). Bejan [8] studied the internal heat transfer irreversibility for refrigeration plants.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis of the Irreversibilities in Solar Absorption Refrigerators

Berrich

Fellah

Brahim

et al. 2016

Entropy

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A thermodynamic analysis of the irreversibility on solar absorption refrigerators is presented. Under the hierarchical decomposition and the hypothesis of an endoreversible model, many functional and practical domains are defined. The effect of external heat source temperature on the entropy rate and on the inverse specific cooling load (ISCL) multiplied by the total area of the refrigerator A/Q e are studied. This may help a constructor to well dimension the solar machine under an optimal technico-economical criterion A/Q e and with reasonable irreversibility on the refrigerator. The solar concentrator temperature effect on the total exchanged area, on the technico-economical ratio A/Q e , and on the internal entropy rate are illustrated and discussed. The originality of these results is that they allow a conceptual study of a solar absorption refrigeration cycle.

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“…The refrigerating power of the ACS is estimated about 45.6 kW, determined by the dynamic analysis of the thermal behavior of the building. Solar energy could be the fuel for different cooling technologies: Stirling machine [1], ejection and absorption machines [2][3][4][5][6]. Using thermal energy to power the absorption system offers the possibility to consider the sun as fuel for this system and ensure cooling in summer when this source is abundantly available [7].…”

Section: Introductionmentioning

confidence: 99%

Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

Grosu

Marin

Dobrovicescu

et al. 2015

Int J Energy Environ Eng

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In this paper, exergy analysis is used to evaluate the performance of a combined cycle: organic Rankine cycle (ORC) and absorption cooling system (ACS) using LiBr-H 2 O, powered by a solar field with linear concentrators. The goal of this work is to design the cogeneration system able to supply electricity and ambient cooling of an academic building and to find solutions to improve the performance of the global system. Solar ACS is combined with the ORC system-its coefficient of performance depends on the inlet temperature of the generator which is imposed by the outlet of the ORC. Exergetic efficiency and exergy destruction ratio are calculated for the whole system according to the second law of thermodynamics. Exergy analysis of each sub-system leads to the choice of the optimum physical parameters for minimum local exergy destruction ratios. In this way, a different connection of the heat exchangers is proposed in order to assure a maximum heat recovery.

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Study of the improvement in the performance coefficient of machines operating with three reservoirs

Cited by 16 publications

References 0 publications

Irreversible three-heat-source refrigerator with heat transfer law of QαΔ(T −1) and its performance optimization based on ECOP criterion

Irreversible three-heat-source refrigerator with heat transfer law of QαΔ(T −1) and its performance optimization based on ECOP criterion

Thermodynamic Analysis of the Irreversibilities in Solar Absorption Refrigerators

Exergy analysis of a solar combined cycle: organic Rankine cycle and absorption cooling system

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