Thermodynamic analysis of air refrigerator on exergy graph

Nikulshin, Vladimir; Bailey, Margaret B.; Nikulshina, V.

doi:10.2298/tsci0601099n

Cited by 16 publications

(8 citation statements)

References 5 publications

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“…The exergy topological method developed by Nikulshin et al [43][44][45] was used to present a quantitative estimation of the exergy destroyed in an organic Rankine cycle (ORC) operating on R113. A detailed roadmap of exergy flow is presented using an exergy wheel diagram [1] and parameters such as degree of thermodynamic perfection, exergy efficiency, and influence coefficient were evaluated and compared for both ORC configurations.…”

Section: Discussionmentioning

confidence: 99%

“…7. Finally, it can be concluded that the methodology proposed by Nikulshin et al [43][44][45] was successfully adapted to analyze the performance of ORC and it could be adapted to evaluate even more complex, energyintensive system configurations.…”

Section: Discussionmentioning

confidence: 99%

“…Degree of thermodynamic perfection. The degree of thermodynamic perfection of element i is the ratio of the exergy leaving the element, E out i ; to the exergy flow into the element, E in i : It can be expressed as [44] …”

Section: Network Topological Methods (Or the Exergy Graph Method)mentioning

confidence: 99%

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An examination of exergy destruction in organic Rankine cycles

Mago

Srinivasan

Chamra

et al. 2008

Int. J. Energy Res.

102

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SUMMARYThe exergy topological method is used to present a quantitative estimation of the exergy destroyed in an organic Rankine cycle (ORC) operating on R113. A detailed roadmap of exergy flow is presented using an exergy wheel, and this visual representation clearly depicts the exergy accounting associated with each thermodynamic process. The analysis indicates that the evaporator accounts for maximum exergy destroyed in the ORC and the process responsible for this is the heat transfer across a finite temperature difference. In addition, the results confirm the thermodynamic superiority of the regenerative ORC over the basic ORC since regenerative heating helps offset a significant amount of exergy destroyed in the evaporator, thereby resulting in a thermodynamically more efficient process. Parameters such as thermodynamic influence coefficient and degree of thermodynamic perfection are identified as useful design metrics to assist exergy-based design of devices. This paper also examines the impact of operating parameters such as evaporator pressure and inlet temperature of the hot gases entering the evaporator on ORC performance. It is shown that exergy destruction decreases with increasing evaporator pressure and decreasing turbine inlet temperatures. Finally, the analysis reveals the potential of the exergy topological methodology as a robust technique to identify the magnitude of irreversibilities associated with real thermodynamic processes in practical thermal systems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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An examination of exergy destruction in organic Rankine cycles

Mago

Srinivasan

Chamra

et al. 2008

Int. J. Energy Res.

102

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“…The components are considered as nodes or elements of a network where they are linked by pipes and valves. More details on this approach can be found in [48][49][50][51]. For components and systems performance evaluation, energy efficiency model and other models developed by Nikulshin et al [51]: exergy loss model (EXL) and exergy efficiency model (EEF) will be used.…”

Section: Modelingmentioning

confidence: 99%

Exergy analysis of micro-organic Rankine power cycles for a small scale solar driven reverse osmosis desalination system

et al. 2010

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“…Var i ous meth od ol o gies have been sug gested in the lit er a ture as ways to pur sue this ob jec tive, based on dif fer ent ap proaches [6]. In the last de cades, the de vel op ment of exergoeconomics has been impres sive in more than one di rec tion and the use ful ness of this con cept was ac knowl edged by a large num ber of schol ars and the de vel op ment is still con tin u ing to day [19,20]. Exergoeconomic can play a vi tal role in the anal y sis, de sign, and op ti mi za tion of ther mal systems.…”

Section: Introductionsmentioning

confidence: 99%

Exergoeconomic optimization of gas turbine power plants operating parameters using genetic algorithms: A case study

Gorji-Bandpy¹,

Goodarzian

2011

Therm sci

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Exergoeconomic anal y sis helps de sign ers to find ways to im prove the per for mance of a sys tem in a cost ef fec tive way. This can play a vi tal role in the anal y sis, de sign, and op ti mi za tion of ther mal sys tems. Thermoeconomic op ti mi za tion is a pow er ful and ef fec tive tool in find ing the best so lu tions be tween the two com pet ing ob jectives, min i miz ing eco nomic costs and max i miz ing exergetic ef fi ciency. In this paper, op er at ing pa ram e ters of a gas tur bine power plant that pro duce 140 MW of elec tric ity were op ti mized us ing exergoeconomic prin ci ples and ge netic al gorithms. The anal y sis shows that the cost of fi nal prod uct is 9.78% lower with re spect to the base case. This is achieved with 8.77% in crease in to tal cap i tal in vest ment. Also thermoeconomic anal y sis and eval u a tion were per formed for the gas tur bine power plant. The re sults show the deep re la tion of the unit cost on the change of the op er at ing pa ram e ters. In tro duc tionsThe im por tance of de vel op ing ther mal sys tems that ef fec tively use en ergy re sources such as nat u ral gas is ap par ent. De sign ing ef fi cient and cost ef fec tive sys tems, which also meet en vi ron men tal con di tions, is one of the fore most chal lenges that en gi neers face [1]. In the world with fi nite nat u ral re sources and large en ergy de mands, it be comes in creas ingly im por tant to under stand the mech a nisms which de grade en ergy and re sources and to de velop sys tem atic approaches for im prov ing sys tems and thus also re duc ing the im pact on the en vi ron ment. Exergetics com bined with eco nom ics rep re sents pow er ful tools for the sys tem atic study and opti mi za tion of sys tems. Exergetics and microeconomics forms the ba sis of thermoeconomics, which is also named exergoeconomics [2]. Com bin ing the sec ond law of ther mo dy nam ics with eco nom ics (thermoeconomics) us ing avail abil ity of en ergy (exergy) for cost pur poses pro vides a pow er ful tool for sys tem atic study and op ti mi za tion of com plex en ergy sys tems. Its goal is to Gorji-Bandpy, M., et al.: Exergoeconomic Optimization of Gas Turbine Power .

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Thermodynamic analysis of air refrigerator on exergy graph

Cited by 16 publications

References 5 publications

An examination of exergy destruction in organic Rankine cycles

An examination of exergy destruction in organic Rankine cycles

Exergy analysis of micro-organic Rankine power cycles for a small scale solar driven reverse osmosis desalination system

Exergoeconomic optimization of gas turbine power plants operating parameters using genetic algorithms: A case study

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