New approach to thermal power plants operation regimes maximum power versus maximum efficiency

Radcenco, V.; Popescu, Gheorghe H.; Apostol, Valentin

doi:10.1016/j.ijthermalsci.2007.01.022

Cited by 13 publications

(10 citation statements)

References 6 publications

(4 reference statements)

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“…The two regimes of maximum power and maximum efficiency are significantly different. The obtained results confirm recent publication results [37,38]. Evolution of a) energy and exergy rates, and b) efficiencies in function of θ (heat transfer rate at the source imposed, parallel configuration).…”

Section: Efficiencies (Tab 5)supporting

confidence: 90%

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Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations

Costea

Feidt

Grigore

et al. 2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Optimisation des systèmes de turbine à combustion en cogénération pour différentes configurations des échangeurs de chaleur -Cet article explore et compare les performances des trois configurations de systèmes de turbine à combustion permettant la production combinée de chaleur et d'électricité, sur la base du cycle irréversible régénératif de Brayton-Joule. Le modèle proposé est développé pour deux contraintes différentes sur le cycle, notamment le flux de chaleur produit par combustion imposé ou la température maximale du cycle imposée. Le modèle considère également l'irréversibilité due au frottement dans le compresseur et la turbine et celle due aux pertes de chaleur dans la chambre de combustion et les échangeurs de chaleur. Le rendement au sens du premier principe du système sans et avec cogénération et le rendement exergétique rendent compte des avantages de la cogénération, et aident le concepteur à choisir la meilleure configuration de turbines à combustion en fonction de ses besoins. Des données expérimentales d'une microturbine opérationnelle ont été utilisées pour valider le modèle. La puissance fournie et les rendements au sens du premier principe et exergétique sont optimisés par rapport à un ensemble de paramètres de fonctionnement. Les valeurs optimales des paramètres du moteur à turbine à combustion qui correspondent au maximum de puissance fournie, respectivement au maximum de rendement thermodynamique sont discutées. Les résultats montrent que la plupart des performances maximales correspondent aux mêmes valeurs optimales du taux de compression pour le flux imposé, sauf le rendement exergétique maximum qui demande des valeurs plus élevées du taux de compression que celles pour le maximum du flux d'exergie. Une comparaison des performances de ces trois configurations et les perspectives sont proposées. Abstract -Optimization of Gas Turbine Cogeneration System for Various Heat Exchanger

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Section: Efficiencies (Tab 5)supporting

confidence: 90%

“…of the recuperator as: (38) Other temperatures are determined as follows: -the temperature of the flue gas at the heat recuperator exit: (39) -the temperature at the useful heat exchanger exit:…”

Section: Case With the Recuperator Connected In Parallel With The Usementioning

confidence: 99%

Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations

Costea

Feidt

Grigore

et al. 2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…5-7, as is also shown by paper [49], one can see that optimization results are essentially different for two optimization objectives. 5-7, as is also shown by paper [49], one can see that optimization results are essentially different for two optimization objectives.…”

Section: Comparison Between the Optimal And Conventional Piston Motionssupporting

confidence: 69%

Optimal paths of piston motion of irreversible diesel cycle for minimum entropy generation

Ge¹,

Chen²,

Sun³

2011

THERM SCI

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A Diesel cycle heat engine with internal and external irreversibility’s of heat transfer and friction, in which the finite rate of combustion is considered and the heat transfer between the working fluid and the environment obeys Newton’s heat transfer law [q≈ Δ(T)], is studied in this paper. Optimal piston motion trajectories for minimizing entropy generation per cycle are derived for the fixed total cycle time and fuel consumed per cycle. Optimal control theory is applied to determine the optimal piston motion trajectories for the cases of with piston acceleration constraint on each stroke and the optimal distribution of the total cycle time among the strokes. The optimal piston motion with acceleration constraint for each stroke consists of three segments, including initial maximum acceleration and final maximum deceleration boundary segments, respectively. Numerical examples for optimal configurations are provided, and the results obtained are compared with those obtained when maximizing the work output with Newton’s heat transfer law. The results also show that optimizing the piston motion trajectories could reduce engine entropy generation by more than 20%. This is primarily due to the decrease in entropy generation caused by heat transfer loss on the initial portion of the power stroke

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“…It is expected that further development of the technology would be focused on the mastering of ultrasupercritical parameters as well as the increasing of efficiency of power units. This mainly depends on progress to be done in the area of material engineering [1], [2], [3], [5], [7], [9], [13], [15], [16], [17], [22], [28], [29], [30], [31], [32], [34], [39], [40], [48], [49], [50]. Investigations are also carried out in the frame of large international projects such as e.g.…”

Section: Description Of Supercritical Power Stationsmentioning

confidence: 99%

Optimization of steam cycles with respect to supercritical parameters

Piwowarski¹

2009

Polish Maritime Research

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New approach to thermal power plants operation regimes maximum power versus maximum efficiency

Cited by 13 publications

References 6 publications

Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations

Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations

Optimal paths of piston motion of irreversible diesel cycle for minimum entropy generation

Optimization of steam cycles with respect to supercritical parameters

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