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M. Feidt
LEMTA UMR 7563, CNRS-INPL-UHP, Laboratoire d’Energétique et de Mécanique Théorique et Appliquée, 2 avenue de la Forêt de Haye, BP 160, 54516 Vandoeuvre-lès-Nancy - France

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Review article
Published: 31 January 2013 in International Journal of Refrigeration
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Thermodynamics is an important tool for modelling a reverse cycle machine. To the classical approach to equilibrium Thermodynamics, must be added a more recent one referring to new tendencies in thermodynamics; this new appraisal starts in the eighties with the work of C.H. Blanchard and the author. Here, a review of these new tendencies and the consequences for the corresponding reverse machines (refrigerating machine; heat pump; air conditioning; heat transformer) is proposed.

ACS Style

M. Feidt. Evolution of thermodynamic modelling for three and four heat reservoirs reverse cycle machines: A review and new trends. International Journal of Refrigeration 2013, 36, 8 -23.

AMA Style

M. Feidt. Evolution of thermodynamic modelling for three and four heat reservoirs reverse cycle machines: A review and new trends. International Journal of Refrigeration. 2013; 36 (1):8-23.

Chicago/Turabian Style

M. Feidt. 2013. "Evolution of thermodynamic modelling for three and four heat reservoirs reverse cycle machines: A review and new trends." International Journal of Refrigeration 36, no. 1: 8-23.

Journal article
Published: 24 September 2012 in Energies
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The paper presents a comparison of various CHP system configurations, such as Vapour Turbine, Gas Turbine, Internal Combustion Engine, External Combustion Engine (Stirling, Ericsson), when different thermodynamic criteria are considered, namely the first law efficiency and exergy efficiency. Thermodynamic optimization of these systems is performed intending to maximize the exergy, when various practical related constraints (imposed mechanical useful energy, imposed heat demand, imposed heat to power ratio) or main physical limitations (limited heat availability, maximum system temperature allowed, thermo-mechanical constraints) are taken into account. A sensitivity analysis to model parameters is given. The results have shown that the various added constraints were useful for the design allowing to precise the influence of the model main parameters on the system design. Future perspective of the work and recommendations are stated.

ACS Style

Michel Feidt; Monica Costea. Energy and Exergy Analysis and Optimization of Combined Heat and Power Systems. Comparison of Various Systems. Energies 2012, 5, 3701 -3722.

AMA Style

Michel Feidt, Monica Costea. Energy and Exergy Analysis and Optimization of Combined Heat and Power Systems. Comparison of Various Systems. Energies. 2012; 5 (9):3701-3722.

Chicago/Turabian Style

Michel Feidt; Monica Costea. 2012. "Energy and Exergy Analysis and Optimization of Combined Heat and Power Systems. Comparison of Various Systems." Energies 5, no. 9: 3701-3722.

Journal article
Published: 12 July 2012 in Entropy
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In recent decades, the approach known as Finite-Dimension Thermodynamics has provided a fruitful theoretical framework for the optimization of heat engines operating between a heat source (at temperature Ths) and a heat sink (at temperature Tcs). We will show in this paper that the approach detailed in a previous paper [1] can be used to analytically model irreversible heat engines (with an additional assumption on the linearity of the heat transfer laws). By defining two dimensionless parameters, the intensity of internal dissipation and heat leakage within a heat engine were quantified. We then established the analogy between an endoreversible heat engine and an irreversible heat engine by using the apparent temperatures (Tcs → Tλ,φ cs, Ths → Tλ,φ hs) and apparent conductances (Kh → Kλ h, Kc → Kλ c). We thus found the analytical expression of the maximum power of an irreversible heat engine. However, these apparent temperatures should not be used to calculate the conversion efficiency at the optimal operating point by analogy with the case of an endoreversible heat engine.

ACS Style

Yuxiang Dong; Amin El-Bakkali; Michel Feidt; Georges Descombes; Christelle Perilhon. Association of Finite-Dimension Thermodynamics and a Bond-Graph Approach for Modeling an Irreversible Heat Engine. Entropy 2012, 14, 1234 -1258.

AMA Style

Yuxiang Dong, Amin El-Bakkali, Michel Feidt, Georges Descombes, Christelle Perilhon. Association of Finite-Dimension Thermodynamics and a Bond-Graph Approach for Modeling an Irreversible Heat Engine. Entropy. 2012; 14 (7):1234-1258.

Chicago/Turabian Style

Yuxiang Dong; Amin El-Bakkali; Michel Feidt; Georges Descombes; Christelle Perilhon. 2012. "Association of Finite-Dimension Thermodynamics and a Bond-Graph Approach for Modeling an Irreversible Heat Engine." Entropy 14, no. 7: 1234-1258.

Journal article
Published: 28 March 2012 in Entropy
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In recent decades, the approach known as Finite-Time Thermodynamics has provided a fruitful theoretical framework for the optimization of heat engines operating between a heat source (at temperature ) and a heat sink (at temperature ). The aim of this paper is to propose a more complete approach based on the association of Finite-Time Thermodynamics and the Bond-Graph approach for modeling endoreversible heat engines. This approach makes it possible for example to find in a simple way the characteristics of the optimal operating point at which the maximum mechanical power of the endoreversible heat engine is obtained with entropy flow rate as control variable. Furthermore it provides the analytical expressions of the optimal operating point of an irreversible heat engine where the energy conversion is accompanied by irreversibilities related to internal heat transfer and heat dissipation phenomena. This original approach, applied to an analysis of the performance of a thermoelectric generator, will be the object of a future publication.

ACS Style

Yuxiang Dong; Amin El-Bakkali; Georges Descombes; Michel Feidt; Christelle Périlhon. Association of Finite-Time Thermodynamics and a Bond-Graph Approach for Modeling an Endoreversible Heat Engine. Entropy 2012, 14, 642 -653.

AMA Style

Yuxiang Dong, Amin El-Bakkali, Georges Descombes, Michel Feidt, Christelle Périlhon. Association of Finite-Time Thermodynamics and a Bond-Graph Approach for Modeling an Endoreversible Heat Engine. Entropy. 2012; 14 (4):642-653.

Chicago/Turabian Style

Yuxiang Dong; Amin El-Bakkali; Georges Descombes; Michel Feidt; Christelle Périlhon. 2012. "Association of Finite-Time Thermodynamics and a Bond-Graph Approach for Modeling an Endoreversible Heat Engine." Entropy 14, no. 4: 642-653.

Journal article
Published: 11 November 2011 in Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
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The present paper investigates and compares the performance of three configurations of Gas Turbine systems allowing cogeneration of heat and electricity, on the basis of an irreversible regenerative Brayton-Joule cycle. The proposed model is developed for two different cycle constraints, namely, an imposed heat transfer rate released by the fuel combustion, or an imposed maximum cycle temperature. The model also includes the irreversibility due to the friction in the compressor and turbine, and due to the heat losses in the combustion chamber and heat exchangers. Energy efficiency for the system without and with cogeneration, and the exergetic efficiency are used in order to emphasize the cogeneration advantages, but also to help the designer to choose the best configuration of the Gas Turbine system that suits to his needs. Experimental data from a real operating microturbine were used to validate the model. The power output and the energy and exergetic efficiencies are optimized with respect to a set of operating parameters. The optimum values of the Gas Turbine engine parameters corresponding to maximum power output and respectively to maximum thermodynamic efficiency are discussed. The results show same optimal values of the compression ratio corresponding to almost all maximum performances for an imposed heat transfer rate released by the fuel combustion, excepting the maximum exergetic efficiency that requires higher optimal values of the compression ratio than the maximum exergy rate one. A performance comparison of the three configurations is done and future perspectives of the work are proposed. Résumé 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.

ACS Style

M. Costea; M. Feidt; G. Alexandru; D. Descieux. Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 2011, 67, 517 -535.

AMA Style

M. Costea, M. Feidt, G. Alexandru, D. Descieux. Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles. 2011; 67 (3):517-535.

Chicago/Turabian Style

M. Costea; M. Feidt; G. Alexandru; D. Descieux. 2011. "Optimization of Gas Turbine Cogeneration Systemfor Various Heat Exchanger Configurations." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 67, no. 3: 517-535.

Journal article
Published: 22 September 2011 in Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
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Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles

ACS Style

D. Descieux; Michel Feidt. Modelling of a Spark Ignition Engine for Power-Heat Production Optimization. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 2011, 66, 737 -745.

AMA Style

D. Descieux, Michel Feidt. Modelling of a Spark Ignition Engine for Power-Heat Production Optimization. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles. 2011; 66 (5):737-745.

Chicago/Turabian Style

D. Descieux; Michel Feidt. 2011. "Modelling of a Spark Ignition Engine for Power-Heat Production Optimization." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 66, no. 5: 737-745.

Journal article
Published: 21 December 2010 in Entropy
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The purpose of this work is to precise and complete one recently proposed in the literature and relative to a general criterion to maximize the first law efficiency of irreversible heat engines. It is shown that the previous proposal seems to be a particular case. A new proposal has been developed for a Carnot irreversible thermomechanical heat engine at steady state associated to two infinite heat reservoirs (hot source, and cold sink): this constitutes the studied system. The presence of heat leak is accounted for, with the most simple form, as is done generally in the literature. Irreversibility is modeled through , created internal entropy rate in the converter (engine), and , total created entropy rate in the system. Heat transfer laws are represented as general functions of temperatures. These concepts are particularized to the most common heat transfer law (linear one). Consequences of the proposal are examined; some new analytical results are proposed for efficiencies.

ACS Style

Michel Feidt. Reconsideration of Criteria and Modeling in Order to Optimize the Efficiency of Irreversible Thermomechanical Heat Engines. Entropy 2010, 12, 2470 -2484.

AMA Style

Michel Feidt. Reconsideration of Criteria and Modeling in Order to Optimize the Efficiency of Irreversible Thermomechanical Heat Engines. Entropy. 2010; 12 (12):2470-2484.

Chicago/Turabian Style

Michel Feidt. 2010. "Reconsideration of Criteria and Modeling in Order to Optimize the Efficiency of Irreversible Thermomechanical Heat Engines." Entropy 12, no. 12: 2470-2484.

Journal article
Published: 28 February 2010 in Energy
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The objective of this paper is to develop a methodology to determine how many houses could be fueled from the solar energy captured by a number of solar Stirling modules (with a fixed dish area per module) and also to determine the minimum necessary area of the fuel cell to ensure the amount of power needed to meet daily energy use requirements. The detailed method includes the effect of the fuel cell efficiency function on the power consumption of the user. Experimental data from our laboratory are used to determine the fuel cell efficiency as a function of the electric current density for a specific power demand. As an illustrative example, the analysis is applied to a residential area having a specific electrical demand. Using the developed method, the number of houses that could be fueled directly by the stored hydrogen is determined, and also the minim fuel cell area required.

ACS Style

Stoian Petrescu; Camelia Petre; Monica Costea; Octavian Malancioiu; Nicolae Boriaru; Alexandru Dobrovicescu; Michel Feidt; Charles Harman; Camelia Stanciu. A methodology of computation, design and optimization of solar Stirling power plant using hydrogen/oxygen fuel cells. Energy 2010, 35, 729 -739.

AMA Style

Stoian Petrescu, Camelia Petre, Monica Costea, Octavian Malancioiu, Nicolae Boriaru, Alexandru Dobrovicescu, Michel Feidt, Charles Harman, Camelia Stanciu. A methodology of computation, design and optimization of solar Stirling power plant using hydrogen/oxygen fuel cells. Energy. 2010; 35 (2):729-739.

Chicago/Turabian Style

Stoian Petrescu; Camelia Petre; Monica Costea; Octavian Malancioiu; Nicolae Boriaru; Alexandru Dobrovicescu; Michel Feidt; Charles Harman; Camelia Stanciu. 2010. "A methodology of computation, design and optimization of solar Stirling power plant using hydrogen/oxygen fuel cells." Energy 35, no. 2: 729-739.

Review
Published: 28 September 2009 in Entropy
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This paper reviews how ideas have evolved in this field from the pioneering work of CARNOT right up to the present. The coupling of thermostatics with thermokinetics (heat and mass transfers) and entropy or exergy analysis is illustrated through study of thermomechanical engines such as the Carnot heat engine, and internal combustion engines. The benefits and importance of stagnation temperature and irreversibility parameters are underlined. The main situations of constrained (or unconstrained) optimization are defined, discussed and illustrated. The result of this study is a new branch of thermodynamics: Finite Dimensions Optimal Thermodynamics (FDOT).

ACS Style

Michel Feidt. Optimal Thermodynamics—New Upperbounds. Entropy 2009, 11, 529 -547.

AMA Style

Michel Feidt. Optimal Thermodynamics—New Upperbounds. Entropy. 2009; 11 (4):529-547.

Chicago/Turabian Style

Michel Feidt. 2009. "Optimal Thermodynamics—New Upperbounds." Entropy 11, no. 4: 529-547.

Journal article
Published: 01 March 2006 in Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
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ACS Style

V. E. Cenusa; M. Feidt; R. Benelmir; Adrian Badea. Optimisation des cycles combinés gaz/vapeur avec un ou deux niveaux de pression et chaudière à surface d'échange imposée. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 2006, 61, 225 -235.

AMA Style

V. E. Cenusa, M. Feidt, R. Benelmir, Adrian Badea. Optimisation des cycles combinés gaz/vapeur avec un ou deux niveaux de pression et chaudière à surface d'échange imposée. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles. 2006; 61 (2):225-235.

Chicago/Turabian Style

V. E. Cenusa; M. Feidt; R. Benelmir; Adrian Badea. 2006. "Optimisation des cycles combinés gaz/vapeur avec un ou deux niveaux de pression et chaudière à surface d'échange imposée." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 61, no. 2: 225-235.

Journal article
Published: 01 March 2006 in Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
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ACS Style

M. Feidt. Editorial. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 2006, 61, 187 -190.

AMA Style

M. Feidt. Editorial. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles. 2006; 61 (2):187-190.

Chicago/Turabian Style

M. Feidt. 2006. "Editorial." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 61, no. 2: 187-190.

Journal article
Published: 01 March 2006 in Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles
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ACS Style

M. Feidt; M. Costea; V. Postelnicu. Comparaison entre le cycle simple de Brayton avec apport thermique imposé et avec contrainte de température maximale. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 2006, 61, 237 -245.

AMA Style

M. Feidt, M. Costea, V. Postelnicu. Comparaison entre le cycle simple de Brayton avec apport thermique imposé et avec contrainte de température maximale. Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles. 2006; 61 (2):237-245.

Chicago/Turabian Style

M. Feidt; M. Costea; V. Postelnicu. 2006. "Comparaison entre le cycle simple de Brayton avec apport thermique imposé et avec contrainte de température maximale." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 61, no. 2: 237-245.

Journal article
Published: 28 February 2005 in Applied Thermal Engineering
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The concentration with mechanical vapour compression (MVC) is one of the techniques recommended commonly in the industry for advantages that consist mainly in low consumption of electricity. Several books are talking about the comparative study of energy and economic costs of the equipped installations, and general comparison with other technical processes of concentration such as thermocompression or concentration with multiple effects. We present in this paper a thermoeconomic modelling based on the energy balances for an installation of concentration with MVC located on the site of EDF (Les Renardières, France) according to two kinds of model (linear models and power models) and optimizing the costs as a function of the temperature difference in evapo-condenser (main component of the concentration by evaporation system). Validation of the proposed model is favourable on the existing installation studied, the proposed model for costs could be useful to design new ones. Sensitivity study to the main design parameters has been performed.

ACS Style

S. Hayani Mounir; M. Feidt; C. Vasse. Thermoeconomic study of a system for pollutant concentration with mechanical vapour compression. Applied Thermal Engineering 2005, 25, 473 -484.

AMA Style

S. Hayani Mounir, M. Feidt, C. Vasse. Thermoeconomic study of a system for pollutant concentration with mechanical vapour compression. Applied Thermal Engineering. 2005; 25 (2-3):473-484.

Chicago/Turabian Style

S. Hayani Mounir; M. Feidt; C. Vasse. 2005. "Thermoeconomic study of a system for pollutant concentration with mechanical vapour compression." Applied Thermal Engineering 25, no. 2-3: 473-484.

Book chapter
Published: 01 January 2003 in Low Temperature and Cryogenic Refrigeration
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An inverse cycle machine is a system that needs a given form of energy, to transfer thermal energy from a source at low temperature side, to a sink at high temperature side.

ACS Style

M. Feidt. Advanced Thermodynamics of Reverse Cycle Machine. Low Temperature and Cryogenic Refrigeration 2003, 39 -82.

AMA Style

M. Feidt. Advanced Thermodynamics of Reverse Cycle Machine. Low Temperature and Cryogenic Refrigeration. 2003; ():39-82.

Chicago/Turabian Style

M. Feidt. 2003. "Advanced Thermodynamics of Reverse Cycle Machine." Low Temperature and Cryogenic Refrigeration , no. : 39-82.