Modeling and performance analysis of a microturbine as a distributed energy resource / Saha, A. K. in IEEE transactions on energy conversion, Vol. 24 N° 2 (Juin 2009)  

Public ISBD [article]  inIEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 529 - 538 Titre : Modeling and performance analysis of a microturbine as a distributed energy resource Type de document : texte imprimé Auteurs : Saha, A. K., Auteur ; Chowdhury, S., Auteur ; Chowdhury, S. P., Auteur Année de publication : 2009 Article en page(s) : pp. 529 - 538 Note générale : energy conversion Langues : Anglais (eng) Mots-clés : Distribution networks  power system simulation  synchronous generators  turbogenerators  velocity control Résumé : This paper presents modeling, simulation, and analysis of load following behavior of a microturbine (MT) as a distributed energy resource (DER). The MT-generator (MTG) system consists of the MT coupled to a synchronous generator. Simulation is done in MATLAB for different loading conditions under islanded and grid-connected modes. The MTG model also incorporates a speed controller for maintaining constant speed at variable loads. Performance is studied both with and without the speed controller. The paper also compares the simulation results with already reported results and with real life load following data for a typical islanded MT of similar rating. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957582&sortType%3Das [...] [article] Modeling and performance analysis of a microturbine as a distributed energy resource [texte imprimé] / Saha, A. K., Auteur ; Chowdhury, S., Auteur ; Chowdhury, S. P., Auteur . - 2009 . - pp. 529 - 538. energy conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 2 (Juin 2009) . - pp. 529 - 538 Mots-clés : Distribution networks  power system simulation  synchronous generators  turbogenerators  velocity control Résumé : This paper presents modeling, simulation, and analysis of load following behavior of a microturbine (MT) as a distributed energy resource (DER). The MT-generator (MTG) system consists of the MT coupled to a synchronous generator. Simulation is done in MATLAB for different loading conditions under islanded and grid-connected modes. The MTG model also incorporates a speed controller for maintaining constant speed at variable loads. Performance is studied both with and without the speed controller. The paper also compares the simulation results with already reported results and with real life load following data for a typical islanded MT of similar rating. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4957582&sortType%3Das [...]

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Validations of thermohydraulic models for geysering in a natural circulation loop using an impedance needle probe / S. Paruya in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2020–2033 Titre : Validations of thermohydraulic models for geysering in a natural circulation loop using an impedance needle probe Type de document : texte imprimé Auteurs : S. Paruya, Auteur ; Saha, A. K., Auteur ; P. Bhattacharya, Auteur Année de publication : 2009 Article en page(s) : p. 2020–2033 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Thermohydraulic models Geysering instability Short-tube natural circulation evaporator Impedance void-needle probe Résumé : This paper describes the validations of thermohydraulic models that predict the geysering instability observed at the riser section of a short-tube natural circulation evaporator (STNCE) at low heat flux and low pressure. The validations have been made by measuring the void fraction in the steam−water system at the riser section of a STNCE with the help of an impedance void-needle probe. The calibration of the probe shows that in the range of low void fractions the probe indicates lower values while in the range of high void fractions it indicates higher values compared to those measured by the manometer. Measured data of void fraction have been analyzed by thermohydraulic models. Both measured data and simulated data of temporal variation of void fractions during geysering have been observed to be periodic pulses of high amplitudes. Effects of riser height and loop resistance on the geysering frequency have been demonstrated in detail. The paper also discusses both the measurement uncertainties and the model uncertainties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005462 [article] Validations of thermohydraulic models for geysering in a natural circulation loop using an impedance needle probe [texte imprimé] / S. Paruya, Auteur ; Saha, A. K., Auteur ; P. Bhattacharya, Auteur . - 2009 . - p. 2020–2033. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - p. 2020–2033 Mots-clés : Thermohydraulic models Geysering instability Short-tube natural circulation evaporator Impedance void-needle probe Résumé : This paper describes the validations of thermohydraulic models that predict the geysering instability observed at the riser section of a short-tube natural circulation evaporator (STNCE) at low heat flux and low pressure. The validations have been made by measuring the void fraction in the steam−water system at the riser section of a STNCE with the help of an impedance void-needle probe. The calibration of the probe shows that in the range of low void fractions the probe indicates lower values while in the range of high void fractions it indicates higher values compared to those measured by the manometer. Measured data of void fraction have been analyzed by thermohydraulic models. Both measured data and simulated data of temporal variation of void fractions during geysering have been observed to be periodic pulses of high amplitudes. Effects of riser height and loop resistance on the geysering frequency have been demonstrated in detail. The paper also discusses both the measurement uncertainties and the model uncertainties. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8005462

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