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Partager le résultat de cette recherche Interroger des sources externesPerformances des systèmes frigorifiques trans-critiques utilisant le CO2 comme fluide frigorigène / Nabil Khellaf
Titre : Performances des systèmes frigorifiques trans-critiques utilisant le CO2 comme fluide frigorigène Type de document : texte imprimé Auteurs : Nabil Khellaf, Auteur ; Rabah Gomri, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 161 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Réfrigération Cycles Trans-critiques Dioxyde de Carbone Transfert de Chaleur Évaporation Simulation Optimisation Performance Refrigeration transcritical cycles Carbon Dioxide Heat Transfer Evaporation Optimization ??????? ????? ??? ???? ???? ????? ??????? ?????? ??????? ?????? Index. décimale : 626 Génie Climatique Résumé : The negative impact of synthetic fluids on the environment has led researchers to
natural refrigerants, although these fluids are not harmful on the environment, some of them are dangerous because of their flammability and toxicity. Therefore, carbon dioxide goes into very good position among the other natural fluids. The thermodynamic properties of CO2 require a trans-critical cycle. Unfortunately, this cycle has low performance compared to conventional cycles. The main objective of this work is to improve the performance of the refrigeration systems using CO2 as refrigerant and study the heat transfer of carbon dioxide in evaporation.
Based on the first law of thermodynamics and the optimization analysis several trans-critical cycles were studied, in addition, new proposed cycles have been proposed and studied.
As regards the study of heat transfer during evaporation of CO2, literature review has shown that there are several correlations used to predict the coefficient of heat transfer. In order to evaluate these correlations and select the best correlation allowing the optimal design of evaporator, which ensures the required cooling capacity, an experimental database was extracted from different papers available in the literature and compared with these correlations.
Diplôme : Doctorat En ligne : ../theses/gclim/KHE6996.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10398 Performances des systèmes frigorifiques trans-critiques utilisant le CO2 comme fluide frigorigène [texte imprimé] / Nabil Khellaf, Auteur ; Rabah Gomri, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 161 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Réfrigération Cycles Trans-critiques Dioxyde de Carbone Transfert de Chaleur Évaporation Simulation Optimisation Performance Refrigeration transcritical cycles Carbon Dioxide Heat Transfer Evaporation Optimization ??????? ????? ??? ???? ???? ????? ??????? ?????? ??????? ?????? Index. décimale : 626 Génie Climatique Résumé : The negative impact of synthetic fluids on the environment has led researchers to
natural refrigerants, although these fluids are not harmful on the environment, some of them are dangerous because of their flammability and toxicity. Therefore, carbon dioxide goes into very good position among the other natural fluids. The thermodynamic properties of CO2 require a trans-critical cycle. Unfortunately, this cycle has low performance compared to conventional cycles. The main objective of this work is to improve the performance of the refrigeration systems using CO2 as refrigerant and study the heat transfer of carbon dioxide in evaporation.
Based on the first law of thermodynamics and the optimization analysis several trans-critical cycles were studied, in addition, new proposed cycles have been proposed and studied.
As regards the study of heat transfer during evaporation of CO2, literature review has shown that there are several correlations used to predict the coefficient of heat transfer. In order to evaluate these correlations and select the best correlation allowing the optimal design of evaporator, which ensures the required cooling capacity, an experimental database was extracted from different papers available in the literature and compared with these correlations.
Diplôme : Doctorat En ligne : ../theses/gclim/KHE6996.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10398 Exemplaires
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Titre : Contribution à l'amélioration des performances d'un séparateur statique tourbillonnaire Type de document : texte imprimé Auteurs : Michel Pellerej ; M. Alquier, Directeur de thèse ; Institut national polyyechnique, Editeur scientifique Année de publication : 1981 Importance : 281 p. Note générale : Disponible au magasin de la bibliothèque centrale Langues : Français (fre) Tags : pérformance Séparateur Index. décimale : 620 Génie Mécanique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=909 Contribution à l'amélioration des performances d'un séparateur statique tourbillonnaire [texte imprimé] / Michel Pellerej ; M. Alquier, Directeur de thèse ; Institut national polyyechnique, Editeur scientifique . - 1981 . - 281 p.
Disponible au magasin de la bibliothèque centrale
Langues : Français (fre)
Tags : pérformance Séparateur Index. décimale : 620 Génie Mécanique Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=909 Exemplaires
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Titre : American cultural imperialism and Chinese resistance through performance : from a postcolonial perspective. Type de document : texte imprimé Auteurs : Allal Belaid, Auteur ; Brahim Harouni, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 226 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Anglais (eng) Tags : The United States China Imperialism Hegemony Americanization CultureIdeology Resistance Performance Etats-Unis Chine Impérialisme Hégémonie Américanisation Culture Idéologie Résistance ???????? ??????? ????? ??????????? ??????? ???????? ?????? Index. décimale : 420 Anglais et vieil anglais (anglo-saxon) : indice de base 42 Résumé : The wide spread of American culture has recently triggered a controversial debate among scholars in the field of Humanities. The hegemonic phenomenon has affected societies from different corners of the globe, and it appears that even most conservative societies are not safe from such global homogenization. Accordingly, this thesis attempts to describe and analyze American cultural imperialism in light of the twenty-first century global changes and cultural configurations. From a postcolonial view, it examines the complex relationship within the American-Chinese couple. The theoretical part is devoted to study and define the key concepts and their relation with Uncle Sam's expansionist culture. It provides an overall picture of the classic history of the United States to underline the fact that culture has always been the basis of American hegemonic practices around the world. From its creation to the globalization era, passing through continental Americanization, the US has chiefly relied on culture to build up its modern empire. On the way, the thesis examines Chinese society to give evidences about cultural expansion and its impacts on both social structure and consumption. It synthesizes that culture has a great role in controlling societies and more importantly in gaining the US ideological and consuming markets. At last, the thesis investigates the reaction of the Chinese administration, with at its head the Communist Party, against American cultural incursion that plainly impacted Chinese identity and sovereignty. It goes through three important performances which show how China converted a cultural struggle against American imperialism into a prosperous cultural move.
Diplôme : Doctorat En ligne : ../theses/anglais/BEL1521.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10965 American cultural imperialism and Chinese resistance through performance : from a postcolonial perspective. [texte imprimé] / Allal Belaid, Auteur ; Brahim Harouni, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 226 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Anglais (eng)
Tags : The United States China Imperialism Hegemony Americanization CultureIdeology Resistance Performance Etats-Unis Chine Impérialisme Hégémonie Américanisation Culture Idéologie Résistance ???????? ??????? ????? ??????????? ??????? ???????? ?????? Index. décimale : 420 Anglais et vieil anglais (anglo-saxon) : indice de base 42 Résumé : The wide spread of American culture has recently triggered a controversial debate among scholars in the field of Humanities. The hegemonic phenomenon has affected societies from different corners of the globe, and it appears that even most conservative societies are not safe from such global homogenization. Accordingly, this thesis attempts to describe and analyze American cultural imperialism in light of the twenty-first century global changes and cultural configurations. From a postcolonial view, it examines the complex relationship within the American-Chinese couple. The theoretical part is devoted to study and define the key concepts and their relation with Uncle Sam's expansionist culture. It provides an overall picture of the classic history of the United States to underline the fact that culture has always been the basis of American hegemonic practices around the world. From its creation to the globalization era, passing through continental Americanization, the US has chiefly relied on culture to build up its modern empire. On the way, the thesis examines Chinese society to give evidences about cultural expansion and its impacts on both social structure and consumption. It synthesizes that culture has a great role in controlling societies and more importantly in gaining the US ideological and consuming markets. At last, the thesis investigates the reaction of the Chinese administration, with at its head the Communist Party, against American cultural incursion that plainly impacted Chinese identity and sovereignty. It goes through three important performances which show how China converted a cultural struggle against American imperialism into a prosperous cultural move.
Diplôme : Doctorat En ligne : ../theses/anglais/BEL1521.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10965 Exemplaires
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Titre : Analyse des annotations dans les productions écrites des élèves de la 4ème année moyenne Type de document : texte imprimé Auteurs : Nadjia Bestandji, Auteur ; Daouia Hanachi, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 229 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Tags : annotation performance travail erreur performances work error ???????? ??????? ????? Index. décimale : 440 Langues romanes. Français Résumé : The annotation constitutes an essential device to help the pupils to improve their performances. Indeed, when a teacher gives an annotated work, the pupil, for little that it includes/understands the remarks that are made to him, has auto-évaluatives reactions that have effects on its later behaviors. Our study consisted in examining, on the one hand, the appreciations related to the copy, on the other hand, the way in which the errors are announced to the pupils. According to the result of the analysis, we made a certain number of proposals aiming at improving the FLE. Diplôme : Magistère En ligne : ../theses/francais/BES1333.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6328 Analyse des annotations dans les productions écrites des élèves de la 4ème année moyenne [texte imprimé] / Nadjia Bestandji, Auteur ; Daouia Hanachi, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2013 . - 229 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : annotation performance travail erreur performances work error ???????? ??????? ????? Index. décimale : 440 Langues romanes. Français Résumé : The annotation constitutes an essential device to help the pupils to improve their performances. Indeed, when a teacher gives an annotated work, the pupil, for little that it includes/understands the remarks that are made to him, has auto-évaluatives reactions that have effects on its later behaviors. Our study consisted in examining, on the one hand, the appreciations related to the copy, on the other hand, the way in which the errors are announced to the pupils. According to the result of the analysis, we made a certain number of proposals aiming at improving the FLE. Diplôme : Magistère En ligne : ../theses/francais/BES1333.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=6328 Exemplaires
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Titre : Simulation et optimisation d’un modèle de capteur cylindro-parabolique Type de document : texte imprimé Auteurs : Taqiy Eddine Boukelia, Auteur ; Mohamed-Salah Mecibah, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 173 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Tags : Cylindro-parabolique Centrale Optimisation Performance Rayonnement solaire Simulation Optimization Parabolic trough Plant Solar radiation ???? ????? ???? ????? ???? ???? ?? ??? ?????? ?????? Index. décimale : 620 Génie Mécanique Résumé : In the first part of thesis, we had started by the estimation of the Algerian solar radiation potential. Because the use of parabolic trough solar collectors implies that these systems only work with the direct normal irradiance (DNI). For this purpose, a proposed methodology for estimating the DNI in the presence or the absence of measured global and diffuse irradiances. When applying the proposed methodology for the calculation of DNI for three Algerian ground stations, we obtained better performances than those of five spatial databases data. Furthermore, an analysis of
optical and thermal performances of a parabolic trough solar collector has been presented. The solar radiation intercepted by the solar collector in different modes of tracking, the incidence angle modifier, the row shadowing and the end loss, in addition to the thermal losses and the conversion efficiency in every moment can be calculated using the developed model in this study.
The third part presents the design of the power block with a steam regenerative 50 MW
Rankine cycle, for solar installations with parabolic trough solar concentrators, and using two different fluids: thermic oil and molten salt. Due to the difference in the main stream parameters of the two power blocks, we can note that the power cycle efficiency at the assumed nominal conditions of the solar salt plant is higher than Therminol VP-1. While the fourth part of our study is based on evaluation and comparison of eight different configurations of these plants (with molten salt and thermic oil, with and without thermal storage system and backup system) in terms
of their design, thermodynamic yield (energetic and exergetic), economic factors and the environmental impacts. The results indicate that the configurations with integrated thermal energy storage and fossil fuel backup system are found to be more techno-economical, but on the other hand, they are less environment friendly.
In the last part, we optimized the two plants using the artificial neural network method. The results show that it is possible to get minimum values of LCOE of 8,3 and 7,0 cent $/kWh for oil and salt configurations, respectively. Moreover, a 4E (energy–exergy–environment–economic) comparison of the optimized plants is studied, in order to choose the best technology to be adapted in the viability study for Algerian locations. According to the feasibility analysis, the semi-arid and arid Algerian sites are suitable for realization of parabolic trough power plants with integrated
thermal energy storage and fuel backup system.Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU6864.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10178 Simulation et optimisation d’un modèle de capteur cylindro-parabolique [texte imprimé] / Taqiy Eddine Boukelia, Auteur ; Mohamed-Salah Mecibah, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2016 . - 173 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Tags : Cylindro-parabolique Centrale Optimisation Performance Rayonnement solaire Simulation Optimization Parabolic trough Plant Solar radiation ???? ????? ???? ????? ???? ???? ?? ??? ?????? ?????? Index. décimale : 620 Génie Mécanique Résumé : In the first part of thesis, we had started by the estimation of the Algerian solar radiation potential. Because the use of parabolic trough solar collectors implies that these systems only work with the direct normal irradiance (DNI). For this purpose, a proposed methodology for estimating the DNI in the presence or the absence of measured global and diffuse irradiances. When applying the proposed methodology for the calculation of DNI for three Algerian ground stations, we obtained better performances than those of five spatial databases data. Furthermore, an analysis of
optical and thermal performances of a parabolic trough solar collector has been presented. The solar radiation intercepted by the solar collector in different modes of tracking, the incidence angle modifier, the row shadowing and the end loss, in addition to the thermal losses and the conversion efficiency in every moment can be calculated using the developed model in this study.
The third part presents the design of the power block with a steam regenerative 50 MW
Rankine cycle, for solar installations with parabolic trough solar concentrators, and using two different fluids: thermic oil and molten salt. Due to the difference in the main stream parameters of the two power blocks, we can note that the power cycle efficiency at the assumed nominal conditions of the solar salt plant is higher than Therminol VP-1. While the fourth part of our study is based on evaluation and comparison of eight different configurations of these plants (with molten salt and thermic oil, with and without thermal storage system and backup system) in terms
of their design, thermodynamic yield (energetic and exergetic), economic factors and the environmental impacts. The results indicate that the configurations with integrated thermal energy storage and fossil fuel backup system are found to be more techno-economical, but on the other hand, they are less environment friendly.
In the last part, we optimized the two plants using the artificial neural network method. The results show that it is possible to get minimum values of LCOE of 8,3 and 7,0 cent $/kWh for oil and salt configurations, respectively. Moreover, a 4E (energy–exergy–environment–economic) comparison of the optimized plants is studied, in order to choose the best technology to be adapted in the viability study for Algerian locations. According to the feasibility analysis, the semi-arid and arid Algerian sites are suitable for realization of parabolic trough power plants with integrated
thermal energy storage and fuel backup system.Diplôme : Doctorat En ligne : ../theses/gmecanique/BOU6864.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10178 Exemplaires
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PermalinkRendement d'un capteur solaire à simple vitrage et à double vitrage << étude et comparaison >> / Rebiha Nadjem
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