4 résultat(s) recherche sur le tag 'solar radiation'    

Simulation et optimisation d’un modèle de capteur cylindro-parabolique / Taqiy Eddine Boukelia  

Public ISBD 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) Catégories : Français - Anglais Génie Mécanique 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 : pdf 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) Catégories : Français - Anglais Génie Mécanique 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 : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10178

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
BOU/6864	BOU/6864	Thèse	Bibliothèque principale	Thèses	Disponible

Efficacite photocatalytique des oxydes de fer (hematite) et des acides carboxyliques sur la degradation de derives phenoliques chlores en solution aqueuse / Wassila Remache  

Public ISBD Titre : Efficacite photocatalytique des oxydes de fer (hematite) et des acides carboxyliques sur la degradation de derives phenoliques chlores en solution aqueuse Type de document : texte imprimé Auteurs : Wassila Remache, Auteur ; Tahar Sehili, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 168 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Chimie Tags : 2,4-dichlorophénol  Photo-Fenton hétérogène  Oxyde de fer naturel  Fe(III) – carboxylate  Acide oxalique  Irradiation solaire  Solution aqueuse  Heterogeneous photo-Fenton  Natural iron oxide  Oxalic acid  Solar radiation  ????? ????????????  ????? ?????? ???????  ?????? ) -(III???????  ??? ?????????  ??????? ?????? Index. décimale : 540 Chimie et sciences connexes Résumé : The degradation of 2,4-DCP photoinduced by natural iron oxide was studied in aqueous suspension up on irradiation at 365 nm and by solar light. The effects of various factors, such as photolysis, adsorption, effect of pH, temperature, wavelength and the degradation pathways were investigated. The UV light has no considerable influence on the catalytic activity of the NIO, it is very important to note that there is a strong overlap between the absorption spectrum of NIO and the solar emission spectrum of the sun leading the capacity of this oxide to photoinduce the degradation of 2,4-DCP under solar light. 2,4-DCP was nearly completely removed in about 6 h. The second part of the work of this thesis has demonstrated the significant impact that could have sunlight on the activation of iron-carboxylate complexes in the degradation of 2,4-DCP. The complex iron-oxalate was found the most photocative for the degradation of 2,4-DCP in both systems (UV and solar irradiation). Photochemical behavior of iron released into solution, mostly influenced by pH, will monitor the effectiveness of the reaction disappearance of the pollutant. Our results showed that photocatalysis in the iron-oxalate system is an effective technique for the degradation of 2,4-DCP where seven major by-products were identified and that this degradation mainly through hydroxyle radicals •OH. Mineralization of 2,4-DCP was achieved in 11h in our experimental conditions. Furthermore, in the heterogeneous iron oxide /H2O2 system the method is effective only at acidic conditions and the disappearance of 2,4-DCP is strongly dependent on the concentration of H2O2 , substrate and catalyst dose. The photodegradation of 2,4-DCP can be directly attributed to the attack of •OH radicals. 2,4-DCP is totally degraded that after formation of various by-products can be completely mineralized to H2O, Cl- et CO2. Our work shows that the activation of natural iron oxide by carboxylic acids and hydrogen peroxide could have a considerable impact on the fate of organic pollutants in aquatic environment. Diplôme : Doctorat en sciences En ligne : ../theses/chimie/REM7256.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10854 Efficacite photocatalytique des oxydes de fer (hematite) et des acides carboxyliques sur la degradation de derives phenoliques chlores en solution aqueuse [texte imprimé] / Wassila Remache, Auteur ; Tahar Sehili, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2018 . - 168 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Chimie Tags : 2,4-dichlorophénol  Photo-Fenton hétérogène  Oxyde de fer naturel  Fe(III) – carboxylate  Acide oxalique  Irradiation solaire  Solution aqueuse  Heterogeneous photo-Fenton  Natural iron oxide  Oxalic acid  Solar radiation  ????? ????????????  ????? ?????? ???????  ?????? ) -(III???????  ??? ?????????  ??????? ?????? Index. décimale : 540 Chimie et sciences connexes Résumé : The degradation of 2,4-DCP photoinduced by natural iron oxide was studied in aqueous suspension up on irradiation at 365 nm and by solar light. The effects of various factors, such as photolysis, adsorption, effect of pH, temperature, wavelength and the degradation pathways were investigated. The UV light has no considerable influence on the catalytic activity of the NIO, it is very important to note that there is a strong overlap between the absorption spectrum of NIO and the solar emission spectrum of the sun leading the capacity of this oxide to photoinduce the degradation of 2,4-DCP under solar light. 2,4-DCP was nearly completely removed in about 6 h. The second part of the work of this thesis has demonstrated the significant impact that could have sunlight on the activation of iron-carboxylate complexes in the degradation of 2,4-DCP. The complex iron-oxalate was found the most photocative for the degradation of 2,4-DCP in both systems (UV and solar irradiation). Photochemical behavior of iron released into solution, mostly influenced by pH, will monitor the effectiveness of the reaction disappearance of the pollutant. Our results showed that photocatalysis in the iron-oxalate system is an effective technique for the degradation of 2,4-DCP where seven major by-products were identified and that this degradation mainly through hydroxyle radicals •OH. Mineralization of 2,4-DCP was achieved in 11h in our experimental conditions. Furthermore, in the heterogeneous iron oxide /H2O2 system the method is effective only at acidic conditions and the disappearance of 2,4-DCP is strongly dependent on the concentration of H2O2 , substrate and catalyst dose. The photodegradation of 2,4-DCP can be directly attributed to the attack of •OH radicals. 2,4-DCP is totally degraded that after formation of various by-products can be completely mineralized to H2O, Cl- et CO2. Our work shows that the activation of natural iron oxide by carboxylic acids and hydrogen peroxide could have a considerable impact on the fate of organic pollutants in aquatic environment. Diplôme : Doctorat en sciences En ligne : ../theses/chimie/REM7256.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10854

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
REM/7256	REM/7256	Thèse	Bibliothèque principale	Thèses	Disponible

Etude du champ solaire d’une centrale thermique hybride de production d’electricite. / Adel Miles  

Public ISBD Titre : Etude du champ solaire d’une centrale thermique hybride de production d’electricite. Type de document : texte imprimé Auteurs : Adel Miles, Auteur ; O. Khemis, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 145 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Génie Mécanique Tags : solaire thermodynamique, concentration, Cylindro-parabolique  Centrale  Optimisation  Performance  Rayonnement solaire  Simulation  solar thermodynamics, concentration, Parabolic trough  Power station  Optimization  Solar radiation  ?????? ??????? ????????  ??????  ???? ???? ?? ????? ???????  ????????  ?????? ??????? Index. décimale : 620 Génie Mécanique Résumé : The work presented in this thesis is a contribution to the study of the production of electricity by a hybrid thermal power plant exploiting the solar field on the one hand and natural gas on the other hand. This work concerns firstly the evaluation of the thermodynamic performances of a solargas hybrid thermal power system with a power of 150 MW, the method of energy analysis was used in this thesis. This method is used to determine the main parameters in order to achieve improvements in system performance. The development of the analysis model in this thesis is carried out by determining the thermal and solar efficiency as well as the efficiency of solar electricity. Due to the calculation of the thermal and solar performances in typical days and an average of the days of the year, we used simulation software "Aspen Plus" to determine the thermodynamic parameters of the hybrid plant in the case of Algerian weather conditions. As well as the System Advisor Model (SAM), this gives a methodology and information particularly on cylindro-parabolic shapes concerning the part of the solar field in the system studied. The results are calculated hour by hour from sunrise to sunset. The second part of this work is being improved in the overall efficiency of the plant with two levels of pressure that directly affects the capacity of the steam turbine in the power block. In the third part, an optimization of the power at the level of the steam turbine is also carried out. The optimization was carried out in the power block which contains two gas turbines and a double pressure steam cycle where the high pressure part is only heated. Preliminary simulations for this system have shown that the steam turbine cycle can achieve optimum conditions for reheating and low vapor pressure, which would enhance the performance of the system. The fourth part concerns the comparison of the key parameters of the thermal power plant in different sites based on the economic factor (LCOE), the configuration of the solar field section and the line spacing or the so-called effect of shading. The exploitation of the "Aspen plus" and "SAM" software enabled us to establish models of optimal hybrid power plants (solar-gas) in the arid zone of Algeria. Such a study is a reference for the construction and site selection of the installation of this type of power plant. Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/MIL7126.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10476 Etude du champ solaire d’une centrale thermique hybride de production d’electricite. [texte imprimé] / Adel Miles, Auteur ; O. Khemis, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 145 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Génie Mécanique Tags : solaire thermodynamique, concentration, Cylindro-parabolique  Centrale  Optimisation  Performance  Rayonnement solaire  Simulation  solar thermodynamics, concentration, Parabolic trough  Power station  Optimization  Solar radiation  ?????? ??????? ????????  ??????  ???? ???? ?? ????? ???????  ????????  ?????? ??????? Index. décimale : 620 Génie Mécanique Résumé : The work presented in this thesis is a contribution to the study of the production of electricity by a hybrid thermal power plant exploiting the solar field on the one hand and natural gas on the other hand. This work concerns firstly the evaluation of the thermodynamic performances of a solargas hybrid thermal power system with a power of 150 MW, the method of energy analysis was used in this thesis. This method is used to determine the main parameters in order to achieve improvements in system performance. The development of the analysis model in this thesis is carried out by determining the thermal and solar efficiency as well as the efficiency of solar electricity. Due to the calculation of the thermal and solar performances in typical days and an average of the days of the year, we used simulation software "Aspen Plus" to determine the thermodynamic parameters of the hybrid plant in the case of Algerian weather conditions. As well as the System Advisor Model (SAM), this gives a methodology and information particularly on cylindro-parabolic shapes concerning the part of the solar field in the system studied. The results are calculated hour by hour from sunrise to sunset. The second part of this work is being improved in the overall efficiency of the plant with two levels of pressure that directly affects the capacity of the steam turbine in the power block. In the third part, an optimization of the power at the level of the steam turbine is also carried out. The optimization was carried out in the power block which contains two gas turbines and a double pressure steam cycle where the high pressure part is only heated. Preliminary simulations for this system have shown that the steam turbine cycle can achieve optimum conditions for reheating and low vapor pressure, which would enhance the performance of the system. The fourth part concerns the comparison of the key parameters of the thermal power plant in different sites based on the economic factor (LCOE), the configuration of the solar field section and the line spacing or the so-called effect of shading. The exploitation of the "Aspen plus" and "SAM" software enabled us to establish models of optimal hybrid power plants (solar-gas) in the arid zone of Algeria. Such a study is a reference for the construction and site selection of the installation of this type of power plant. Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/MIL7126.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10476

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
MIL/7126	MIL/7126	Thèse	Bibliothèque principale	Thèses	Disponible

Production d’hydrogène par électrolyse sous chauffage solaire par un concentrateur paraboloïdale / Khaled Mahdi  

Public ISBD Titre : Production d’hydrogène par électrolyse sous chauffage solaire par un concentrateur paraboloïdale Type de document : texte imprimé Auteurs : Khaled Mahdi, Auteur ; N. Bellel, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2015 Importance : 161 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Physique Tags : rayonnement solaire  paraboloïde  récepteur cylindrique  électrolyseur  hydrogène  solar radiation  paraboloïdal  cylindrical receiver  electrolyser  hydrogen  ??????? ??????  ???? ?????  ???? ???????  ?????????? Index. décimale : 530 Physique Résumé : In order not to promote degrade the environment; people had sought to replace Natural non-renewable resources such as fossil fuels by developing technologies that are based on renewable resources. An example of such technology is solar energy. In this paper, we show a design and an experimental and numerical analysis with the use of FLUENT software receiver thermal behavior of a solar parabolic concentrator as a prototype for the production of steam which can be coupled with a turbine to produce electricity or steam engine, this electricity can be stoker with the electrolysis process in the form of hydrogen Diplôme : Doctorat en sciences En ligne : ../theses/physique/MAH6763.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9850 Production d’hydrogène par électrolyse sous chauffage solaire par un concentrateur paraboloïdale [texte imprimé] / Khaled Mahdi, Auteur ; N. Bellel, Directeur de thèse . - constantine (Route ain el bey, Algérie) : Université Constantine 1, 2015 . - 161 f. ; 30 cm. 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais Physique Tags : rayonnement solaire  paraboloïde  récepteur cylindrique  électrolyseur  hydrogène  solar radiation  paraboloïdal  cylindrical receiver  electrolyser  hydrogen  ??????? ??????  ???? ?????  ???? ???????  ?????????? Index. décimale : 530 Physique Résumé : In order not to promote degrade the environment; people had sought to replace Natural non-renewable resources such as fossil fuels by developing technologies that are based on renewable resources. An example of such technology is solar energy. In this paper, we show a design and an experimental and numerical analysis with the use of FLUENT software receiver thermal behavior of a solar parabolic concentrator as a prototype for the production of steam which can be coupled with a turbine to produce electricity or steam engine, this electricity can be stoker with the electrolysis process in the form of hydrogen Diplôme : Doctorat en sciences En ligne : ../theses/physique/MAH6763.pdf Format de la ressource électronique : pdf Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=9850

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
MAH/6763	MAH/6763	Thèse	Bibliothèque principale	Thèses	Disponible