K. Touafek - Academia.edu (original) (raw)
Papers by K. Touafek
Hybrid photovoltaic thermal (PVT) collectors allow simultaneous production of electrical energy t... more Hybrid photovoltaic thermal (PVT) collectors allow simultaneous production of electrical energy thus heat energy. There are several configurations of hybrid collectors (to produce water or air). For hybrids water collectors, there are several configurations that differ by the nature of the absorber (serpentine, tubes...). In this paper, an absorber tank is studied. The circulation of the coolant is natural (we do not use the pump). We present the obtained results in our experimental study and we analyzed the data, and then we compare the results with the theory practices. The electrical performances of the hybrid collector are compared with those of conventional photovoltaic module mounted on the same structure and measured under the same conditions. We conducted experiments with natural circulation of the coolant (Thermosyphon), for a flow rate of 0.025kg/m².
Hybrid photovoltaic thermal (PV/T) solar system comprises a solar collector which is disposed on ... more Hybrid photovoltaic thermal (PV/T) solar system comprises a solar collector which is disposed on photovoltaic solar cells. The disadvantage of a conventional photovoltaic cell is that its performance decreases as the temperature increases. Indeed, part of the solar radiation is converted into electricity and is dissipated as heat, increasing the temperature of the photovoltaic cell with respect to the ambient temperature. The objective of this work is to study experimentally and implement a hybrid prototype to evaluate electrical and thermal performance. In this paper, an experimental study of two new configurations of hybrid collectors is exposed. The results are given and interpreted. The two configurations of absorber studied are a new combination with tubes and galvanized tank, the other is a tubes and sheet.
cder.edu.dz
Résumé-La combinaison d'un capteur thermique et d'un panneau photovoltaïque dans un seu... more Résumé-La combinaison d'un capteur thermique et d'un panneau photovoltaïque dans un seul capteur permet l'augmentation de l'efficacité de la conversion totale de l'énergie solaire. Un effet de synergie peut être obtenu dans une structure associant ces deux dispositifs de ...
Simulation numérique du comportement thermique du capteur
Resume – L’idee de developpement durable est explicitee a travers ‘une approche globale, economiq... more Resume – L’idee de developpement durable est explicitee a travers ‘une approche globale, economique, environnementale et sociale du developpement’. Les differents principes de la Declaration de Rio de 1992 sont presentes. Ils concernent la participation, la precaution, l’evaluation environnementale et le pollueur-payeur avec une approche economique. La population est finalement amenee a reflechir sur le developpement durable, lequel est ensuite mis en relation avec la periurbanisation. La crise environnementale que connait actuellement la terre marque les limites de la science et du progres technologique. Elle remet en cause bien des certitudes. L'environnement physique et biologique a ete au cœur des discussions de la Conference de Rio. Le Sommet de Johannesburg vise a concilier les imperatifs sociaux, economiques et environnementaux dans une nouvelle demarche : le developpement durable. Les changements climatiques sont une realite confirmee par les experts scientifiques. Mais,...
L'energie dans une habitation necessaire pour l'eclairage, le chauffage ou la climatisati... more L'energie dans une habitation necessaire pour l'eclairage, le chauffage ou la climatisation est obtenue en generale du reseau basse tension. Pour des raisons de l'impossibilite de se raccorder au reseau oude son cout eleve, l'utilisation des energies renouvelables est une alternative ideale. En effet, l'energie electrique et thermique necessaire peuvent etre obtenues a partir d'un systeme a base d'une pile a combustible, car cette derniere a un rendement superieur a 40% [1], son fonctionnement est silencieux et de petite dimension. La presente communication traite l'etude de l'alimentation d'une habitation avec une installation basee sur la pile a combustible a membrane echangeuse de proton (MEP) qui fonctionne avec le gaz naturel, une pompe a chaleur ainsi qu 'un reservoir de stockage thermique.
the hybrid solar photovoltaic thermal PV/T offers an interesting option now; because the absorbed... more the hybrid solar photovoltaic thermal PV/T offers an interesting option now; because the absorbed solar radiation is converted into electric energy and heat (the conversion can be performed simultaneously or separately). The objective of this work is to study numerically and of the hybrid collector PVT for measuring the thermal performance. The results suggest that this type of collector is a good alternative to conventional photovoltaic modules and thermal collectors installed separately. Résumé – les capteurs hybrides solaires photovoltaïque thermique PV/T offrent une option intéressante; le rayonnement solaire absorbée est convertie en deux forms d’énergie électrique et thermique (la conversion peut être effectuée simultanément ou séparément). L'objectif de ce travail est d'étudier numériquement un capteur hybride PVT pour mesurer les performances thermique. Les résultats suggèrent que ce type de collecteur est une bonne alternative aux modules photovoltaïques classiques ...
The photovoltaic collectors have proved great efficiency in the solar energy power conversion; ho... more The photovoltaic collectors have proved great efficiency in the solar energy power conversion; however, different PV and hybrid thermal collectors are being attracting many researchers. Throughout this attempt, a PVT based on thin-film solar cells based on different technologies (binary, ternary and quaternary materials) has been put in reliability study. In this paper different generations have been discussed. The energy balance equations for different configurations have been described. The analytical expressions for electrical and thermal efficiencies have been calculated through a Matlab simulation (1D) and ANSYS Software (3D). It has been averred that the obtained efficiency by the PVT collectors based on cadmium telluride (CdTe), copper indium diselenide (CIS) and copper indium gallium diselenide (CIGS) is more important than once obtained by PVT collectors based on silicon and amorphous silicon (a-Si), within a rate from 47% to 57%, furthermore, with this kind of PVT, the out...
Hybrid Photovoltaic thermal (PVT) collector convert solar energy into electrical and thermal ener... more Hybrid Photovoltaic thermal (PVT) collector convert solar energy into electrical and thermal energy simultaneously. The energy output of this collector is low due to their low power conversion efficiencies. Planer reflectors are used to improve the power output of PVT collector, by increasing the effective capture area. The performance of the solar collector with reflector depends length of reflector, tilt angle and reflectivity. Hence, it is necessary to choose the optimum values of these parameters to attain a maximum of power of collector. In this study, an optimization of the angle of inclination of two reflectors during the year was done. These rectangular reflectors in mirror placed on the lateral sides of a hybrid PVT water collector. A particle swarm optimization (PSO) method is used in this study. An increase of 23% for solar radiation incident on the collector surface with the addition of the planers reflectors, this increase causes an improvement of the performance of the...
La decomposition de l’eau est un des procedes chimiques les plus attractifs pour la production de... more La decomposition de l’eau est un des procedes chimiques les plus attractifs pour la production de l’hydrogene et le stockage futur de l’energie. L’eau, matiere abondante et a cout de revient tres faible ou nul, recele sous forme combinee d’un produit (hydrogene) qui presente des proprietes particulierement interessantes. En fait, c’est un vecteur energetique [3], c’est-a-dire que sa production peut etre consideree comme un moyen de stocker ou de transporter l’energie, en plus c’est un compose utilise comme produit intermediaire dans divers procedes industriels, tels que: synthese d’hydrocarbures ou d’autres produits organiques. La reaction de decomposition de l’eau peut etre realisee a l’aide de l’energie electrique, comme c’est le cas de l’electrolyse de l’eau qui semblerait etre la solution la plus fiable pour resoudre le probleme futur d’une production massive d’hydrogene. Procedes electrolytiques Les procedes electrolytiques ont fait l’objet d’un grand nombre de travaux de reche...
Durant la conversion photovoltaique du capteur solaire, une chaleur est generee, ce qui augmenter... more Durant la conversion photovoltaique du capteur solaire, une chaleur est generee, ce qui augmentera la temperature de la cellule photovoltaique et causera une chute de son rendement. Ce phenomene est du a la partie du rayonnement solaire non absorbee par les cellules et qui sera a l'origine de son echauffement. Cet echauffement a ete considere comme nefaste pour le rendement des Capteurs solaires photovoltaiques, et plusieurs efforts ont ete consentis pour evacuer cette chaleur. Il y a eu aussi l'aide (...)
International Journal of Energy and Environmental Engineering
Experimental studies confirm that the obtained electrical power by a conventional photovoltaic PV... more Experimental studies confirm that the obtained electrical power by a conventional photovoltaic PV system is progressively degraded when the temperature of its cells is increased. The water-cooled photovoltaic thermal PVT system is therefore proposed to avoid the voltage drop at high temperature. The use of single diode PV/PVT models in simulation software becomes indispensable to analyze its performances where several climatic conditions such as environmental temperature and solar radiation variations should be considered. An optimal set of PV/PVT model parameters are determined through experimental data using two evolutionary computation algorithms; genetic algorithm and particle swarm optimization algorithm. Furthermore, the robustness of the given PV/PVT model should be analyzed. The predicted electrical properties by the proposed PVT model are compared with those given by the conventional PV model at its operating cell conditions and also at several rigid atmospheric conditions.
Journal of Solar Energy Engineering, 2016
Within the solar energy technologies, the hybrid photovoltaic–thermal (PVT) systems offer an attr... more Within the solar energy technologies, the hybrid photovoltaic–thermal (PVT) systems offer an attractive option because the absorbed solar radiation is converted into thermal and electrical energies (the conversion can be done separately or simultaneously). In this study, an attempt has been made to evaluate the theoretical and practical performances and evaluation of a hybrid PVT collector based on a new integrated absorber configuration function of climatic and design parameters. Our objective is to obtain a more efficient use of solar energy by cheaper materials and simpler implementation. On the first hand, we considered two different configurations of hybrid collectors which are defined as PVT water with absorber in parallel vertical tubes (model I) and a PVT with absorber in an enclosure (model II). On the second hand, we presented a new integrated absorber configuration for hybrid collector; then we compared it to the two previous models. The last proposed design has the advan...
Renewable Energy and Environmental Sustainability, 2016
The present study investigates the possibility of using a stand-alone photovoltaic/LPG (liquid pe... more The present study investigates the possibility of using a stand-alone photovoltaic/LPG (liquid petroleum gas) generator hybrid power system for low-cost electricity production which can satisfy the energy load requirements of a typical remote and isolated rural area. In this context, the optimal dimensions to improve the technical and economical performances of the hybrid system are determined according to the load energy requirements. The proposed system's installation and operating costs are simulated using the Hybrid Optimization Model for Electric Renewable (HOMER), the solar radiation and the system components costs as inputs; and then compared with those of other supply options such as diesel generation.
During operation of a photovoltaic module, a heat is generated, which systematically increase the... more During operation of a photovoltaic module, a heat is generated, which systematically increase the temperature of the photovoltaic cell with respect to the ambient temperature and this will cause a drop in performance. Several research projects aimed at developing solutions to limit the rise in temperature of photovoltaic modules, is born beyond the concept of hybrid photovoltaic thermal collectors / (PV / T), which is to superimpose both electrical and thermal energy functions. In this hybrid collector, the fluid flowing in the thermal part to be heated also cools the photovoltaic cells and thereby increases their electric yield. These absorber tubes can have different shapes: round, square and rectangular tubes. In this paper a new configuration of absorber is studied. A thermal and electrical model is performed and tested.
The thin-film solar cells are becoming increasingly used in various applications; this is mainly ... more The thin-film solar cells are becoming increasingly used in various applications; this is mainly due to the continued high cost of mono or polycrystalline silicon. In addition, the thin film technology offers the most diverse applications including uses low solar irradiance. The main fields of thin film solar cells are: the chain of amorphous silicon (a-Si), the chain of cadmium telluride (CdTe) and chalcopyrite sector (CIS and CIGS material). In this paper, a study on the influence of light and temperature on the characteristics I (V) of different thin film photovoltaic cells (a-Si:H single, a-Si:H tandem a-Si:H tripple, CdTe and CIS) is detailed. Under standard conditions (illumination of 1000W/m 2 and cell temperature 25° C), we see that the CdTe is the closest that the monocrystalline silicon which has a maximum value of short circuit current material (3,26A).
IET Renewable Power Generation, 2014
In this paper, a theoretical and experimental study of a photovoltaic thermal (PV/T) hybrid solar... more In this paper, a theoretical and experimental study of a photovoltaic thermal (PV/T) hybrid solar collector is presented. The studied system is constituted by a sheet and tube placed below the surface on which the solar cells are assembled to extract heat from the photovoltaic module. The mathematical model is based on the equations of the energy balances written for the various nodes of the system, and the coupled differential equations obtained are solved by using the finite differences method. The temperatures of the various layers of solar PV/T collector and the coolant temperature are predicted. With the hybrid solar collector presented in this article, the temperature at the maximum photovoltaic cell is reached 53 °C; we see that the integration of the heat exchanger at the photovoltaic collector reduces the temperature of the PV cell that which increases its efficiency, in the other hand, the gain of these calories is used for heating the fluid. We obtained an overall efficiency which is the sum of the electrical efficiency and thermal efficiency for irradiation conditions chosen equal to 64%. The results of experimental study were compared with theoretical data and the model was validated.
Energy and Buildings, 2013
ABSTRACT Hybrid photovoltaic thermal (or simply PV/T) collectors are devices that simultaneously ... more ABSTRACT Hybrid photovoltaic thermal (or simply PV/T) collectors are devices that simultaneously convert solar energy into electricity and heat. The improving of the electrical efficiency, by reducing the photovoltaic collector's temperature, as well as taking advantage of the thermal energy produced, constitutes the basic idea in the development of hybrid PV/T collectors. A new design of hybrid collectors for air heating is presented in this paper. The theoretical study is carried out through the numerical modeling, and the results of the simulation are integrally developed; witch a prototype is realized. Experimental validation of the mathematical model as well as the study of the thermal and electric performance is detailed. The application of this new design has given a good thermal and electric performance compared to the traditional hybrid collectors. Its simplicity of implementation and its easy integration in buildings make them more competitive.
Résumé Afin de maximiser la production d’électricité d’une installation photovoltaïque, il convie... more Résumé Afin de maximiser la production d’électricité d’une installation photovoltaïque, il convient d’orienter les modules de façon optimale afin de capter un maximum du rayonnement solaire. En effet, la direction du soleil est importante. L’objectif de ce travail consiste à évaluer l’intérêt énergétique (le gain) de la correction d’angle d’inclinaison des modules photovoltaïques orientés plein sud dans un système énergétique hybride photovoltaïque / groupe électrogène.
Applied Thermal Engineering
Hybrid photovoltaic thermal (PVT) collectors allow simultaneous production of electrical energy t... more Hybrid photovoltaic thermal (PVT) collectors allow simultaneous production of electrical energy thus heat energy. There are several configurations of hybrid collectors (to produce water or air). For hybrids water collectors, there are several configurations that differ by the nature of the absorber (serpentine, tubes...). In this paper, an absorber tank is studied. The circulation of the coolant is natural (we do not use the pump). We present the obtained results in our experimental study and we analyzed the data, and then we compare the results with the theory practices. The electrical performances of the hybrid collector are compared with those of conventional photovoltaic module mounted on the same structure and measured under the same conditions. We conducted experiments with natural circulation of the coolant (Thermosyphon), for a flow rate of 0.025kg/m².
Hybrid photovoltaic thermal (PV/T) solar system comprises a solar collector which is disposed on ... more Hybrid photovoltaic thermal (PV/T) solar system comprises a solar collector which is disposed on photovoltaic solar cells. The disadvantage of a conventional photovoltaic cell is that its performance decreases as the temperature increases. Indeed, part of the solar radiation is converted into electricity and is dissipated as heat, increasing the temperature of the photovoltaic cell with respect to the ambient temperature. The objective of this work is to study experimentally and implement a hybrid prototype to evaluate electrical and thermal performance. In this paper, an experimental study of two new configurations of hybrid collectors is exposed. The results are given and interpreted. The two configurations of absorber studied are a new combination with tubes and galvanized tank, the other is a tubes and sheet.
cder.edu.dz
Résumé-La combinaison d'un capteur thermique et d'un panneau photovoltaïque dans un seu... more Résumé-La combinaison d'un capteur thermique et d'un panneau photovoltaïque dans un seul capteur permet l'augmentation de l'efficacité de la conversion totale de l'énergie solaire. Un effet de synergie peut être obtenu dans une structure associant ces deux dispositifs de ...
Simulation numérique du comportement thermique du capteur
Resume – L’idee de developpement durable est explicitee a travers ‘une approche globale, economiq... more Resume – L’idee de developpement durable est explicitee a travers ‘une approche globale, economique, environnementale et sociale du developpement’. Les differents principes de la Declaration de Rio de 1992 sont presentes. Ils concernent la participation, la precaution, l’evaluation environnementale et le pollueur-payeur avec une approche economique. La population est finalement amenee a reflechir sur le developpement durable, lequel est ensuite mis en relation avec la periurbanisation. La crise environnementale que connait actuellement la terre marque les limites de la science et du progres technologique. Elle remet en cause bien des certitudes. L'environnement physique et biologique a ete au cœur des discussions de la Conference de Rio. Le Sommet de Johannesburg vise a concilier les imperatifs sociaux, economiques et environnementaux dans une nouvelle demarche : le developpement durable. Les changements climatiques sont une realite confirmee par les experts scientifiques. Mais,...
L'energie dans une habitation necessaire pour l'eclairage, le chauffage ou la climatisati... more L'energie dans une habitation necessaire pour l'eclairage, le chauffage ou la climatisation est obtenue en generale du reseau basse tension. Pour des raisons de l'impossibilite de se raccorder au reseau oude son cout eleve, l'utilisation des energies renouvelables est une alternative ideale. En effet, l'energie electrique et thermique necessaire peuvent etre obtenues a partir d'un systeme a base d'une pile a combustible, car cette derniere a un rendement superieur a 40% [1], son fonctionnement est silencieux et de petite dimension. La presente communication traite l'etude de l'alimentation d'une habitation avec une installation basee sur la pile a combustible a membrane echangeuse de proton (MEP) qui fonctionne avec le gaz naturel, une pompe a chaleur ainsi qu 'un reservoir de stockage thermique.
the hybrid solar photovoltaic thermal PV/T offers an interesting option now; because the absorbed... more the hybrid solar photovoltaic thermal PV/T offers an interesting option now; because the absorbed solar radiation is converted into electric energy and heat (the conversion can be performed simultaneously or separately). The objective of this work is to study numerically and of the hybrid collector PVT for measuring the thermal performance. The results suggest that this type of collector is a good alternative to conventional photovoltaic modules and thermal collectors installed separately. Résumé – les capteurs hybrides solaires photovoltaïque thermique PV/T offrent une option intéressante; le rayonnement solaire absorbée est convertie en deux forms d’énergie électrique et thermique (la conversion peut être effectuée simultanément ou séparément). L'objectif de ce travail est d'étudier numériquement un capteur hybride PVT pour mesurer les performances thermique. Les résultats suggèrent que ce type de collecteur est une bonne alternative aux modules photovoltaïques classiques ...
The photovoltaic collectors have proved great efficiency in the solar energy power conversion; ho... more The photovoltaic collectors have proved great efficiency in the solar energy power conversion; however, different PV and hybrid thermal collectors are being attracting many researchers. Throughout this attempt, a PVT based on thin-film solar cells based on different technologies (binary, ternary and quaternary materials) has been put in reliability study. In this paper different generations have been discussed. The energy balance equations for different configurations have been described. The analytical expressions for electrical and thermal efficiencies have been calculated through a Matlab simulation (1D) and ANSYS Software (3D). It has been averred that the obtained efficiency by the PVT collectors based on cadmium telluride (CdTe), copper indium diselenide (CIS) and copper indium gallium diselenide (CIGS) is more important than once obtained by PVT collectors based on silicon and amorphous silicon (a-Si), within a rate from 47% to 57%, furthermore, with this kind of PVT, the out...
Hybrid Photovoltaic thermal (PVT) collector convert solar energy into electrical and thermal ener... more Hybrid Photovoltaic thermal (PVT) collector convert solar energy into electrical and thermal energy simultaneously. The energy output of this collector is low due to their low power conversion efficiencies. Planer reflectors are used to improve the power output of PVT collector, by increasing the effective capture area. The performance of the solar collector with reflector depends length of reflector, tilt angle and reflectivity. Hence, it is necessary to choose the optimum values of these parameters to attain a maximum of power of collector. In this study, an optimization of the angle of inclination of two reflectors during the year was done. These rectangular reflectors in mirror placed on the lateral sides of a hybrid PVT water collector. A particle swarm optimization (PSO) method is used in this study. An increase of 23% for solar radiation incident on the collector surface with the addition of the planers reflectors, this increase causes an improvement of the performance of the...
La decomposition de l’eau est un des procedes chimiques les plus attractifs pour la production de... more La decomposition de l’eau est un des procedes chimiques les plus attractifs pour la production de l’hydrogene et le stockage futur de l’energie. L’eau, matiere abondante et a cout de revient tres faible ou nul, recele sous forme combinee d’un produit (hydrogene) qui presente des proprietes particulierement interessantes. En fait, c’est un vecteur energetique [3], c’est-a-dire que sa production peut etre consideree comme un moyen de stocker ou de transporter l’energie, en plus c’est un compose utilise comme produit intermediaire dans divers procedes industriels, tels que: synthese d’hydrocarbures ou d’autres produits organiques. La reaction de decomposition de l’eau peut etre realisee a l’aide de l’energie electrique, comme c’est le cas de l’electrolyse de l’eau qui semblerait etre la solution la plus fiable pour resoudre le probleme futur d’une production massive d’hydrogene. Procedes electrolytiques Les procedes electrolytiques ont fait l’objet d’un grand nombre de travaux de reche...
Durant la conversion photovoltaique du capteur solaire, une chaleur est generee, ce qui augmenter... more Durant la conversion photovoltaique du capteur solaire, une chaleur est generee, ce qui augmentera la temperature de la cellule photovoltaique et causera une chute de son rendement. Ce phenomene est du a la partie du rayonnement solaire non absorbee par les cellules et qui sera a l'origine de son echauffement. Cet echauffement a ete considere comme nefaste pour le rendement des Capteurs solaires photovoltaiques, et plusieurs efforts ont ete consentis pour evacuer cette chaleur. Il y a eu aussi l'aide (...)
International Journal of Energy and Environmental Engineering
Experimental studies confirm that the obtained electrical power by a conventional photovoltaic PV... more Experimental studies confirm that the obtained electrical power by a conventional photovoltaic PV system is progressively degraded when the temperature of its cells is increased. The water-cooled photovoltaic thermal PVT system is therefore proposed to avoid the voltage drop at high temperature. The use of single diode PV/PVT models in simulation software becomes indispensable to analyze its performances where several climatic conditions such as environmental temperature and solar radiation variations should be considered. An optimal set of PV/PVT model parameters are determined through experimental data using two evolutionary computation algorithms; genetic algorithm and particle swarm optimization algorithm. Furthermore, the robustness of the given PV/PVT model should be analyzed. The predicted electrical properties by the proposed PVT model are compared with those given by the conventional PV model at its operating cell conditions and also at several rigid atmospheric conditions.
Journal of Solar Energy Engineering, 2016
Within the solar energy technologies, the hybrid photovoltaic–thermal (PVT) systems offer an attr... more Within the solar energy technologies, the hybrid photovoltaic–thermal (PVT) systems offer an attractive option because the absorbed solar radiation is converted into thermal and electrical energies (the conversion can be done separately or simultaneously). In this study, an attempt has been made to evaluate the theoretical and practical performances and evaluation of a hybrid PVT collector based on a new integrated absorber configuration function of climatic and design parameters. Our objective is to obtain a more efficient use of solar energy by cheaper materials and simpler implementation. On the first hand, we considered two different configurations of hybrid collectors which are defined as PVT water with absorber in parallel vertical tubes (model I) and a PVT with absorber in an enclosure (model II). On the second hand, we presented a new integrated absorber configuration for hybrid collector; then we compared it to the two previous models. The last proposed design has the advan...
Renewable Energy and Environmental Sustainability, 2016
The present study investigates the possibility of using a stand-alone photovoltaic/LPG (liquid pe... more The present study investigates the possibility of using a stand-alone photovoltaic/LPG (liquid petroleum gas) generator hybrid power system for low-cost electricity production which can satisfy the energy load requirements of a typical remote and isolated rural area. In this context, the optimal dimensions to improve the technical and economical performances of the hybrid system are determined according to the load energy requirements. The proposed system's installation and operating costs are simulated using the Hybrid Optimization Model for Electric Renewable (HOMER), the solar radiation and the system components costs as inputs; and then compared with those of other supply options such as diesel generation.
During operation of a photovoltaic module, a heat is generated, which systematically increase the... more During operation of a photovoltaic module, a heat is generated, which systematically increase the temperature of the photovoltaic cell with respect to the ambient temperature and this will cause a drop in performance. Several research projects aimed at developing solutions to limit the rise in temperature of photovoltaic modules, is born beyond the concept of hybrid photovoltaic thermal collectors / (PV / T), which is to superimpose both electrical and thermal energy functions. In this hybrid collector, the fluid flowing in the thermal part to be heated also cools the photovoltaic cells and thereby increases their electric yield. These absorber tubes can have different shapes: round, square and rectangular tubes. In this paper a new configuration of absorber is studied. A thermal and electrical model is performed and tested.
The thin-film solar cells are becoming increasingly used in various applications; this is mainly ... more The thin-film solar cells are becoming increasingly used in various applications; this is mainly due to the continued high cost of mono or polycrystalline silicon. In addition, the thin film technology offers the most diverse applications including uses low solar irradiance. The main fields of thin film solar cells are: the chain of amorphous silicon (a-Si), the chain of cadmium telluride (CdTe) and chalcopyrite sector (CIS and CIGS material). In this paper, a study on the influence of light and temperature on the characteristics I (V) of different thin film photovoltaic cells (a-Si:H single, a-Si:H tandem a-Si:H tripple, CdTe and CIS) is detailed. Under standard conditions (illumination of 1000W/m 2 and cell temperature 25° C), we see that the CdTe is the closest that the monocrystalline silicon which has a maximum value of short circuit current material (3,26A).
IET Renewable Power Generation, 2014
In this paper, a theoretical and experimental study of a photovoltaic thermal (PV/T) hybrid solar... more In this paper, a theoretical and experimental study of a photovoltaic thermal (PV/T) hybrid solar collector is presented. The studied system is constituted by a sheet and tube placed below the surface on which the solar cells are assembled to extract heat from the photovoltaic module. The mathematical model is based on the equations of the energy balances written for the various nodes of the system, and the coupled differential equations obtained are solved by using the finite differences method. The temperatures of the various layers of solar PV/T collector and the coolant temperature are predicted. With the hybrid solar collector presented in this article, the temperature at the maximum photovoltaic cell is reached 53 °C; we see that the integration of the heat exchanger at the photovoltaic collector reduces the temperature of the PV cell that which increases its efficiency, in the other hand, the gain of these calories is used for heating the fluid. We obtained an overall efficiency which is the sum of the electrical efficiency and thermal efficiency for irradiation conditions chosen equal to 64%. The results of experimental study were compared with theoretical data and the model was validated.
Energy and Buildings, 2013
ABSTRACT Hybrid photovoltaic thermal (or simply PV/T) collectors are devices that simultaneously ... more ABSTRACT Hybrid photovoltaic thermal (or simply PV/T) collectors are devices that simultaneously convert solar energy into electricity and heat. The improving of the electrical efficiency, by reducing the photovoltaic collector's temperature, as well as taking advantage of the thermal energy produced, constitutes the basic idea in the development of hybrid PV/T collectors. A new design of hybrid collectors for air heating is presented in this paper. The theoretical study is carried out through the numerical modeling, and the results of the simulation are integrally developed; witch a prototype is realized. Experimental validation of the mathematical model as well as the study of the thermal and electric performance is detailed. The application of this new design has given a good thermal and electric performance compared to the traditional hybrid collectors. Its simplicity of implementation and its easy integration in buildings make them more competitive.
Résumé Afin de maximiser la production d’électricité d’une installation photovoltaïque, il convie... more Résumé Afin de maximiser la production d’électricité d’une installation photovoltaïque, il convient d’orienter les modules de façon optimale afin de capter un maximum du rayonnement solaire. En effet, la direction du soleil est importante. L’objectif de ce travail consiste à évaluer l’intérêt énergétique (le gain) de la correction d’angle d’inclinaison des modules photovoltaïques orientés plein sud dans un système énergétique hybride photovoltaïque / groupe électrogène.
Applied Thermal Engineering