Performances d’Energie Electrique d’une Habitation à Energie Positive en Milieu Suburbain en Algérie

L’énergie solaire photovoltaïque produite au niveau d’une habitation à énergie positive peut renforcer l’énergie électrique du réseau de distribution, spécialement dans les régions suburbaines qui possèdent un gisement solaire suffisant. L’énergie produite apporte une solution aux problèmes des chutes de tension surtout durant les périodes de grande demande d’énergie. Ce papier présente une étude du cas d’une habitation résidentielle productrice d’énergie de source solaire en milieu suburbain en Algérie. Cette étude consiste à simuler les performances énergétiques électriques en se basant sur les données réelles de consommation électrique d’une habitation située au Sud-Est de la Wilaya de Bouira. Les calculs sont effectués à l’aide du logiciel Homer, version 2.68 beta. Le bilan énergétique électrique annuel de l’habitation montre que 63% de l’énergie consommée est assurée par le photovoltaïque et seulement 37% est soutiré du réseau électrique

A numerical Resolution of The Current-voltage Equation for a Real Photovoltaic Cell

AbstractSolving the characteristic equation of the real photovoltaic cell that contains two variables is to find for each value of the voltage of the cell the value of the electric current generated by this cell. Since the complex shape of this equation does not permit to resolve it analytically despite that we know the intervals of solutions, the interval of solutions of the electric current varies from the value 0 to the value Isc (the short-circuit current). The interval of solutions of the voltage varies from the value 0 to the value Voc (the open circuit voltage), from the advantage of knowing the intervals of solutions, we can solve this equation with a numerical model

Modelling photovoltaic water pumping systems and evaluation of their CO2 emissions mitigation potential

In photovoltaic (PV) water pumping design, the accurate prediction of the water flow is a key step for optimized implementation and system robustness. This paper presents a model to characterize the motor-pumps subsystems used in PV pumping installations. The model expresses the water flow output (Q) directly as a function of the electrical power input (P) to the motor-pump, for different total heads. The actual model is developed using the experimental results obtained by the use of several motor-pump subsystems of different types and technologies. This work details the investigations concerning centrifugal and positive displacement motor-pump subsystems. The experimental tests are used to validate the developed model. Based on the motor-pump subsystem model, a method is proposed to estimate the amount of carbon dioxide (CO2) emissions saved by the use of water pumping facilities powered by a photovoltaic array instead of diesel fuelled generators. This work shows that the dissemination of PV water systems not only improves the living conditions in remote areas, but is also environment friendly.Photovoltaic Water Pumping systems CO2 emissions Diesel Climate

Wind effect on full-scale design of heliostat with torque tube

Despite the importance of designing support structures for solar collectors, very little reliable work has been done to investigate the forces of the wind on heliostats of solar tower at real scale. Wind loads on heliostats are usually determined at low-speed wind tunnels scale, where the design full-scale Reynolds number cannot be reached. In the present study, measured data are used to validate the simulations at wind tunnel scale. Thereafter, by using the same method, three-dimensional numerical simulations of turbulent wind flow around a big heliostat of solar tower are performed. The obtained numerical results are presented for several elevation angles at normal operation and stow position. The results revealed that the known stow position (when the backside of the heliostat is facing the ground) is not the optimum position (other optimum elevation angles are discovered) especially with high wind speed, and the effect of torque tube is significant on heliostat mean wind loads