@article {1874, title = { Building incorporated bio-based materials: Experimental and numerical study }, journal = { JOURNAL OF BUILDING ENGINEERING }, volume = {28}, year = {2020}, abstract = {

In building environments, several research on dynamic moisture storage in hygroscopic building materials has improved interest in moisture buffering capacity of bio-based materials and demonstrated the potential of these materials to improve thermal comfort and buildings energy consumption. This paper presents an investigation, which aims to compare the hygroscopic behavior of different bio-based materials to identify their hygric proprieties. For this, an experimental facility is used to measure the moisture buffer value (MBV) for different categories of building materials. Thereafter, a dynamic simulation has been carried out by using TRNSYS software in order to evaluate heating and cooling loads. The results showed that the wood-cement composite still has excellent moisture regulator when compared to wood panels or fibrous materials. It has a buffer capacity superior to 3 [g/m(2).\% RH] very close to that of wood fiber panels. The simulation results of the different cases showed that the insulation reduces significantly total energy demand, but it does not lead heat evacuation in the summer season. Thus, from this study, it can be concluded that a natural ventilation mechanism is recommended to improve energy efficiency in the building.

}, author = {F. MNASRI and S. BAHRIA and M.E.A. SLIMANI and O. LAHOUCINE and M. EL-GANAOUI} } @article {1697, title = { Wind effect on full-scale design of heliostat with torque tube }, journal = { MECHANICS \& INDUSTRY }, volume = {18}, year = {2017}, abstract = {

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.

}, author = {M. MAMMAR and S. DJOUIMAA and A. HAMIDAT and S. BAHRIA and M. EL-GANAOUI} } @article {1602, title = { Parametric study of solar heating and cooling systems in different climates of Algeria - A comparison between conventional and high-energy-performance buildings }, journal = {ENERGY}, volume = {113}, year = {2016}, pages = {521-535}, abstract = {

Parametric optimization using dynamic simulation of a solar thermal system for producing hot water, space heating and cooling was developed. The system layouts include a single-effect absorption chiller activated by heat generated by flat plate solar collectors and stored in a solar storage tank. Two construction types were compared; the first is the typical construction in Algeria (low thermal mass with U-values of 1.25 W/m(2)K, single glazing), which represents the majority in the country, while the second is a High-Energy-Performance building (with U-values of 0.35 W/m(2)K, double glazing), representing the pilot project called ECO-BAT. Three of Algeria\&$\#$39;s regions were considered to evaluate the climatic effect of solar systems integration. Algiers represents the coastal region; Djelfa, the highlands region; Tamanrasset, the Sahara region. In parametric study, two solar collectors\&$\#$39; field parameters were analysed, including the surface area and the tilt angle. The results indicated that building loads are significantly reduced (12\%, 44\% and 22\% for Algiers, Djelfa and Tamanrasset, respectively). The solar energy contribution is more than 60\% for all cases, a significant contribution for an efficient building. In all cases, we observed that the solar fraction reaches more than 45\% when the optimum parameters of the solar system are selected.

}, author = {S. BAHRIA and M. AMIRAT and A. HAMIDAT and M. EL-GANAOUI and M.E. SLIMANI} }