Mohamed HAMDI

• Ph.D. in Energy Engineering
• Assistant Professor at Higher Institute of Applied Science and Technology of Sousse

Green ammonia is a cleaner alternative of traditional processes that are energy-intensive and relies on fossil fuels. However, effectively integrating elements such as the photovoltaic system, the electrolyzer, and the ammonia reactor is a challenge that significantly impacts the production cost. The consistent operation of the electrolyzer and amm...

The environment, energy, and water are the three essential pillars of sustainable development. In light of the freshwater scarcity faced by numerous countries, desalination emerges as a practical solution. As a result, countries are increasingly establishing desalination facilities along their coastlines. However, these initiatives are energy-inten...

A type of solar collector design known as an Integral Collector Storage (ICS) System combines the collector and storage components into a single device. Because of their low cost, these batch solar water heaters have proven to be effective in producing Domestic Hot Water (DHW). In this study, both Dynamic System Testing (DST) and Q-H procedures wer...

The main objective of this study is to design and optimize an innovative concrete based dual-purpose solar collector with working fluids of air and water. The system is designed, built, and tested in the Tunisian climate, and its main feature is that it warms both air and water. Different configurations have been tested and analyzed based on the ai...

The main limitation of Integrated Collector Storage systems lies in their low efficiencies and high loss coefficients. In this paper, experimental and numerical setups are conducted to assess the thermal performances of low cost Cylindrical Parabolic Integrated Collector storage (CP-ICS). The conceived system has two aluminum plates in parabolic fo...

The aim of this research is to assess the thermal performance of a locally developed two-phase closed thermosyphon system charged with methanol. The performance of the system is examined through experiments to determine the impact of changes in the electrical heat power, liquid charge, flow rate, inclination angle, and cooling water temperature on...

This work analyzes the performance of a new Integrated Collector Storage Solar Water Heater (ICSSWH) by using Dynamic System Testing (DST) method according to Standard ISO 9459‐5. The long‐term performance study of the system in different climatic conditions has been achieved by a coupling model between DST results and a numerical approach based on...

Water scarcity affects about one billion people in the world. Around two billion people could be living in water-stressed areas by 2050. For this reason, the desalination is always evolving due to the importance of the water resources found in the seas and brackish water. As these systems are generally energy intensive, the use of a renewable energ...

Opuntia Ficus Indica (OFI) cladodes slow pyrolysis was conducted in a fixed-bed reactor at various temperature (500–600–700 °C) and residence time (30–60–120 min) with a constant heating rate (10 °C min−1). The highest biochar yield (40.08%) was obtained at 500°C and 30 min whereas more liquid (35.03%) and gaseous (31.08%) products were produced at...

This work aims to quantify the long-term performance improvement of solar water heater system by using both simple and hybrid nanofluids. For this purpose, transient system simulations of a flat plate solar collector have been carried out and discussed using titanium oxide, magnesium oxide, and copper oxide/multiwalled oxide–carbon nanotube nanoflu...

This study aims to quantify how much the uncovered photovoltaic/thermal (PV/T) system is able to assist a small reverse osmosis (RO) desalination unit with a capacity of 1 m³/h of purified water and high salinity seawater (45,000 ppm). For that purpose, a computational tool has been developed, validated, and executed with real meteorological data o...

Bringing together nanofluids and solar collectors has been widely discussed without any major advance or long-term study being carried out. In this context, this paper provides a useful feasibility study to help future decisions in using nanofluids in Solar Water Heating Systems (SWHSs) in different locations. The performances of SWHSs using the na...

In this work, performances of a system that uses a solar collector to generate domestic hot water (DHW) in the Tunisian climate were analyzed using a dynamic approach based on TRNSYS modeling. This dynamic approach enabled us to evaluate system performances on a daily and monthly basis and to determine the energy collected by the solar panels and t...

This paper aims to quantify sensitivities of energy and exergy performances of Flat Plate Solar Water Heaters (FPSWHs) with respect to measurement parameters. For that purpose, a computational tool is developed and validated by using outdoor conditions according to the test standard EN 12975. First of all, numerical simulations are compared with ex...

This paper deals with both energetic and economic studies of a new integrated collector storage with honeycomb transparent insulation (ICSHTI) which was conceived, developed, and tested in the Research and Technology Centre of Energy (CRTEn), Tunisia. Experimental and numerical studies were performed in order to evaluate the thermal and the economi...

This paper deals with the energy performance of a new integrated solar storage collector (ISSC) with compound parabolic concentrator (CPC) conceived in the Thermal Process Laboratory in CRTEn Borj Cedria (North of Tunisia). The novelty in this system is the use of transparent vacuum insulation in the annulus between double half‐Cylindrical Plexigla...

The recently developed link-wise artificial compressibility method (LW-ACM) with double population is presented, validated and then applied to magneto-convective flow. The validation step evolves in two stages. First of all, we used the problem of mixed convection over a vertical duct preceded by a sudden expansion in order to validate the multiple...

The performance of the recently developed Link-Wise Artificial Compressibility Method (LW-ACM) is evaluated for aerodynamic applications and then applied for both attached and separated flows. Numerical flow simulations are performed around NACA-0012 and TSAGI-12 shaped airfoils at low speed and high angle of attack. Results of aerodynamic characte...

Lattice Boltzmann method (LBM) with revised matrix RM-D3Q19 coupled with multiple relaxation time MRT-D3Q7 model is proposed for the first time to study the effect of external magnetic fields on heat transfer in a cubical cavity subjected to horizontal temperature difference. Heat transfer and flow patterns are predicted for fluid with low Prandtl...

In Tunisia, domestic production of organic waste is estimated at 30 million tons per year of which over 1.5 million tons of household waste. This enormous potential can be used efficiently to product electric power. In this context, we investigate numerically the combustion of biogas derived from anaerobic digestion of waste (CH4, CO2, and N2) in a...

Lattice Boltzmann Method (LBM) with Revised Matrix RM-D3Q19 coupled with Multiple Relaxation Time MRT-D3Q7 model is proposed for the first time to study the effect of external magnetic fields on heat transfer in a cubical cavity subjected to horizontal temperature difference. Heat transfer and flow patterns are predicted for fluid with low Prandtl...

In this paper, a Lattice Boltzmann solver is developed and applied to heat convection in a thin layer of fluid with very high Prandtl number. Thermophysical properties of the fluid are chosen exhibited by the majority of oils. The numerical validity of the code is tested against known natural convection flow solutions and a visual representation of...

It is of interest to discuss the analogies between ELB and LBM with turbulence models. This paper addresses the issue of incorporation of the subgrid turbulence model in the lattice Boltzmann equation (LBE). A lattice Boltzmann solver is implemented using various techniques, and the performance will be discussed. The numerical validity of the codes...

A Lattice Boltzmann solver is implemented using various techniques and the performance is discussed. Both Open Multi-Processing (OpenMP) and Message Passing Interface (MPI) parallelization techniques using the same numerical algorithm and employing different collision terms were executed. We compare the numerical solution of different programming p...

A numerical investigation of laminar mixed convection flow through a water-alumina nanofluid in a microscale vertical duct preceded with a double-step expansion has been executed. The governing equations are solved by using Lattice Boltzmann equation (LBE) with multiple-relaxation-time (MRT) collision model. The thermal conductivity and effective v...

Une méthode numérique basée sur l’équation de Boltzmann (LBE) à deux distributions est développée pour résoudre les équations de conservation (énergie et quantité de mouvement) et caractériser l’instabilité de Rayleigh Bénard en cas de convection naturelle. La configuration considérée est un canal chauffé par le bas, refroidi par le haut et travers...

The focus of this work is to study the ability of unsteady RANS-based CFD to predict the dynamical behavior of the flow past a circular cylinder and a cubic obstacle for a wide range of Reynolds numbers. Incompressible laminar and turbulent flow past a circular cylinder is computationally investigated by a cascade of turbulence modeling strategies....

This work is a part of a project aiming to solve turbulent flows encountered in aerodynamic applications . The major part of the work discusses the flow behavior around bluff bodies ranging from a simple circular cylinder to the three dimensional bluff body. To validate the overall numerical simulations, we compare our results to many recent and ex...