Mohammed Amine Moussaoui

Lattice Boltzmann simulation of surface radiation and natural convection in a square cavity with an inner cylinder

A numerical study is carried out for conjugate natural convection–surface radiation heat transfer from a heated circular cylinder enclosed in a square cavity. A hybrid scheme with lattice Boltzmann for fluid velocity variables and finite difference for the temperature is used. The vertical walls of the enclosure are cooled with a uniform temperature while the others are adiabatic. Effects of the Rayleigh number, size and location of the heated cylinder and surface emissivities are investigated numerically. The results are reported in terms of isotherms, streamlines and the average Nusselt number. It is found that (i) the radiation exchange standardizes the temperature inside the cavity and produces an increase in the heat transfer, particularly at large Ra, (ii) the heat transfer enhances with increasing cylinder size and/or surface emissivity and (iii) the maximum rate of heat transfer occurs when the cylinder is located at the horizontal median close to the vertical wall.

Lattice Boltzmann Simulation of Convective Heat Transfer from Heated Blocks in a Horizontal Channel

This article presents the application of the multiple-relaxation-time (MRT) lattice Boltzmann equation (LBE) method with nine-velocity model to the numerical prediction of a laminar and convective-heated transfer through a two-dimensional obstructed channel flow. The obstruction is carried out by three obstacles including two located on the upper wall and the other on the lower wall of the channel. The calculations are validated against results available in literature. Various physical arrangements are regarded as the size of the obstacles and the distance between the two upper obstacles to investigate their effects on thermal and flow characteristics. Results, presented for a Prandtl number equal to 0.71 and a Reynolds number ranging from 100 to 1200, showed that the heat transfer and the air flow depend both on the Reynolds number and geometric data of the configuration.

Improving the energy-efficient envelope design for Moroccan houses

The building sector accounts for about 36% of final energy consumption in Morocco, with 29% reserved for residential and 7% for the tertiary sector. This energy consumption is expected to increase in view of major projects initiated and planned by the government in key sectors of the Moroccan economy. Thus, this article presents a dynamic energetic study for an individual house building located in Oujda city (Morocco) by using TRNSYS software. A typical meteorological year (TMY) corresponding to Oujda city was established and used to determine the required energy for obtaining the thermal comfort in winter and summer conditions. Special attention was paid to the effect of different parameters, such as insulation and thermal mass, colour of external surfaces, window type and area and shading on the annual required energy. Results show that annual heating required energy is reduced by 8.38% and the annual cooling required energy is reduced by 70.54% by using 6 cm of EPS thermal insulation to the outside of exterior walls. The window area plays an important role in building energy consumption in the Moroccan environment. A saving of 1.91% in annual required heating energy and 6% in annual cooling required energy for the base case house can be achieved by replacing the single glazing by double glazing.

Computation of heat transfer and fluid flow in an obstructed channel using lattice Boltzmann method

Purpose – The purpose of this paper is to investigate the laminar flow and heat transfer characteristics in a two‐dimensional horizontal channel with two square blocks placed side‐by‐side using a numerical scheme based on a coupling between the lattice Boltzmann method and the finite difference method.Design/methodology/approach – The multiple‐relaxation‐time (MRT) lattice Boltzmann equation model coupled with the finite difference method are used to predict numerically the velocity and the temperature fields.Findings – A complex structure of the fluid flow was observed for various dimensionless block separation distance (G). An unsteady flow was found when the two blocks are placed side by side (G = 0). For G   1.5), the effect of this parameter (G) on the fluid is reduced, whereas, the distance between the blocks and the nearest walls have a great influence on the flu...

Performance of parabolic through solar power plant under weather conditions of the Oujda city in Morocco

A numerical simulation of Concentrating Solar Power (CSP) plant based on an Organic Rankine Cycle (ORC) power generation unit integrated with parabolic trough collectors is carried out. For the study we refer to the Solar Electric Generating System VI (SEGS VI), installed in the Mojave desert-California (USA), whose solar field which is constituted by LS2 parabolic trough collectors and we consider the same plant implementation in the region of Oujda city (Morocco). To predict the energy performance, the simulations are carried out using TRNSYS 16 simulation program known for its modularity and flexibility and the external library known as the Solar Thermal Electric Components (STEC) library. The meteorological parameters including Direct Normal Irradiation (DNI), ambient temperature and other weather conditions are taken from meteorological year database provided by a high precision MHP station located in Mohamed Premier University. The obtained results show that the region of East offers great potential in general for implementing this type of plant. In fact, the value of 30 MWe is reached during the strongest sunshine day and the operating time can go from 7 AM until 19 PM for a summer day.