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This work is devoted to the study of a thermoacoustic Swift-Backhaus engine, composed of a porous medium regenerator and a resonator consisting of an annular loop and of a linear portion. This machine has finally attracted the attention of researchers to create industrial applications of renewable energies. This last stage can only be done after an improvement and an optimization of certain components...
In this study, we have devised a numerical 2D model (plane symmetry) of a linear thermoacoustic machine composed of two heat exchangers, stack and a resonator. It solves the coupled compressible Navier-Stokes and heat transfer equations using COMSOL Multiphysics software, using an ideal gas model for air, and P2-P1 finite elements. Implicit Large Eddy Simulation (iLES) has been used to simulate the...
The acoustic streaming is a time-averaged flow that can generate in the thermoacoustic devices. The origin of the slow phenomena is the interaction between the acoustic oscillation in the fluid and thermal and mechanical conditions on the solid walls. This mean flow leads to mean convective heat transport that can have a large impact on the performance of thermoacoustic devices. This paper reports...
A study of the laminar free convection in a cubic cavity 3D partially porous media is conducted numerically. The Brinkman-Darcy model with the Boussinesq approximation is used to characterize the flow field inside the porous region, while the local thermal non-equilibrium (LTNE) model are employed for energy equations. A numerical methodology based on the finite volume method and a full multigrid...
A thermal model regarding a photovoltaic module has been developed and validated using experimental data. The aim of this study was to recovering heat wasted by Joule effect by adding the heat exchanger rear sensor and an additional window forward. We will also compare the thermal and electric performance a hybrid sensor covered with an additional pane with another uncovered in the aim of improving...
This paper presents a generic thermal model of electric appliances as an auxiliary heat source in low energy consumption buildings. The electric appliances are firstly classified into four categories by their heat and mass transfers. The mathematical model and its electric equivalent circuit are proposed based on the first law of thermodynamics and the thermal-electric analogy. Then the correspondence...
In order to reduce heat energy demand in residential building, thermal insulation and indoor air tightness become more important. However, in a well-insulated environment, internal heat gain caused by solar radiation, metabolism and losses of home electric appliance (i.e. refrigerator, lamp, television, etc.) can be dominant to home global energy management. To quantify and to modelize the heat gain...
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