List of symbolsT Temperature [°C] P Pressure [Pa] ρ Density [kg/m 3 ] ma Adsorbed mass [kg/kg] ω 0 Maximal couple adsorbable [m 3 /kg] D, n Characteristic parameters torque adsorbent/ adsorbate (refrigerant) ΔH Enthalpy variation [J/kg k] L Latent heat of evaporation [J/kg] R Constant de la thermodynamics Q Heat energy [J] C p Specific heat [J/kg k] COP Coefficient of performance M s Adsorpt if mass couple [kg] h Enthalpy [J/kg•k], hot s Entropy [J/kg k] m Mass flow [kg/s] Ex Exergy [kw] Ψ Exergy content [kJ/kg] η Rendement exergétique n Constant solid/steam i Inlet o Outelet m Medium Subscripts and abbreviations EAHT Ejector adsorption heat transformer AHT Adsorption heat transformer Abstract The work presented in this paper is an analysis of an energetic and exergetic geothermal energy-assisted adsorption heat transformer. The zeolite 13X-H 2 O couple is used to recover energy and minimize irreversibility effects. A comparison of the obtained results for a simple adsorption heat transformer with ejector is carried out. It is observed that the ejection system shows a lower total of irreversibility than the simple system. The simulation results show that the exergetic performance and efficiency of a cycle of an adsorption heat transformer with ejector are important. It is 12 and 10 %,
The demand for energy is growing rapidly due to the industrial and socioeconomic development experienced by many emerging countries including Algeria. Therefore, the use of renewable energy is a good alternative to fossil fuels. Renewable energies are very economical, permanently available and are environmentally friendly. This work concerns the study and numerical simulation analysis of a solar-geothermal adsorption heat transformer (AHT) using zeolite 13X/H2O as a couple adsorptive (adsorbent/adsorbate). The findings were presented and interpreted over two periods respectively for summer (July 15th) and winter (December 15th). A numerical simulation was carried out on TRNSYS which made it possible to analyze the influence of the parameters on the system, namely, the surface of the solar collector, the depth, the climate in Algerian cities (Sidi Bel Abbè s, Algiers, Adrar), and soil conductivity (clay, sand and limestone) on the outlet temperature of the geo-solar system. Moreover, a second calculation code has been developed using energy and mass conservation equations as well as the Dubinin-Astakhov equation of state which considers the influence of various parameters on the (AHT) system such as the GEO-SOLAR system outlet temperature, the generation, adsorption and evaporation temperatures. The results showed that the solar collector surface type, the test period, the depth and nature of the soil have significant effects on the thermal behavior of the geo-solar combined system. The performance of the AHT system is proportional to the outlet and adsorption temperatures. Moreover, the COP_AHT ranged from 0.40 to 0.48 and from 0.30 to 0.38 for the COP_sys, unlike the evaporation temperature.
The objective of this work lies in the three-dimensional study of the thermo mechanical behavior of a blade of a centrifugal compressor. Numerical modeling is performed on the computational code "ABAQUS" based on the finite element method. The aim is to study the impact of the change of types of blades, which are defined as a function of wheel output angle β2, on the stress fields and displacements coupled with the variation of the temperature.This coupling defines in a realistic way the thermo mechanical behavior of the blade where one can note the important concentrations of stresses and displacements in the different zones of its complex form as well as the effects at the edges. It will then be possible to prevent damage and cracks in the blades of the centrifugal compressor leading to its failure which can be caused by the thermal or mechanical fatigue of the material with which the wheel is manufactured.
This paper presents a comparative based analysis on the mechanical behavior of three different forms of volute of volute of a centrifugal pump with a spline, a radial and a tangential type using ABAQUS Software calculation code. The result of the analysis shows that the stress concentration is localized at the volute nozzle for all the three types of forms. This founding is an interesting element as regards to the possibilities of adaptation of a pump to a particular operation. Also it is found that the tangential volute is the least stressed compared to the other two forms. The displacements are more pronounced in the case of a radial volute. These data can be exploited in order to predict the possibility of accidental rupture of this element. From another point of view this can have an indirect influence on the appearance of vibration, noise and fluctuations of pressures and speeds due to the interaction between the fixed part (volute) and the mobile part (impeller).
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