http://depot.umc.edu.dz/handle/123456789/6265 Sun, 31 May 2026 14:15:55 GMT 2026-05-31T14:15:55Z http://depot.umc.edu.dz/handle/123456789/14748 Contribution à l`étude d’une machine frigorifique à éjection avec l’utilisation d’un micro-échangeur lors de l’évaporation et de la condensation, conception du système et modélisation. Derghout, Zoheir; Gomri, Rabah This thesis is a study of a vapor ejection refrigerating machine. The study consists in developing a program allowing the sizing of the ejector taking into account the characteristic data of the three heat sources (the evaporator, the condenser and the boiler). The results obtained are validated by experimental work carried out as part of the “VERPUR” research project (between CanmetENERGY and Hydro-Québec, Canada). Then, we developed a calculation program in simulation mode to know the limits of this refrigeration cycle and define the characteristics of each point in the ejector for a specific geometry. A study of the influence of the temperatures of the three energy sources on the overall efficiency of the ejector cycle after seeing the influence of the type of solar collector on this efficiency is also carried out. Mon, 08 May 2023 00:00:00 GMT http://depot.umc.edu.dz/handle/123456789/14748 2023-05-08T00:00:00Z http://depot.umc.edu.dz/handle/123456789/14482 Utilisation des énergies renouvelables pour la production de l’hydrogène. Ameur Menad, Chawki; Gomri, Rabah The following thesis consists of a deep research about using renewable energy resources for hydrogen production under Algerian climate on one side, and in different climatic conditions on the other side. The obtained results proofed that there are many pathways for hydrogen production even from the same renewable energy resource. In fact; solar energy is considered the dominant resources where the process of hydrogen production could happen through different technics such as parabolic trough collector systems, and PV technology. Improving the amount of hydrogen produced through the combination of nanotechnology, and micro-technology, with the energy systems has been taken on consideration. In addition; other renewable energy resources like geothermal energy, wind energy, and biomass energy. Sun, 26 Jun 2022 00:00:00 GMT http://depot.umc.edu.dz/handle/123456789/14482 2022-06-26T00:00:00Z http://depot.umc.edu.dz/handle/123456789/13646 Contribution à l’amélioration des procédés de séchage contribution à l’amélioration des procédés de séchage. Amouiri, Raouf; Belhamri, Azeddine Recently the influence of the huge increase in energy cost has had an impact on the Manufacturing or transformation process where drying is implemented. Herbal and medicinal plants dehydration is among these applications. Medicinal plants are a massive holder of multiple active components, and essential oils, which are principally used in pharmaceutical production, perfumery... etc. In the present study, experiments besides a simulation have been carried out for analysing well the Myrtus Communis leaves dehydration procedure. Drying kinetics for the Myrtus Communis leaves has been pointed out in an indirect solar dryer in Constantine area, (Algeria), and sorption isotherms experiments have been defined in a laboratory using the static gravimetric method. These valuable experimental data have been used in the numerical simulation in order to proximate the modelling to the real phenomena. Numerical simulation has been carried out using the finite element method by the use of the closed source package Comsol Multiphysics. Predict airflow distribution inside a solar dryer helps in avoiding microbial growth and contamination, as well as optimizing dryers design. Thu, 29 Sep 2022 00:00:00 GMT http://depot.umc.edu.dz/handle/123456789/13646 2022-09-29T00:00:00Z http://depot.umc.edu.dz/handle/123456789/13219 Modélisation et expérimentation d’une installation frigorifique à éjection Gaz-Gaz. Bencharif, Mehdi; Zid, Said; Nesreddine, Hakim The main objective of this research project is to study the effect of droplet injection at the outlet of the ejector in an ejector refrigeration system destined for air conditioning and refrigeration, to see the potential effects of drops on the performance parameters of the ejector-based refrigeration cycle. To this end, a numerical and experimental approach is put in place and has been separated into two parts to study the phenomenon. The experimental part is carried out in the Hydro-Québec Shawinigan Canada research laboratory with over a hundred tests developed on a prototype with a nominal cooling capacity of 35 kW. Using the refrigerant R245fa as a working fluid. The tests were realized by varying the following parameters: the flow rate of the primary fluid (ranging from 0.33 to 0.43 kg / s) as well as the temperatures of the heat transfer fluids at the inlet of the generator (81 to 85 °C) and the evaporator (13 to 15 °C) and coolant at the condenser inlet (20 to 28 °C). Statistical analysis is developed for a better evaluation of the experimental results. In the numerical part, several thermodynamic models are developed for each cycle component under Matlab R2017b software, with a particular emphasis on the one-dimensional thermodynamic model of the ejector based on the energy,mass, and momentum conservation equations. The ℇ-NUT method is used for each 'one of the models of the heat exchangers (generator, condenser, and evaporator). The device of the injection of drops at the exit of the ejector, the numerical results are validated thereafter with the experimental data made in the LTE laboratory of Hydro-Quebec. Shawinigan. Canada. The obtained results are very interesting for understanding the complex phenomena that have occurred within the ejector. With a good match between the numerical and experimental results. With an improvement in the coefficient of performance. Wed, 19 Jan 2022 00:00:00 GMT http://depot.umc.edu.dz/handle/123456789/13219 2022-01-19T00:00:00Z