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Water Production by Condensation of Wet Air

Modern Mechanical Engineering 2020年第2期10卷 17-24页

作者： louis okotaka ebale Guy Dieudonne Moukandi N’kaya Wilfrid Kombo Feldha Kibongani Laboratoire de Mécanique Energétique et Ingénierie Ecole Nationale Supérieure Polytechnique Université Marien Ngouabi Brazzaville Congo

It is now assumed that climate warming is effective and noticeable. It not only leads to a lack of water that is increasing in desert areas, but it must be kept in mind that the inhabitants of the villages located in the geographical areas whose access to water is difficult, make binding efforts to gain access to water. This article proposes to present the possibility of obtaining water by the condensation of the water vapors of the air by applying the thermodynamic processes of the humid air as well as those of the refrigerating installations. In fact, atmospheric air contains suspended water vapors. When this steam cools below its rose point, there is condensation if water vapors and liquid water or ice appears. It was obtained a quantity of condensed vapors in a refrigeration facility. This amount is directly proportional to the refrigeration power whose efficiency can be improved by the use of photovoltaic energy given the reduced financial cost of this energy. This seems to be a hope among the possible solutions to be considered for the resolution of the water issue.

关键词： Refrigeration Installation Satured Wet Air Condensed Vapors Dew Temperature

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Exergetic Analysis of a Refrigeration System with Mechanical Vapors Compression

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Energy and Power Engineering 2020年第8期12卷 490-498页

作者： louis okotaka ebale Aristide H. W. Nakavoua Landry Jean Pierre Gomat Laboratory of Mechanics Energetics and Engineering Unesco Chair in Engineering Sciences Ecole Nationale Supérieure Polytechnique Marien Ngouabi University Brazzaville Congo Laboratory of Chemistry of Natural Substances (IRSEN) Brazzaville Congo

The main purpose of this study is to improve the energy efficiency of a refrigerated facility by means of exergetic analysis. In order to achieve this goal, we have evaluated the input exergy flows of the whole system to deduce the exergetic yields, which are compared to the degree of irreversibility in order to have a qualitative measurement of energy losses. The concept of exergy is the part of energy that is virtually converted into work. The exergetic analysis was performed on a refrigeration unit ZR22K3E Copeland Scroll. The results of this analysis are consistent with the condition, that the exergetic performance, which is: 36.57% and it is approximately equal to the degree of irreversibility which is 37.50%. This approach provides a comprehensive, standard and rigorous framework for the analysis of energy systems, and thus for the understanding and systemic management of the energy challenge.

关键词： Exergy Exergetic Balance Exergetic Performance

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Attempt to Polymerize <i>Cucurbita pepo</i>Oil by Temperature Action and Photolysis

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Open Journal of Applied Sciences 2021年第3期11卷 264-272页

作者： Aristide H. W. Nakavoua louis okotaka ebale Bertin Mikolo Vincent Verney Gilles Figuérédo Laboratory of Chemistry of Natural Substances (IRSEN) Brazzaville Congo Laboratory of Mechanics Energetics and Engineering Unesco Chair in Engineering Sciences Ecole Nationale Supérieure Polytechnique Marien Ngouabi University Brazzaville Congo Marien Ngouabi University National Polytechnic High School (ENSP) Laboratory for the Valorisation of Agri-Resources Brazzaville Congo Institute of Chemistry of Clermont-Ferrand (ICCF) UMR 6296 Team Design of Polymers and Macromolecules Scientist Set Cézeaux24 Avenue des Landais Clermont Ferrand France LEXVA Analytical 460 rue du Montant 63540 Romagnat France or Henri Mondor Street Biopole Clermont-Limagne 63360 Saint Beauzire Clermont Ferrand France

The study of the polymerization of a vegetable oil has a double interest;industrial but especially food. Industrial because polymers based on vegetable oil are in line with sustainable development;food because an oil which polymerizes easily is a danger for human consumption. Three situations of Cucurbita pepo oil polymerization are carried out in the course of time, the factor retained being temperature. A monitoring of the evolution of the enthalpy by temperature variation by the DSC method allows to report the polymerization of this oil. It happens that a polymerization is triggered in the oil matrix but it seems to fade very quickly, this behavior is general because after sweeping a temperature range of 80°C;100°C and 150°C adding different amounts of Irgacure: the Cucurbita pepo oil resists polymerization through its antioxidant compounds. However, a photolysis of this oil carried out over 8 days shows that it effectively polymerizes after 144 hours, which proves the great capacity of antioxidant compounds to protect this oil. The analyses carried out at 25°C aim to simulate the behavior of the oil at room temperature. The results reveal good resistance to both thermochemical and photochemical polymerization, which opens up great prospects for its development in the food industry and in nutrition.

关键词： Cucurbitea pepo DSC Polymerization Antioxidants Irgacure and Photolysis

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Stratigraphic Data and Groundwater Resources in the Coastal Sedimentary Basin of the Pointe-Noire Region (Republic of Congo)

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Journal of Water Resource and Protection 2020年第12期12卷 1019-1033页

作者： Guy Dieudonne Moukandi N’Kaya louis okotaka ebale Christian Tathy Jean De Dieu Nzila Jean Luc Mouthou Bernard Mabiala LMEI/CUSI/Ecole Nationale Supérieure Polytechnique Marien Ngouabi University Brazzaville Congo LARGEN/Ecole Normale Supérieure Marien Ngouabi University Brazzaville Congo Faculté des Lettres et des Sciences Humaines Département de Géographie Université Marien Ngouabi Brazzaville Congo

The synthesis of geological and petroleum research undertaken in the coastal Sedimentary Basin of the Pointe-Noire region enabled the establishment of a lithostratigraphic scale. It has been observed that the order in which the series observed in outcrop and those encountered by deep wells succeed each other has allowed a value to be given to this relative scale. The study area corresponds to a longitudinal tectonic accident, fault or flexure. It belongs to the Cretaceous and Tertiary coastal sedimentary basin covered by the Plio-Pleistocene age formations (series of circuses), formed of highly permeable sands comprising multiple resistant horizons that store large bodies of water whose reserves are considered very important. Hydrographic network is composed of four main basins with a mediocre size. The quality of this groundwater is considered to be satisfactory for household consumption, but the sustainable management of these reserves requires constant checks on their quality as well as on the level of the reserves. All these resources put the agglomeration of Pointe-Noire close to large exploitable water reserves that meet the need for drinking water, even if, on the whole, the agglomeration is still experiencing many difficulties in terms of its drinking water supply.

关键词： Geological Stratigraphic Scale Groundwater Resources Coastal Aquifers Sedimentary Basin Pointe-Noire

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