Browsing by Author "Zaatri, A."

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    A Field Study Of Indicators Of The Performance Of Four Absorption Chillers In The Sudano-sahelian Region Of Cameroon
    (University of Eloued جامعة الوادي, 2016-01-01) Chedop, A.n.n.; Djongyang, N.; Tchinda, R.; Zaatri, A.; Kana, J.d.
    This paper presents a field study of indicators of the performance of absorption refrigerating systems in the Sudano-Sahelian region of Cameroon. A modeling of various components of the system is performed in order to choose the technology best adapted for the region. Based on the characteristics from the manufacturers, four absorption chillers were studied; namely: EAW Schüco LB 15 and 30; Rotartica Solar 045 and Sonnenklima Suninverse. The model of Kühn and Ziegler and meteorological data of the city of Maroua ((14.33 °E, 10.58 °N) were used to assess the coefficient of the performance (COP) of these machines. Results showed that the Sonnenklima Suninverse technology is best suited for the climatic conditions of the Sudano-Sahelian region with COP values between 1.5 and 3.5.
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    A Strategy To Improve The Quality Of The Electric Power Produced By A Wind Turbine Under Variable Speed Using A Proportional Resonant Controller
    (University of Eloued جامعة الوادي, 2016-05-01) Menga, F. D.; Djongyang, N.; Raïdandi, D.; Tchinda, R.; Zaatri, A.
    The wind power is well adapted nowadays as solution to the production of electricity or for mechanical use. But wind is a very fluctuating source of energy; it generates a non-permanent and variable power to the loads. This paper presents a strategy to improve the quality of the electric power produced by a wind turbine under variable speed. The mathematical modeling of the various elements of the conversion system is performed. Two control strategies are developed to improve the quality of the energy produced by the wind turbine. The first consists to a judicious management of the DC bus and the second to control the inverters with a corrective proportional resonant. The results obtained after implementation and simulation under Matlab/Simulink platform are presented.