Browsing by Author "Baba Ahmed, N."

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    Effect Of Gempehd Thermal Properties On The Propagation Of Heat In Solar Stills
    (University of Eloued جامعة الوادي, 2016-09-01) Baba Ahmed, N.; Benmoussat, A.; Aliane, K.
    The properties of GEMPEHD as an absorber material in a prototype of solar still have been investigated in a temperature range from 300 K to 400 K. Results showed a dependency between temperature and its properties. The enegy absorbed by the GEMPEHD increases its temperature, the power received by the air and the air temperature. Overall losses increase with the difference of the temperature between the GEMPEHD and windows. This increases the efficiency of the solar still and minimizes the entropy of the system. The study of thermal aging is dedicated to the interpretation of various analyses the GEMPEHD before and after its use in the solar still. The thermal aging GEMPEHD in the air is a physical loss and chemical consumption immediately followed by a brutal oxidation of the polymer. The losses would be governed primarily by the chemical consumption of antioxidants
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    Experimental Measurement, Analysis And Modelling Of Dependency Emissivity In Function Of Temperature
    (University of Eloued جامعة الوادي, 2010-01-01) Baba Ahmed, N.; Benmoussat, A.; Benouaz, T.
    We propose a direct method of measurement of the total emissivity of opaque samples on a range of temperature around the ambient one. The method rests on the modulation of the temperature of the sample and the infra-red signal processing resulting from the surface of the sample we model the total emissivity obtained in experiments according to the temperature to establish linear correlations. This leads us to apply the method of optimal linearization associated the finite element method with the nonlinear problem of transfer of heat if thermal conductivity, the specific heat and the emissivity of studied material depend on the temperature. We obtain a good agreement between the resolution of the nonlinear equation of heat and the results obtained by the experimentation.
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    Study On The Energetic Parameters In A Photothermic Sensor With Black Polymeric Film
    (University of Eloued جامعة الوادي, 2010-01-01) Benmoussat, A.; Baba Ahmed, N.; Ainad Tabet, S.; Belahcene, B.
    Renewable energies such as thermal solar energy are accessible energy hydrous for desalination water, recycling and hot water production. Heat is produced by greenhouse effect in the sensor. It is no polluting form of energy according to the sustainable development. In this paper the design of sensor photothermic prototype with polymeric film absorbing, the materials radiation properties, the analysis of different energy losses in the system and the energy balance will be presented. The evolution of incidental solar illumination on the horizontal plan of sensor and the temperature distribution are studied. Results showed that the temperature obtained by thermal conversion depends on the absorbing characteristics of the polymeric film, radiation intensity and time exposure