volume-04-Issue 2 (2012)
The Role of Mathematical Modeling in Understanding the Groundwater Pollution
IJTEE, volume-04, Issue 2 (2012) , PP 171 - 176
Published: 20 Apr 2012
by Fathi M Allan, Emad Elnajjar from Department of Mathematical Sciences, UAEU, AL AIN, UAEU, Department of Mechanical engineering, UAEU, AL AIN, UAEU
Abstract: To understand the process of groundwater contamination diffusion and spreading, mathematical model is usually used. In the present study, a mathematical model based on the transport diffusion will be discussed. The equation is governed by several parameters including the water velocity, permeability and diffusion rate. Fourier transform is employed to obtain the exact solution of the problem. The mathematical model will be totally analysed, programmed and tested using values for the parameters that simulate the actual data. Results suggests the model can bring some insights about the diffusion of the water contaminants as time progress from few days to hundreds of days. read more... read less...
Keywords: Mathematical modeling, underground water pollution, transport equation
Energy Tri-Generation: Combined Gas Cogeneration/Solar Cooling
IJTEE, volume-04, Issue 2 (2012) , PP 157 - 163
Published: 20 Apr 2012
by R. Benelmir, A. Merabtine, D. Descieux from Lorraine Univ. – Fac. Sc. Tech. - LERMAB, Vandoeuvre-les-Nancy, France
Abstract: The article presents an analysis of a tri-generation system using a solar energy as primary energy to provide a reliable alternative to minimize energy consumption in countries with a large solar field as the MENA region. At the University of Nancy, within the faculty of Sciences and Technologies, we are experimenting energy tri-generation through solar cooling of water for air-conditioning and heat/electricity cogeneration using gas fuelled internal combustion engine. The technology used for refrigeration is combined thermal solar-adsorption cooling. The physical principle of an adsorption based refrigerating machine is in some respect similar to the operating principle of a conventional compression based refrigerating machine [1-4]. Both systems rely on a “condenser - expansion valve – evaporator” refrigerant cycle. However, the way the two systems achieve refrigerant’s vapor compression is quite different. While the conventional machine provides a “mechanical” compression of the refrigerant’s vapor (standard refrigerant), the sorption machine achieves rather a “thermal” compression of the refrigerant’s vapor (water) in two steps: in the first stage, the vapor issue from the evaporator is assimilated within a solid adsorbent (silica gel) by rejecting heat; in the second stage, this vapor is resituated back to the system loop at high pressure due to solar heat input through an intermediary fluid (water). read more... read less...
Keywords: Lorraine Univ. – Fac. Sc. Tech. - LERMAB, Vandoeuvre-les-Nancy, France