Analysis of the energetic feasibility of cylindro-parabolic collectors integrated in solar towers in Adrar area.

In solar energy, the cylindro-parabolic collector plays a capital role in the production of the high temperatures, great than 250°C. Being very robust and with a lifetime relatively rather long, the cylindro-parabolic collectors are used to produce the electricity in the solar towers in the Adrar area, in Algerian Sahara, witch characterized by a high density of sunning 71.259 KWh/m2.yr. In order to analyze its profitability, we proceeded to the mathematical modeling of the various elements of the cylindro-parabolic collector to lead to the advection equation by the recourse to the thermal balances in transient regime. A program, in language FORTRAN 90, was written to solve the system of algebraic equations system, deduced from the discretization method of the model equations. For one day typical and a volumetric flux of 0.6m3/h, the simulation results highlighted a significant profit in temperature at the level of the refrigerant which could reach 200°C. Also, it was highlighted the impact of the sunning intensity and the collector length on the absorber temperature, T1. The temperatures distributions in the absorber wall, T2, and that of the envelope in glass, T3, were calculated and we showed that its shape follows a Gaussian law whose the peak is reached in neighborhoods’ noon. Such a temperature has a consequence on the vapor production, with a pressure to 18 bars, capable to convey the turbine intended for generation of electricity. In addition, the program enabled us to examine the influence of the rate flow of refrigerant on the diurnal distribution of its temperature at outlet of the absorber tube.