Analysis of the Energetic Feasibility of Parabolic Trough Collectors Integrated in Solar Towers in Adrar Area

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• 作者：Douani Mustapha ; Labbaci Abdallah ; Hadj Benaichouche Houria
• 关键词：Solar energy ; parabolic trough collector ; absorber ; heat balance ; finite differences.
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：36
• 期：Complete
• 页码：1085-1100
• 全文大小：506 K

文摘

In solar energy, the parabolic trough collector plays a capital role in the production of the high temperatures, great than 250 ¡ãC. Being very robust and with a lifetime relatively rather long, the parabolic trough 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 parabolic trough 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 0.6m/h, the simulation results highlighted a significant profit in temperature at the level of the refrigerant which could reach 200 ¡ãC. 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.