MULTILAYER REFLECTIVE COATING FOR SOLAR ENERGY CONCENTRATORS
The central objective of this work is determine the optimal parameters for the preparation of compound mirrors of first surface of high reflectance by the magnetron sputtering method that will have a direct application in parabolic trough solar concentrators to use in a hybrid solar-geothermal Geothermal Plant at Cerro Prieto, located to the South-eastern of Mexicali City at the Northwest of México 1. The objective of the development of these mirrors is to have a mean life longer, at least 20 years. In order to obtain a high quality and resistant reflective surfaces for solar energy concentrators, it was necessary to evaporate a system on sheets of commercial glass. At the beginning a single system (Al, Al/SiO2) was developed, however the aggressive environment at the Geothermal Plant that includes wind, sand and corrosive gases that produce erosion and corrosion, and therefore degradation of the reflective coatings 1. As a solution a dual system, Al/SiO2/Al/SiO2 (compound mirror), was grown on the glass substrate by the magnetron sputtering method under initial high vacuum conditions to clean the chamber and acquire very low oxygen partial pressure. The dual system is full grown sequentially without break the vacuum, under these conditions allows to guarantee high quality thin films with full adherence 7. In this work we present the manufacture conditions, procedures and characterization of the system. It is important to mention that although the solar- geothermal hybrid system already has been proposed previously, this is the first time that sets out to generate electrical energy. By proposals like this one, it is considered that the work is extremely innovating mainly in the technological part and the fact that contributes to a new infrastructure, with an additional number of applications as much for the industry as for teaching.
Perla Hern(a)ndez Hector Cruz-Manjarrez Rafael Almanza
Instituto de Ingeniería, Instituto de Física Universidad Nacional Autónoma de México Apartado Postal 20-364 México 01000 DF
国际会议
2007世界太阳能大会(Proceedings of ISES Solar World Congress 2007)
北京
英文
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）