Does the enormous glass collector require cleaning?
No. The self-cleaning effect of the glass is sufficient to remove dust by rain or by wind. No cleaning was necessary at the pilot plant in Spain during nine years of service. The secret is that even muddy clay will brake up on the hot glass surface into very fine dust which is carried away by the slightest breeze. Earlier on an automatic sand removing device was contemplated by Prof. Schlaich for heavy sand storm areas but not pursued, since such areas can in general be avoided. This might change with GreenTowers in the Sahara.
