Fresnel-type Reflector for Cheap Lattice Solar Power Concentrator
Posted by keelynet on July 7, 2008
These could be stamped out by the hundreds of thousands by an enterprising company.
“A subject of the invention is lattice type base for Fresnel reflector, and the said lattice comprises orthogonal crossed metal (e.g. steel) strips, while vertical strips are fixed anyway in the projected position after inserting its spike at its narrow edge into a slot of a spindle of a vertically tracing servomotor of the said SPC, and afterwards all horizontal strips could be fixed by simple inserting slot-into-slot to the said vertical strips. Thin aluminium reflecting mirrors are forming the said Fresnel reflector by simple inserting of the said mirrors into additional slots along the said horizontal strips. Such construction couldn’t be self-disintegrated, because it always looks upward when assembled and looks above horizontal area while operating. Such construction has very few dimension-types & ultra-lightweight details could be produced even if at a primitive small workshop by simple pressing and punching from thin metallic strips of ordinary mass produced materials and could be quick assembled directly at the solar power plant deployment. – Source / More information about the incredible Fresnel reflectors – The very first design in this category came from Volunteers in Technical Assistance (VITA) in 1961 . Three to four rings of masonite (hardboard like material) were cut from a 4’ x 4’ sheet. Aluminized polyester was stuck to this. After which the rings were nailed to specially notched wooden reapers to form a Fresnel concentrator. VITA provided a template of these materials as it was a do-it-yourself project (VITA 1971). The cooking pot was supported on a rod projecting from the center. Adjustments, once in 30 minutes were considered sufficient. Ease of construction and focusing characteristics made this design better than the regular parabolic reflector (VITA 1961). Professor Garg, an Indian designer (Garg et al 1978), suggests further improvements by making the reflector with five to six rings.”
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