The ‘Fresnel mirror’ type of CSP system is broadly similar to parabolic trough systems but instead of using trough-shaped mirrors that track the sun, it uses long flat mirrors at different angles that have the effect of focusing sunlight on one or more pipes containing heat-collecting fluid which are mounted above the mirrors. The mirrors change their orientation throughout the day so that sunlight is always concentrated on the heat-collecting pipe.
Originally, Fresnel systems were
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