Optical analysis of a hemispheric concentrator with a manual tracking system for the declination

Abstract

We present in this paper, a craft prototype of a fixed hemispheric concentrator, built from small square mirrors with a moon crescent receiver. The position of the receiver is adjusted every three days taking into account the declination. This system achieves a geometric mean concentration of 122 and the experimental measurements lead to temperatures varying between 120°C and 260°C in the plan for the least diffusion. The proposed improvements should allow for more competitiveness and convenience than the Scheffler system with its electromechanical sun tracking.

Optical and Thermal Performance Analysis of a Steady Spherical Collector with a Crescent-shaped Rotating Absorber

“…This also had been studied by Kyet al, 2015 [3] who proposed the use of hemispherical concentrator to replace Scheffler systems. The geometric mean concentration of the hemispherical concentrator had been restudied to best locate the plan of the least diffusion and to determine the size of the cavity absorber to be disposed.…”