| 摘要 |
<p>A non-imaging optical system (20) for operating on light using broken symmetry reflector surfaces (24, 26). The theoretical upper limit for concentration of direct solar radiation at low latitudes with stationary concentrators is determined from the projected solid angle sampled by the apparent motion of the sun. Based on the fact that the solar radiation is not uniformly distributed within this projected solid angle, we derive higher concentrations which apply when rejecting the lower density radiation. Trough type systems, which have translational symmetry, cannot be ideal stationary concentrators. Efficiency (Figs. 6, 7, 9) is improved by using broken symmetry for surfaces of the reflector and the light source or concentrator. We note that what applies to concentrators applies equally to reflectors for illumination.</p> |
