A new design method for compound parabolic concentrators by eliminating the secondary reflection

Mathematic models were set up for the compound parabolic concentrator (CPC), respectively without truncation, with half light truncation and with elimination of secondary reflection. According to ray tracing method and Monte Carlo method, and for the geometric concentrating ratio in the range of 2 to 10, the aspect ratio of CPC depth to outlet aperture width was calculated, and subsequently the CPC economy was analyzed, following which both the non-uniformity of concentrated light and the maximum irradiance on the best uniform surface were computed, so as to study the uniformity of the CPC. Results show that for the same geometric concentrating ratio, the newly designed CPC with elimination of secondary reflection has the best economy and the highest uniformity of concentrated light among all the three types of CPCs mentioned above.