A note on multiple reflections of radiation within CPCs and its effect on calculations of energy collection

作者：Tang Runsheng^*; Wang Jinfu

来源：Renewable Energy, 2013, 57: 490-496.

DOI：10.1016/j.renene.2013.02.010

• Compound parabolic concentrator
• Multi-reflection
• Optical efficiency factor
• Theoretical analysis
• Effect on calculations of energy collection

In this article, multi-reflection of radiation on both parabolic reflectors of CPC with one sided flat absorber and its effect on calculations of energy collection are theoretically investigated. Results show that, when a beam of radiation strikes on the aperture at incidence angle near zero, a considerable fraction of radiation will arrive on the absorber after more than two reflections, but the fraction of radiation that arrive the absorber after more than three reflections is considerably small. Comparative analysis of annual radiation collected by east-west oriented CPC based different reflection models indicates that the two-reflection model where more than three reflections are not considered can accurately estimate the annual collectible radiation, and for the case of CPCs with high reflectivity such as larger than 0.8 and larger acceptance angle such as larger than 20 degrees, the one-refection model where more than two reflections are not considered is acceptable to estimate annual radiation collected by CPC.

• 出版日期2013-9
• 单位云南师范大学