Solar compound parabolic concentrator （CPC） has the characteristics of no need for real-time tracking, adjustable acceptance half-angle, and simultaneous receiving of beam and diffuse radiation, however, conventional CPC concentrating surfaces are not easy to produce, transport, install, and maintain. Therefore, in this research, a congruent multi-section asymmetric CPC （MA-CPC） is novelty constructed and its structural characteristics, concentrating properties and economic feasibility are explored. Based on the congruent concentrating plane technology, and coupled with 3D printing manufacturing technology, plane concentrating mirrors and solar vacuum tubes to construct a solar MA-CPC experimental setup, the reliability of the concentrating characteristics of MA-CPC is verified using laser experiments. Following this, the optical efficiency, solar radiation collection, concentrating uniformity and economic efficiency characteristics of the MA-CPC system are analyzed and discussed. It is found that solar MA-CPC can achieve higher collection of radiant energy in the autumn and winter seasons, and the solar radiation gathered to the absorber surface has better uniformity than the same size N-CPC. The results also show that the constructed solar MA-CPC has a significant advantage over N-CPC in terms of annual radiant energy output for the same investment, and has potential engineering applications.
Key words
solar energy /
compound parabolic concentrator /
asymmetric /
optical property /
solar thermal conversion /
performance evaluation
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