Method for designing panel receiving type compound parabolic concentrator

Abstract

The invention discloses a method for designing a panel receiving type compound parabolic concentrator. The method comprises the steps that the emergent light hole width and the geometric concentrating ratio C[G] of the CPC are designed as needed, the incident light hole width = C[G] * , the height H[1], the daylighting half-angle theta, the focal length of a parabola , and the distance between the optimal uniform face B[1]F[1] and an emergent light hole of the CPC are calculated, and then, the geometric structure size of the CPC is determined. According to the method for designing the panel receiving type CPC, the height H[1] of the CPC can be greatly reduced, the light intensity uniformity, on the optimal uniform face B[1]F[1], of the CPC can be improved after condensation, and the economy and condensation performance of the CPC are improved.

Description

technical field [0001] The invention belongs to the technical field of low-power concentrating photovoltaics and photovoltaic photothermal comprehensive utilization, and relates to a design method for a line-condensing and symmetrically arranged flat-panel receiving compound parabolic concentrator, in particular to a planar receiving-type compound parabolic concentrator. design method. Background technique [0002] American scholar Winston invented the compound parabolic concentrator (CPC, Compound Parabolic Concentrator) based on the principle of maximum concentration. It was used for ray detection in high-energy physics experiments in the early days, and it began to be used in solar energy technology in 1974. CPC is a non-imaging concentrator designed according to the principle of edge optics. The characteristic of this concentrator is that, within the range of CPC acceptance angle, for any given acceptance angle, the largest thermodynamically possible concentration ratio ...

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Problems solved by technology

[0003] Applying CPC to low-power concentrating photovoltaics and comprehensive utilization of photovoltaics and heat can make good use of the advantages of CPC pointed out above. However, as the concentration ratio of CPC increases, the height of CPC will also increase significantly, which will lead to CPC The economy is significantly reduced, which increases the difficulty of CPC installation. Therefore, according to the characteristics of CPC, it is intercepted. The interception ratio of conventional intercepted CPC is between 2 / 3 and 1 / 2, which is considered ideal. Although this design method takes into account CPC is economical, but still sacrifices the concentration ratio of CPC, and the uniformity of light intensity after concentration cannot be guaranteed, resulting in the inability to be better applied to the fields of low-power concentrating photovoltaics and comprehensive utilization of photovoltaics and heat.

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