Tracking-integrated optics: applications in solar concentration

Brian M Wheelwright; Roger Angel; Blake Coughenour

doi:10.1117/12.2074602

17 December 2014 Tracking-integrated optics: applications in solar concentration

Brian M Wheelwright, Roger Angel, Blake Coughenour

Proceedings Volume 9293, International Optical Design Conference 2014; 929315 (2014) https://doi.org/10.1117/12.2074602
Event: International Optical Design Conference, 2014, Kohala Coast, Hawaii, United States

Abstract

Conventional concentrating photovoltaic (CPV) systems track the sun with high precision dual-axis trackers. The emergent field of tracking-integrated optics has the potential to simplify the mechanics of CPV systems by loosening or eliminating the need for dual-axis tracking. In a tracking-integrated scheme, external module tracking is complemented or entirely replaced by miniature tracking within the module. This internal tracking-integration may take the form of active small-motion translation, rotation of arrayed optics, or by passive material property changes induced by the concentrated light. These methods are briefly reviewed. An insolation weighting model is presented which will aid in the design of tracking-integrated optics by quantifying the tradeoff between angular operation range and annual sunlight collection. We demonstrate that when tracking-integrated optics are used to complement external module tracking about a horizontal, North-South oriented axis, truncating the operational range may be advantageous. At Tucson AZ latitude (32.2°N), 15.6% of the angular range may be truncated while only sacrificing 3.6% of the annual insolation. We show that modules tracked about a polar-aligned axis are poorly-suited for truncation.

Citation Download Citation

Brian M Wheelwright, Roger Angel, and Blake Coughenour "Tracking-integrated optics: applications in solar concentration", Proc. SPIE 9293, International Optical Design Conference 2014, 929315 (17 December 2014); https://doi.org/10.1117/12.2074602

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