Rugate filters for evacuated thermal collectors: IR mirror for improvement of energy conversion efficiency

Daniela De Luca; David Kortge; Peter Bermel; Emiliano Di Gennaro; Roberto Russo

doi:10.1117/12.2594497

5 August 2021 Rugate filters for evacuated thermal collectors: IR mirror for improvement of energy conversion efficiency

Daniela De Luca, David Kortge, Peter Bermel, Emiliano Di Gennaro, Roberto Russo

Author Affiliations +

Proceedings Volume 11824, New Concepts in Solar and Thermal Radiation Conversion IV; 118240A (2021) https://doi.org/10.1117/12.2594497
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Solar thermal absorbers lose an increasing amount of heat at higher operating temperatures, limiting their efficiencies. An infrared mirror characterized by a high transmittance in the visible region of the spectrum while having high reflectance in the mid-IR could be crucial for a partial recovery of heat radiated by absorbers operating at high temperatures. Thanks to the cold-side external photon recycling mechanism, an IR mirror applied to an evacuated collector could lead to increase in efficiency of up to 60%. Here, we demonstrate the feasibility of such a mirror, which in principle is developed for high-vacuum flat solar thermal collectors, but is easily adaptable to other applications. The mirror presented has a very simple design, based on a discrete rugate filter scheme, and does not require multi-cathode deposition tools, which further simplifies the manufacturing process.

Conference Presentation

Citation Download Citation

Daniela De Luca, David Kortge, Peter Bermel, Emiliano Di Gennaro, and Roberto Russo "Rugate filters for evacuated thermal collectors: IR mirror for improvement of energy conversion efficiency", Proc. SPIE 11824, New Concepts in Solar and Thermal Radiation Conversion IV, 118240A (5 August 2021); https://doi.org/10.1117/12.2594497

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