Nanotextured solar selective metallic surfaces for parabolic trough collector receivers

Date

2025-1

Author

Güner, Levent

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

129
views

78
downloads

Cite This

This thesis investigates the potential of replacing commercial solar selective coated receivers in PTC receivers with nanotextured metallic surfaces to reduce the complexity of the fabrication and enhance the feasibility of these receivers. Chromium and stainless steel are selected for their corrosion resistance and thermal stability. Optical parameters of these materials are obtained using Lorentz-Drude Theory, while Gaussian Random Surfaces (GRS) are used to generate nanotextured surfaces. Spectral reflectance spectra over UV-VIS-NIR and IR regions are modeled using the FDTD method to solve Maxwell’s Equations. The opto-thermal properties are derived from spectral reflectance data for each material-surface configuration and applied to a thermal model of the PTC receiver. Nanotextured Cr surfaces demonstrate high solar selectivity with solar absorptance (α_s) of 0.90 and thermal emittance (ε_th) of 0.12 at 400 °C. However, maximum thermal conversion efficiency (η_(th,c)) of 0.69 is achieved at α_s/ε_th = 0.94/0.18, only 2.8% lower than the commercial PTC receiver (0.71). In contrast, AISI 304 achieves similar absorptance (α_s = 0.94) but lower selectivity (ε_th = 0.29), resulting in η_(th,c) = 0.65.

Subject Keywords

FDTD, Gaussian random surfaces, Parabolic trough collector, Solar selective surface, Thermal modeling

URI

https://hdl.handle.net/11511/113502

Collections

Graduate School of Natural and Applied Sciences, Thesis