Optimum design of wideband selective absorbers with provision for specified included layers |
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Authors: | B. S. Thornton Q. M. Tran |
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Affiliation: | Foundation for Australian Resources, School of Mathematical Sciences, New South Wales Institute of Technology, New South Wales, Australia |
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Abstract: | A method is described for optimising the design of a selective solar absorbing multilayer on a reflective substrate whose effective surface impedance can be specified. Provision is made for up to two layers to be specified to suit possible special physical requirements and for absorption grading with depth through the multilayer.The concept of maximum power transfer expressed in terms of “reflection loss” from selectivity theory in multisection transmission lines is used instead of the reflection coefficients. This enables formulation as a non-linear constrained optimisation problem. Computational results show that good performance may require non standard materials and also show the importance of controlling the substrate surface impedance perhaps by surface roughness. The latter effect has been shown in recent separate experimental results. |
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