Fabrication of heterogeneous microlenses using self-surface tension

Cheng-Han Chiang; Guo-Dung J. Su

doi:10.1117/12.2061180

25 September 2014 Fabrication of heterogeneous microlenses using self-surface tension

Cheng-Han Chiang, Guo-Dung J. Su

Proceedings Volume 9192, Current Developments in Lens Design and Optical Engineering XV; 91920Y (2014) https://doi.org/10.1117/12.2061180
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

Solar optical modeling tools are valuable for modeling and predicting the performance of solar technology systems. Four optical modeling tools were evaluated using the National Solar Thermal Test Facility heliostat field combined with flat plate receiver geometry as a benchmark. The four optical modeling tools evaluated were DELSOL, HELIOS, SolTrace, and Tonatiuh. All are available for free from their respective developers. DELSOL and HELIOS both use a convolution of the sunshape and optical errors for rapid calculation of the incident irradiance profiles on the receiver surfaces. SolTrace and Tonatiuh use ray-tracing methods to intersect the reflected solar rays with the receiver surfaces and construct irradiance profiles. We found the ray-tracing tools, although slower in computation speed, to be more flexible for modeling complex receiver geometries, whereas DELSOL and HELIOS were limited to standard receiver geometries such as flat plate, cylinder, and cavity receivers. We also list the strengths and deficiencies of the tools to show tool preference depending on the modeling and design needs. We provide an example of using SolTrace for modeling nonconventional receiver geometries. The goal is to transfer the irradiance profiles on the receiver surfaces calculated in an optical code to a computational fluid dynamics code such as ANSYS Fluent. This approach eliminates the need for using discrete ordinance or discrete radiation transfer models, which are computationally intensive, within the CFD code. The irradiance profiles on the receiver surfaces then allows for thermal and fluid analysis on the receiver.

Citation Download Citation

Cheng-Han Chiang and Guo-Dung J. Su "Fabrication of heterogeneous microlenses using self-surface tension", Proc. SPIE 9192, Current Developments in Lens Design and Optical Engineering XV, 91920Y (25 September 2014); https://doi.org/10.1117/12.2061180

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KEYWORDS

Microlens

Light emitting diodes

Microlens array

Inkjet technology

Photoresist materials

Light sources

Receivers

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