Design and feasibility testing of a high resolution, 3D printer using concentrated solar power

dc.contributor.authorBohmer, Thomas Simon
dc.contributor.authorSonnendecker, Paul Walter
dc.contributor.authorBadenhorst, Heinrich
dc.date.accessioned2019-08-13T09:57:45Z
dc.date.issued2019-06
dc.description.abstractAdditive manufacturing (3D printing), combined with computer aided design, is transforming the modern manufacturing industry. Using high temperature techniques such as “selective laser sintering”, fabricators are given access to a wide range of starting materials. The sustainability of the approach could be improved through the direct use of concentrated sunlight to sinter these powders. Using inexpensive components, the cost can also be decreased to enable utilization by microbusinesses, especially those operating in remote, off-grid locations. For achieving this goal a high resolution prototype has been developed and constructed using a Fresnel lens design. To determine the feasibility of the method, two dimensional sintering tests were conducted on a commercial Nylon 12 powder. The effects of the most influential parameters on this process were determined through the implementation of a simplified model and dimensional analysis. The most important parameter for the description of the process was found to be the dimensionless ratio of incoming radiative power to power required for sintering or melting. For conditions in which only a single phase transformation takes place, this parameter was found to remain constant, with a mean of 6.84 and variance of 0.04. The limits of the power to speed ratio were also determined, achieving thicknesses as low as 0.3 mm for the selected powder and lens combination. The measured parameters demonstrate the feasibility of high resolution 3D printing using the proposed technique, provided that tailored control strategies are developed. A major limitation was found to be the focal spot size of the lens, which determines the track width. This can be improved from the current value of 3 mm through the use of a cast glass lens.en_ZA
dc.description.departmentChemical Engineeringen_ZA
dc.description.embargo2020-06-01
dc.description.librarianhj2019en_ZA
dc.description.urihttp://www.elsevier.com/locate/soleneren_ZA
dc.identifier.citationBohmer, T.S., Sonnendecker, P.W. & Badenhorst, H. 2019, 'Design and feasibility testing of a high resolution, 3D printer using concentrated solar power', Solar Energy, vol. 185, pp. 13-23.en_ZA
dc.identifier.issn0038-092X
dc.identifier.other10.1016/j.solener.2019.04.022
dc.identifier.urihttp://hdl.handle.net/2263/71096
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2019 International Solar Energy Society. Published by Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Solar Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Solar Energy, vol. 185, pp. 13-23, 2019. doi : 10.1016/j.solener.2019.04.022.en_ZA
dc.subjectAdditive manufacturingen_ZA
dc.subjectConcentrated solar energyen_ZA
dc.subjectSelective sinteringen_ZA
dc.subjectMetal powdersen_ZA
dc.subjectHeat transferen_ZA
dc.subjectLaseren_ZA
dc.subjectTemperatureen_ZA
dc.subjectPredictionen_ZA
dc.subjectSelective laser sinteringen_ZA
dc.titleDesign and feasibility testing of a high resolution, 3D printer using concentrated solar poweren_ZA
dc.typePostprint Articleen_ZA

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