System development and studies on utilization of concentrated solar beam radiation for polymer processing
Stoynov, Lou A. (2006) System development and studies on utilization of concentrated solar beam radiation for polymer processing. PhD thesis, Queensland University of Technology.
Various solar energy technologies are being developed to harness the available
environmentally friendly and sustainable solar radiation. New ways of utilizing this
"free" power for different energy consuming processes continue to be created. In
this thesis, a multi-stage solar energy concentrating system has been developed and
its feasibility as a radiation source for polymer processing has been explored. The
solar energy concentrator (SEC) facility comprises a modified Cassegrainian
configuration combined with auxiliary imaging and non-imaging optics, serving as
an alternative energy source for polymer joining, ageing and adhesive curing.
Modeling and improvement of various aspects of the operation and performance of the SEC facility have been implemented. Optical ray tracing models of the Cassegrainian concentrator with various conventional imaging components and nonimaging
concentrators have been created to optimize the optical layout and system efficiency. On their basis, combined 3D ray tracing computer models integrated with
the mechanical components have been developed to simulate the entire SEC facility and predict the image size, location and orientation. Additionally, the energy transfer, radiation absorption and heat generation and transfer in the irradiated polymer have been modeled in order to study the radiation-polymer interaction.
One novel contribution of this research is the enhancement of the image forming concentrator with non-imaging cone-like concentrators (conical and compound
parabolic concentrator (CPC)), utilizing their inherent disadvantage of excessive
length. Compared to the refractive type means of transmitting concentrated solar
radiation, the truncated cone and CPC concentrators have been found more efficient
enhancing further the concentration and widening the utilized spectral range.
The experimental studies have demonstrated that transparent and colored, similar and dissimilar polymers can be successfully joined using the SEC facility.
The especially developed through-transmission technique removes the need to use a special absorbing medium of the radiant energy required by current advanced welding techniques. The tensile strengths of the joints achieved are comparable to those achieved for similar polymers with other advanced plastic joining methods.
The results from the polymer ageing experiments have shown that ultraaccelerated
exposure to concentrated sunlight can be performed with the SEC facility without introducing spurious failure mechanisms. Based on the preliminary investigation on adhesive curing utilizing concentrated solar radiation, it has been concluded that with carefully chosen light-curing adhesives solar radiation can be a useful radiation source for adhesive curing.
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|Item Type:||QUT Thesis (PhD)|
|Supervisor:||Yarlagadda, Prasad& Bell, John|
|Keywords:||accelerated outdoor ageing, cassegrainian concentrator, solar radiation, thermoplastic joining|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
Past > Schools > School of Engineering Systems
|Department:||Faculty of Built Environment and Engineering|
|Institution:||Queensland University of Technology|
|Copyright Owner:||Copyright Lou A. Stoynov|
|Deposited On:||03 Dec 2008 13:58|
|Last Modified:||29 Oct 2011 05:44|
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