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dc.contributor.advisorTorgersen, Jan
dc.contributor.advisorNydal, Ole Jørgen
dc.contributor.authorJohnsen, Håkon Jarand Dugstad
dc.date.accessioned2017-09-13T14:00:50Z
dc.date.available2017-09-13T14:00:50Z
dc.date.created2017-06-11
dc.date.issued2017
dc.identifierntnudaim:16788
dc.identifier.urihttp://hdl.handle.net/11250/2454573
dc.description.abstractSmall scale solar thermal energy devices such as solar cookers are promising solutions for remote areas where other energy sources are limited, for instance in developing countries. These devices can be used directly for cooking or for warming water. A successful application of these devices in developing countries requires them to be affordable, robust and easy to use. The use of traditional concentrator based solar cookers is complicated by the need to accurately rotate the large parabolic mirror for solar tracking. In this thesis, a workaround is demonstrated. Via beam-steering lens arrays, sunlight can be tracked with a simulated ≈70% efficiency across ±40° tracking range, using millimeter-scale lateral translation and introducing less than \pm2^{\circ} divergence to the beam. This eliminates the need to rotate the mirror, facilitating the design of a simpler cooker. Full-day cooking can be achieved by manually reorienting the cooker 1-2 times a day in the general direction of the sun. Accurate automated tracking is performed by small low-cost actuators, and additional features such as adjustable power level can also be implemented. The optical system was simulated and optimized using Zemax OpticStudio, and a functional 1:15 scale prototype has been constructed. The prototype demonstrates a promising total system efficiency of ≈20%, which is expected to rise to 50%-60% with improved manufacturing of the lens array and reflector. The lens array is assumed to be compatible with injection molding, enabling low-cost high-volume production. By enabling low-cost automatic tracking, this technology may facilitate inexpensive, maintainable and user-friendly solar cooking, fostering its increased adoption across the world. The beam-steering lens array represents developments that are applicable to the wider field of solar energy, with applications such as tracking for concentrator photovoltaic systems and solar lighting systems. A separate journal article has therefore been drafted documenting the development and performance of this technology.
dc.languageeng
dc.publisherNTNU
dc.subjectProduktutvikling og produksjon, Industriell mekanikk
dc.titleNovel Low Cost Solar Thermal Energy Concepts for Developing Countries
dc.typeMaster thesis


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