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Browsing Han Publications by Author "Zwart, H.F. de"
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Up scaling and test results of an advanced Fresnel greenhouse 2012, Article / Letter to editor (Acta Horticulturae, iss. 952, (2012), pp. 531)A greenhouse with Fresnel lenses in the south facing roof and a receiver for concentrated Photovoltaics with water cooling (CPVT system) will result in electrical and thermal energy output from the solar energy excess entering a greenhouse. The PV system converts about half of the direct radiation into heat and electricity. During periods with direct radiation this will significantly reduce the heat load on the greenhouse. For an optimal performance the roof elements must be asymmetric with a steep inclination at the north side (the exact angle of course depends on the latitude of the building site). The Fresnel lens structure is best oriented in upwards direction. In the current design, two lenses are placed in the inner space of a double glass. This prevents pollution and condensation on the lenses. By the upward facing of the lens structure, the focus quality is preserved over a much broader range of angles of incidence compared to a lens with downward facing structures. Each PMMA lens with a size of 1.20×1.52 m is composed of 12 ‘tiles’ for easy production. The focal distance of the lens is 1,875 m and the geometrical concentration factor is 50×. This means that in most cases the focus line is thinner than 3 cm. The performance of the lens with respect to the shape of the focal area and the position of the focal line has been analyzed with ray tracing techniques. From this analyses and by the development of a smart tracking system only two motors can bring the receivers in the required positions. One motor controls the distance between lens and receiver and the other controls the translocation of the receivers parallel to the lens. The second conclusion was that the positions of the focal line are within the bounds of the greenhouse construction for almost the whole year. Only in winter, in the early morning and at the end of the day, the focal line will be unreachable. The 480 m2 greenhouse, with the LCPVT system based on Static Fresnel lenses and a 40 m CPVT-module and a 200 m CT-module, is designed by Bode Project Engineering and constructed by Technokas in Bleiswijk the Netherlands. -
Wastepaper Mining: a sustainable Goldmine 2009, Article in monograph or in proceedings (Proceedings of the 14th International Symposium on Logistics (14th ISL))In this research paper we want to explore a new way to handle recovered paper. The purpose of this paper is to understand the situation with China. Since years, this country is the most important market for recovered wastepaper collected in western countries from households. The efforts to get it there, necessitate an enormous number of transport movements, both within Europe and outwards to China and this number is growing exponentially. This paper is the result of a research of an alternative collecting and processing (The WastePaper Mining) concept, which will make a substantial contribution to reducing the number of transport movements and alleviating the pressure on infrastructure capacity. It will have potentially great implications for the collection and movement of recovered paper. On the balance that makes it possible to come a big step nearer to achieving sustainable logistics in the recovered paper sector.
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