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Energia termossolar como alternativa na geração de vapor e água quente no setor agroindustrial

  • Guadalupe Almeida, Teresa Estefanía
Publication Date
Sep 22, 2018
Repositório Institucional da UFSC
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Abstract : In the last years, important attention has been given to the development and utilization of new technologies for energy generation, focused on the use of renewable sources. In this scenario, the technical and economic viability about the use of a Fresnel solar field and a plate collectors solar field, were evaluated to supply partially the demands of saturated steam and hot water of slaughterhouses. The present study was carried out in partnership with an agroindustrial company located in the west of Parana state. The studied plant is equipped with a biomass steam generation system (Eucalyptus wood chips) with a nominal capacity of 40 t/h of saturated steam at 9 bar (effective). As a first step, field data collection and subsequent calculation of the thermal efficiency of the steam generation system under partial load conditions were performed for several points of steam demand. Afterwards, it was proposed to install a Fresnel solar field in parallel with the boiler to promote biomass saving during the sunny hours. In this regard, three aperture areas of mirrors were analyzed, allowing the annual biomass economy between 1431 t to 7157 t. The flat plate collectors solar field, in turn, was designed to heat 100 m3/h of water in the design point, reducing the saturated steam demand supplied by the boiler. The collectors aperture area allows an annual biomass saving of 1486 t. The economic feasibility analysis of the projects was carried out by calculating the parameters Internal Rate of Return (IRR), Net Present Value (NPV) and payback time. With respect to economy and solar share, the Fresnel technology provided the most promising results. Nevertheless, the high prices associated with Fresnel concentrators turned the studied scenarios not feasible. In the other hand, more attractive results in terms of economic viability, were obtained considering the application of flat plate collectors for hot water production, indicating the potential of this technology to be applied for partially supplying the thermal energy demand of slaughterhouses.

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