Desenvolvimento de transdutor LVDT e módulo de instrumentação para ajuste da posição de refletores em rastreadores solares
The main methods for generating solar energy, renewable and clean, are photovoltaic systems and solar thermal energy systems. A low-cost option due to the simplicity is the Fresnel Linear Reflector (LFR) technology this is one of the thermal systems that have room for improvement, and mechanisms for...
| Autor principal: | Pelegrin, Juliano de |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2021
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/25615 |
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| Resumo: |
The main methods for generating solar energy, renewable and clean, are photovoltaic systems and solar thermal energy systems. A low-cost option due to the simplicity is the Fresnel Linear Reflector (LFR) technology this is one of the thermal systems that have room for improvement, and mechanisms for solar tracking are used to increase the efficiency of these systems. This work proposes the instrumentation of a Linear Variable Differential Transformer, LVDT, to control the position in a solar tracking system applied in linear Fresnel reflectors. The LVDT can be used to control and adjust the angular position when the reflector is subjected to external disturbances. Also, the sensor can adjust position errors caused by inaccuracies in the mechanical structure of the tracking system. An LVDT is a simple and robust linear transducer. It can provide the position of reflectors in solar tracking systems. The development of a low-cost linear displacement sensor with digital communication interfaces to be applied to solar trackers was carried out. The transducer was built and, its instrumentation module was produced based on the Texas Instruments® PGA970 integrated circuit. The prototype characterization was carried out and, performance analysis was developed, allowing the detailing operation and performance of the linear displacement sensor. From the LVDT response, a calibration procedure became possible. The measurement results showed a measurement uncertainty of ± 0.0687mm for the entire measurement range and ± 0.0274mm in the region of better linearity. Finally, to validate the results, the proposed instrumentation was implemented in an LVDT transducer already characterized with another instrumentation module, obtaining an uncertainty five times lower, showing that the proposed instrumentation presented a good performance. |
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