Análise da eficiência de um coletor solar plano
Water heating through electric showers consumes a significant portion of electricity in Brazil. In order to minimize the consumption of electrical energy to heat water for domestic use, the solar collectors become an important alternative, because they use the solar irradiance as an energy source wh...
| Principais autores: | Carvalho, Filipe Rocha de, Sionek, Mirella Cristina |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/10355 |
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| Resumo: |
Water heating through electric showers consumes a significant portion of electricity in Brazil. In order to minimize the consumption of electrical energy to heat water for domestic use, the solar collectors become an important alternative, because they use the solar irradiance as an energy source which is considered as clean and renewable energy. Among the solar collectors there are the flat-plate collectors, they collect the solar irradiance in the absorber plate and transfer this energy, in the form of heat, to the working fluid (in this case water) inside the tubes. The present work aims to develop a theoretical and experimental methodology to the study of this type of solar collectors. This requires the determination of the thermal efficiency of the solar collector. This assessment takes into account various geometric parameters and thermophysical properties of working fluid and the material of the solar collector (useful energy, collector area and total incident irradiation heat flow). For the mathematical model were used two methods: the method of equivalent thermal resistances and the method based on empirical correlations. The mathematical models were implemented in the software EES (Engineering Equation Solver). A theoretical analysis was first simulated using data from the literature and the speed of the wind provided by SIMEPAR/Paraná/Brazil. After that, experimental tests were carried out on a flat-plate collector with an area of 1 m2 with 10 copper tubes. Finally, an experimental theoretical analysis was performed based on theoretical models and experimental results were compared with the theoretical results. The theoretical results show a variation lower than 5% in efficiency compared to experimental ones, therefore showing a good approximation. |
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